mirror of
https://sourceware.org/git/binutils-gdb.git
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68cffbbd44
Teach GDB how to dump memory tags for AArch64 when using the gcore command and how to read memory tag data back from a core file generated by GDB (via gcore) or by the Linux kernel. The format is documented in the Linux Kernel documentation [1]. Each tagged memory range (listed in /proc/<pid>/smaps) gets dumped to its own PT_AARCH64_MEMTAG_MTE segment. A section named ".memtag" is created for each of those segments when reading the core file back. To save a little bit of space, given MTE tags only take 4 bits, the memory tags are stored packed as 2 tags per byte. When reading the data back, the tags are unpacked. I've added a new testcase to exercise the feature. Build-tested with --enable-targets=all and regression tested on aarch64-linux Ubuntu 20.04. [1] Documentation/arm64/memory-tagging-extension.rst (Core Dump Support)
1329 lines
38 KiB
C
1329 lines
38 KiB
C
/* Core dump and executable file functions below target vector, for GDB.
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Copyright (C) 1986-2022 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 "arch-utils.h"
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#include <signal.h>
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#include <fcntl.h>
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "infrun.h"
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#include "symtab.h"
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#include "command.h"
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#include "bfd.h"
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#include "target.h"
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#include "process-stratum-target.h"
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#include "gdbcore.h"
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#include "gdbthread.h"
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#include "regcache.h"
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#include "regset.h"
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#include "symfile.h"
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#include "exec.h"
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#include "readline/tilde.h"
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#include "solib.h"
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#include "solist.h"
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#include "filenames.h"
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#include "progspace.h"
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#include "objfiles.h"
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#include "gdb_bfd.h"
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#include "completer.h"
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#include "gdbsupport/filestuff.h"
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#include "build-id.h"
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#include "gdbsupport/pathstuff.h"
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#include "gdbsupport/scoped_fd.h"
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#include "debuginfod-support.h"
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#include <unordered_map>
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#include <unordered_set>
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#include "gdbcmd.h"
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#include "xml-tdesc.h"
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#include "memtag.h"
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif
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/* The core file target. */
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static const target_info core_target_info = {
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"core",
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N_("Local core dump file"),
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N_("Use a core file as a target.\n\
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Specify the filename of the core file.")
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};
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class core_target final : public process_stratum_target
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{
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public:
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core_target ();
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const target_info &info () const override
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{ return core_target_info; }
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void close () override;
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void detach (inferior *, int) override;
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void fetch_registers (struct regcache *, int) override;
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enum target_xfer_status xfer_partial (enum target_object object,
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const char *annex,
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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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void files_info () override;
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bool thread_alive (ptid_t ptid) override;
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const struct target_desc *read_description () override;
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std::string pid_to_str (ptid_t) override;
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const char *thread_name (struct thread_info *) override;
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bool has_all_memory () override { return true; }
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bool has_memory () override;
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bool has_stack () override;
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bool has_registers () override;
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bool has_execution (inferior *inf) override { return false; }
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bool info_proc (const char *, enum info_proc_what) override;
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bool supports_memory_tagging () override;
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/* Core file implementation of fetch_memtags. Fetch the memory tags from
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core file notes. */
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bool fetch_memtags (CORE_ADDR address, size_t len,
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gdb::byte_vector &tags, int type) override;
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/* A few helpers. */
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/* Getter, see variable definition. */
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struct gdbarch *core_gdbarch ()
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{
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return m_core_gdbarch;
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}
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/* See definition. */
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void get_core_register_section (struct regcache *regcache,
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const struct regset *regset,
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const char *name,
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int section_min_size,
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const char *human_name,
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bool required);
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/* See definition. */
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void info_proc_mappings (struct gdbarch *gdbarch);
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private: /* per-core data */
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/* Get rid of the core inferior. */
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void clear_core ();
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/* The core's section table. Note that these target sections are
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*not* mapped in the current address spaces' set of target
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sections --- those should come only from pure executable or
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shared library bfds. The core bfd sections are an implementation
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detail of the core target, just like ptrace is for unix child
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targets. */
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target_section_table m_core_section_table;
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/* File-backed address space mappings: some core files include
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information about memory mapped files. */
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target_section_table m_core_file_mappings;
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/* Unavailable mappings. These correspond to pathnames which either
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weren't found or could not be opened. Knowing these addresses can
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still be useful. */
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std::vector<mem_range> m_core_unavailable_mappings;
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/* Build m_core_file_mappings. Called from the constructor. */
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void build_file_mappings ();
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/* Helper method for xfer_partial. */
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enum target_xfer_status xfer_memory_via_mappings (gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset,
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ULONGEST len,
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ULONGEST *xfered_len);
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/* FIXME: kettenis/20031023: Eventually this field should
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disappear. */
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struct gdbarch *m_core_gdbarch = NULL;
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};
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core_target::core_target ()
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{
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/* Find a first arch based on the BFD. We need the initial gdbarch so
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we can setup the hooks to find a target description. */
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m_core_gdbarch = gdbarch_from_bfd (core_bfd);
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/* If the arch is able to read a target description from the core, it
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could yield a more specific gdbarch. */
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const struct target_desc *tdesc = read_description ();
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if (tdesc != nullptr)
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{
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struct gdbarch_info info;
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info.abfd = core_bfd;
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info.target_desc = tdesc;
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m_core_gdbarch = gdbarch_find_by_info (info);
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}
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if (!m_core_gdbarch
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|| !gdbarch_iterate_over_regset_sections_p (m_core_gdbarch))
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error (_("\"%s\": Core file format not supported"),
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bfd_get_filename (core_bfd));
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/* Find the data section */
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m_core_section_table = build_section_table (core_bfd);
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build_file_mappings ();
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}
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/* Construct the target_section_table for file-backed mappings if
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they exist.
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For each unique path in the note, we'll open a BFD with a bfd
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target of "binary". This is an unstructured bfd target upon which
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we'll impose a structure from the mappings in the architecture-specific
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mappings note. A BFD section is allocated and initialized for each
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file-backed mapping.
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We take care to not share already open bfds with other parts of
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GDB; in particular, we don't want to add new sections to existing
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BFDs. We do, however, ensure that the BFDs that we allocate here
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will go away (be deallocated) when the core target is detached. */
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void
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core_target::build_file_mappings ()
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{
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std::unordered_map<std::string, struct bfd *> bfd_map;
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std::unordered_set<std::string> unavailable_paths;
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/* See linux_read_core_file_mappings() in linux-tdep.c for an example
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read_core_file_mappings method. */
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gdbarch_read_core_file_mappings (m_core_gdbarch, core_bfd,
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/* After determining the number of mappings, read_core_file_mappings
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will invoke this lambda. */
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[&] (ULONGEST)
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{
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},
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/* read_core_file_mappings will invoke this lambda for each mapping
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that it finds. */
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[&] (int num, ULONGEST start, ULONGEST end, ULONGEST file_ofs,
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const char *filename, const bfd_build_id *build_id)
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{
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/* Architecture-specific read_core_mapping methods are expected to
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weed out non-file-backed mappings. */
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gdb_assert (filename != nullptr);
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struct bfd *bfd = bfd_map[filename];
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if (bfd == nullptr)
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{
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/* Use exec_file_find() to do sysroot expansion. It'll
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also strip the potential sysroot "target:" prefix. If
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there is no sysroot, an equivalent (possibly more
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canonical) pathname will be provided. */
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gdb::unique_xmalloc_ptr<char> expanded_fname
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= exec_file_find (filename, NULL);
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if (expanded_fname == nullptr && build_id != nullptr)
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debuginfod_exec_query (build_id->data, build_id->size,
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filename, &expanded_fname);
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if (expanded_fname == nullptr)
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{
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m_core_unavailable_mappings.emplace_back (start, end - start);
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/* Print just one warning per path. */
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if (unavailable_paths.insert (filename).second)
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warning (_("Can't open file %s during file-backed mapping "
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"note processing"),
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filename);
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return;
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}
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bfd = bfd_map[filename] = bfd_openr (expanded_fname.get (),
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"binary");
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if (bfd == nullptr || !bfd_check_format (bfd, bfd_object))
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{
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m_core_unavailable_mappings.emplace_back (start, end - start);
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/* If we get here, there's a good chance that it's due to
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an internal error. We issue a warning instead of an
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internal error because of the possibility that the
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file was removed in between checking for its
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existence during the expansion in exec_file_find()
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and the calls to bfd_openr() / bfd_check_format().
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Output both the path from the core file note along
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with its expansion to make debugging this problem
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easier. */
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warning (_("Can't open file %s which was expanded to %s "
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"during file-backed mapping note processing"),
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filename, expanded_fname.get ());
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if (bfd != nullptr)
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bfd_close (bfd);
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return;
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}
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/* Ensure that the bfd will be closed when core_bfd is closed.
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This can be checked before/after a core file detach via
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"maint info bfds". */
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gdb_bfd_record_inclusion (core_bfd, bfd);
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}
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/* Make new BFD section. All sections have the same name,
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which is permitted by bfd_make_section_anyway(). */
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asection *sec = bfd_make_section_anyway (bfd, "load");
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if (sec == nullptr)
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error (_("Can't make section"));
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sec->filepos = file_ofs;
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bfd_set_section_flags (sec, SEC_READONLY | SEC_HAS_CONTENTS);
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bfd_set_section_size (sec, end - start);
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bfd_set_section_vma (sec, start);
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bfd_set_section_lma (sec, start);
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bfd_set_section_alignment (sec, 2);
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/* Set target_section fields. */
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m_core_file_mappings.emplace_back (start, end, sec);
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/* If this is a bfd of a shared library, record its soname
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and build id. */
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if (build_id != nullptr)
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{
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gdb::unique_xmalloc_ptr<char> soname
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= gdb_bfd_read_elf_soname (bfd->filename);
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if (soname != nullptr)
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set_cbfd_soname_build_id (current_program_space->cbfd,
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soname.get (), build_id);
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}
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});
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normalize_mem_ranges (&m_core_unavailable_mappings);
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}
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/* An arbitrary identifier for the core inferior. */
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#define CORELOW_PID 1
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void
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core_target::clear_core ()
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{
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if (core_bfd)
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{
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switch_to_no_thread (); /* Avoid confusion from thread
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stuff. */
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exit_inferior_silent (current_inferior ());
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/* Clear out solib state while the bfd is still open. See
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comments in clear_solib in solib.c. */
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clear_solib ();
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current_program_space->cbfd.reset (nullptr);
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}
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}
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/* Close the core target. */
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void
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core_target::close ()
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{
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clear_core ();
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/* Core targets are heap-allocated (see core_target_open), so here
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we delete ourselves. */
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delete this;
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}
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/* Look for sections whose names start with `.reg/' so that we can
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extract the list of threads in a core file. */
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static void
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add_to_thread_list (asection *asect, asection *reg_sect)
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{
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int core_tid;
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int pid, lwpid;
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bool fake_pid_p = false;
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struct inferior *inf;
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if (!startswith (bfd_section_name (asect), ".reg/"))
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return;
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core_tid = atoi (bfd_section_name (asect) + 5);
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pid = bfd_core_file_pid (core_bfd);
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if (pid == 0)
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{
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fake_pid_p = true;
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pid = CORELOW_PID;
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}
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lwpid = core_tid;
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inf = current_inferior ();
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if (inf->pid == 0)
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{
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inferior_appeared (inf, pid);
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inf->fake_pid_p = fake_pid_p;
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}
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ptid_t ptid (pid, lwpid);
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thread_info *thr = add_thread (inf->process_target (), ptid);
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/* Warning, Will Robinson, looking at BFD private data! */
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if (reg_sect != NULL
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&& asect->filepos == reg_sect->filepos) /* Did we find .reg? */
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switch_to_thread (thr); /* Yes, make it current. */
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}
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/* Issue a message saying we have no core to debug, if FROM_TTY. */
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static void
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maybe_say_no_core_file_now (int from_tty)
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{
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if (from_tty)
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gdb_printf (_("No core file now.\n"));
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}
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/* Backward compatibility with old way of specifying core files. */
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void
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core_file_command (const char *filename, int from_tty)
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{
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dont_repeat (); /* Either way, seems bogus. */
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if (filename == NULL)
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{
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if (core_bfd != NULL)
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{
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target_detach (current_inferior (), from_tty);
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gdb_assert (core_bfd == NULL);
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}
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else
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maybe_say_no_core_file_now (from_tty);
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}
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else
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core_target_open (filename, from_tty);
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}
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|
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/* Locate (and load) an executable file (and symbols) given the core file
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BFD ABFD. */
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||
static void
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locate_exec_from_corefile_build_id (bfd *abfd, int from_tty)
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||
{
|
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const bfd_build_id *build_id = build_id_bfd_get (abfd);
|
||
if (build_id == nullptr)
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return;
|
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|
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gdb_bfd_ref_ptr execbfd
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= build_id_to_exec_bfd (build_id->size, build_id->data);
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||
|
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if (execbfd == nullptr)
|
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{
|
||
/* Attempt to query debuginfod for the executable. */
|
||
gdb::unique_xmalloc_ptr<char> execpath;
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scoped_fd fd = debuginfod_exec_query (build_id->data, build_id->size,
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abfd->filename, &execpath);
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||
|
||
if (fd.get () >= 0)
|
||
{
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||
execbfd = gdb_bfd_open (execpath.get (), gnutarget);
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||
|
||
if (execbfd == nullptr)
|
||
warning (_("\"%s\" from debuginfod cannot be opened as bfd: %s"),
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||
execpath.get (),
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gdb_bfd_errmsg (bfd_get_error (), nullptr).c_str ());
|
||
else if (!build_id_verify (execbfd.get (), build_id->size,
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||
build_id->data))
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||
execbfd.reset (nullptr);
|
||
}
|
||
}
|
||
|
||
if (execbfd != nullptr)
|
||
{
|
||
exec_file_attach (bfd_get_filename (execbfd.get ()), from_tty);
|
||
symbol_file_add_main (bfd_get_filename (execbfd.get ()),
|
||
symfile_add_flag (from_tty ? SYMFILE_VERBOSE : 0));
|
||
}
|
||
}
|
||
|
||
/* See gdbcore.h. */
|
||
|
||
void
|
||
core_target_open (const char *arg, int from_tty)
|
||
{
|
||
const char *p;
|
||
int siggy;
|
||
int scratch_chan;
|
||
int flags;
|
||
|
||
target_preopen (from_tty);
|
||
if (!arg)
|
||
{
|
||
if (core_bfd)
|
||
error (_("No core file specified. (Use `detach' "
|
||
"to stop debugging a core file.)"));
|
||
else
|
||
error (_("No core file specified."));
|
||
}
|
||
|
||
gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg));
|
||
if (strlen (filename.get ()) != 0
|
||
&& !IS_ABSOLUTE_PATH (filename.get ()))
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||
filename = make_unique_xstrdup (gdb_abspath (filename.get ()).c_str ());
|
||
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||
flags = O_BINARY | O_LARGEFILE;
|
||
if (write_files)
|
||
flags |= O_RDWR;
|
||
else
|
||
flags |= O_RDONLY;
|
||
scratch_chan = gdb_open_cloexec (filename.get (), flags, 0).release ();
|
||
if (scratch_chan < 0)
|
||
perror_with_name (filename.get ());
|
||
|
||
gdb_bfd_ref_ptr temp_bfd (gdb_bfd_fopen (filename.get (), gnutarget,
|
||
write_files ? FOPEN_RUB : FOPEN_RB,
|
||
scratch_chan));
|
||
if (temp_bfd == NULL)
|
||
perror_with_name (filename.get ());
|
||
|
||
if (!bfd_check_format (temp_bfd.get (), bfd_core))
|
||
{
|
||
/* Do it after the err msg */
|
||
/* FIXME: should be checking for errors from bfd_close (for one
|
||
thing, on error it does not free all the storage associated
|
||
with the bfd). */
|
||
error (_("\"%s\" is not a core dump: %s"),
|
||
filename.get (), bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
|
||
current_program_space->cbfd = std::move (temp_bfd);
|
||
|
||
core_target *target = new core_target ();
|
||
|
||
/* Own the target until it is successfully pushed. */
|
||
target_ops_up target_holder (target);
|
||
|
||
validate_files ();
|
||
|
||
/* If we have no exec file, try to set the architecture from the
|
||
core file. We don't do this unconditionally since an exec file
|
||
typically contains more information that helps us determine the
|
||
architecture than a core file. */
|
||
if (!current_program_space->exec_bfd ())
|
||
set_gdbarch_from_file (core_bfd);
|
||
|
||
current_inferior ()->push_target (std::move (target_holder));
|
||
|
||
switch_to_no_thread ();
|
||
|
||
/* Need to flush the register cache (and the frame cache) from a
|
||
previous debug session. If inferior_ptid ends up the same as the
|
||
last debug session --- e.g., b foo; run; gcore core1; step; gcore
|
||
core2; core core1; core core2 --- then there's potential for
|
||
get_current_regcache to return the cached regcache of the
|
||
previous session, and the frame cache being stale. */
|
||
registers_changed ();
|
||
|
||
/* Build up thread list from BFD sections, and possibly set the
|
||
current thread to the .reg/NN section matching the .reg
|
||
section. */
|
||
asection *reg_sect = bfd_get_section_by_name (core_bfd, ".reg");
|
||
for (asection *sect : gdb_bfd_sections (core_bfd))
|
||
add_to_thread_list (sect, reg_sect);
|
||
|
||
if (inferior_ptid == null_ptid)
|
||
{
|
||
/* Either we found no .reg/NN section, and hence we have a
|
||
non-threaded core (single-threaded, from gdb's perspective),
|
||
or for some reason add_to_thread_list couldn't determine
|
||
which was the "main" thread. The latter case shouldn't
|
||
usually happen, but we're dealing with input here, which can
|
||
always be broken in different ways. */
|
||
thread_info *thread = first_thread_of_inferior (current_inferior ());
|
||
|
||
if (thread == NULL)
|
||
{
|
||
inferior_appeared (current_inferior (), CORELOW_PID);
|
||
thread = add_thread_silent (target, ptid_t (CORELOW_PID));
|
||
}
|
||
|
||
switch_to_thread (thread);
|
||
}
|
||
|
||
if (current_program_space->exec_bfd () == nullptr)
|
||
locate_exec_from_corefile_build_id (core_bfd, from_tty);
|
||
|
||
post_create_inferior (from_tty);
|
||
|
||
/* Now go through the target stack looking for threads since there
|
||
may be a thread_stratum target loaded on top of target core by
|
||
now. The layer above should claim threads found in the BFD
|
||
sections. */
|
||
try
|
||
{
|
||
target_update_thread_list ();
|
||
}
|
||
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
exception_print (gdb_stderr, except);
|
||
}
|
||
|
||
p = bfd_core_file_failing_command (core_bfd);
|
||
if (p)
|
||
gdb_printf (_("Core was generated by `%s'.\n"), p);
|
||
|
||
/* Clearing any previous state of convenience variables. */
|
||
clear_exit_convenience_vars ();
|
||
|
||
siggy = bfd_core_file_failing_signal (core_bfd);
|
||
if (siggy > 0)
|
||
{
|
||
gdbarch *core_gdbarch = target->core_gdbarch ();
|
||
|
||
/* If we don't have a CORE_GDBARCH to work with, assume a native
|
||
core (map gdb_signal from host signals). If we do have
|
||
CORE_GDBARCH to work with, but no gdb_signal_from_target
|
||
implementation for that gdbarch, as a fallback measure,
|
||
assume the host signal mapping. It'll be correct for native
|
||
cores, but most likely incorrect for cross-cores. */
|
||
enum gdb_signal sig = (core_gdbarch != NULL
|
||
&& gdbarch_gdb_signal_from_target_p (core_gdbarch)
|
||
? gdbarch_gdb_signal_from_target (core_gdbarch,
|
||
siggy)
|
||
: gdb_signal_from_host (siggy));
|
||
|
||
gdb_printf (_("Program terminated with signal %s, %s"),
|
||
gdb_signal_to_name (sig), gdb_signal_to_string (sig));
|
||
if (gdbarch_report_signal_info_p (core_gdbarch))
|
||
gdbarch_report_signal_info (core_gdbarch, current_uiout, sig);
|
||
gdb_printf (_(".\n"));
|
||
|
||
/* Set the value of the internal variable $_exitsignal,
|
||
which holds the signal uncaught by the inferior. */
|
||
set_internalvar_integer (lookup_internalvar ("_exitsignal"),
|
||
siggy);
|
||
}
|
||
|
||
/* Fetch all registers from core file. */
|
||
target_fetch_registers (get_current_regcache (), -1);
|
||
|
||
/* Now, set up the frame cache, and print the top of stack. */
|
||
reinit_frame_cache ();
|
||
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
|
||
|
||
/* Current thread should be NUM 1 but the user does not know that.
|
||
If a program is single threaded gdb in general does not mention
|
||
anything about threads. That is why the test is >= 2. */
|
||
if (thread_count (target) >= 2)
|
||
{
|
||
try
|
||
{
|
||
thread_command (NULL, from_tty);
|
||
}
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
exception_print (gdb_stderr, except);
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
core_target::detach (inferior *inf, int from_tty)
|
||
{
|
||
/* Get rid of the core. Don't rely on core_target::close doing it,
|
||
because target_detach may be called with core_target's refcount > 1,
|
||
meaning core_target::close may not be called yet by the
|
||
unpush_target call below. */
|
||
clear_core ();
|
||
|
||
/* Note that 'this' may be dangling after this call. unpush_target
|
||
closes the target if the refcount reaches 0, and our close
|
||
implementation deletes 'this'. */
|
||
inf->unpush_target (this);
|
||
|
||
/* Clear the register cache and the frame cache. */
|
||
registers_changed ();
|
||
reinit_frame_cache ();
|
||
maybe_say_no_core_file_now (from_tty);
|
||
}
|
||
|
||
/* Try to retrieve registers from a section in core_bfd, and supply
|
||
them to REGSET.
|
||
|
||
If ptid's lwp member is zero, do the single-threaded
|
||
thing: look for a section named NAME. If ptid's lwp
|
||
member is non-zero, do the multi-threaded thing: look for a section
|
||
named "NAME/LWP", where LWP is the shortest ASCII decimal
|
||
representation of ptid's lwp member.
|
||
|
||
HUMAN_NAME is a human-readable name for the kind of registers the
|
||
NAME section contains, for use in error messages.
|
||
|
||
If REQUIRED is true, print an error if the core file doesn't have a
|
||
section by the appropriate name. Otherwise, just do nothing. */
|
||
|
||
void
|
||
core_target::get_core_register_section (struct regcache *regcache,
|
||
const struct regset *regset,
|
||
const char *name,
|
||
int section_min_size,
|
||
const char *human_name,
|
||
bool required)
|
||
{
|
||
gdb_assert (regset != nullptr);
|
||
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
bool variable_size_section = (regset->flags & REGSET_VARIABLE_SIZE);
|
||
|
||
thread_section_name section_name (name, regcache->ptid ());
|
||
|
||
section = bfd_get_section_by_name (core_bfd, section_name.c_str ());
|
||
if (! section)
|
||
{
|
||
if (required)
|
||
warning (_("Couldn't find %s registers in core file."),
|
||
human_name);
|
||
return;
|
||
}
|
||
|
||
size = bfd_section_size (section);
|
||
if (size < section_min_size)
|
||
{
|
||
warning (_("Section `%s' in core file too small."),
|
||
section_name.c_str ());
|
||
return;
|
||
}
|
||
if (size != section_min_size && !variable_size_section)
|
||
{
|
||
warning (_("Unexpected size of section `%s' in core file."),
|
||
section_name.c_str ());
|
||
}
|
||
|
||
gdb::byte_vector contents (size);
|
||
if (!bfd_get_section_contents (core_bfd, section, contents.data (),
|
||
(file_ptr) 0, size))
|
||
{
|
||
warning (_("Couldn't read %s registers from `%s' section in core file."),
|
||
human_name, section_name.c_str ());
|
||
return;
|
||
}
|
||
|
||
regset->supply_regset (regset, regcache, -1, contents.data (), size);
|
||
}
|
||
|
||
/* Data passed to gdbarch_iterate_over_regset_sections's callback. */
|
||
struct get_core_registers_cb_data
|
||
{
|
||
core_target *target;
|
||
struct regcache *regcache;
|
||
};
|
||
|
||
/* Callback for get_core_registers that handles a single core file
|
||
register note section. */
|
||
|
||
static void
|
||
get_core_registers_cb (const char *sect_name, int supply_size, int collect_size,
|
||
const struct regset *regset,
|
||
const char *human_name, void *cb_data)
|
||
{
|
||
gdb_assert (regset != nullptr);
|
||
|
||
auto *data = (get_core_registers_cb_data *) cb_data;
|
||
bool required = false;
|
||
bool variable_size_section = (regset->flags & REGSET_VARIABLE_SIZE);
|
||
|
||
if (!variable_size_section)
|
||
gdb_assert (supply_size == collect_size);
|
||
|
||
if (strcmp (sect_name, ".reg") == 0)
|
||
{
|
||
required = true;
|
||
if (human_name == NULL)
|
||
human_name = "general-purpose";
|
||
}
|
||
else if (strcmp (sect_name, ".reg2") == 0)
|
||
{
|
||
if (human_name == NULL)
|
||
human_name = "floating-point";
|
||
}
|
||
|
||
data->target->get_core_register_section (data->regcache, regset, sect_name,
|
||
supply_size, human_name, required);
|
||
}
|
||
|
||
/* Get the registers out of a core file. This is the machine-
|
||
independent part. Fetch_core_registers is the machine-dependent
|
||
part, typically implemented in the xm-file for each
|
||
architecture. */
|
||
|
||
/* We just get all the registers, so we don't use regno. */
|
||
|
||
void
|
||
core_target::fetch_registers (struct regcache *regcache, int regno)
|
||
{
|
||
if (!(m_core_gdbarch != nullptr
|
||
&& gdbarch_iterate_over_regset_sections_p (m_core_gdbarch)))
|
||
{
|
||
gdb_printf (gdb_stderr,
|
||
"Can't fetch registers from this type of core file\n");
|
||
return;
|
||
}
|
||
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
get_core_registers_cb_data data = { this, regcache };
|
||
gdbarch_iterate_over_regset_sections (gdbarch,
|
||
get_core_registers_cb,
|
||
(void *) &data, NULL);
|
||
|
||
/* Mark all registers not found in the core as unavailable. */
|
||
for (int i = 0; i < gdbarch_num_regs (regcache->arch ()); i++)
|
||
if (regcache->get_register_status (i) == REG_UNKNOWN)
|
||
regcache->raw_supply (i, NULL);
|
||
}
|
||
|
||
void
|
||
core_target::files_info ()
|
||
{
|
||
print_section_info (&m_core_section_table, core_bfd);
|
||
}
|
||
|
||
/* Helper method for core_target::xfer_partial. */
|
||
|
||
enum target_xfer_status
|
||
core_target::xfer_memory_via_mappings (gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len,
|
||
ULONGEST *xfered_len)
|
||
{
|
||
enum target_xfer_status xfer_status;
|
||
|
||
xfer_status = (section_table_xfer_memory_partial
|
||
(readbuf, writebuf,
|
||
offset, len, xfered_len,
|
||
m_core_file_mappings));
|
||
|
||
if (xfer_status == TARGET_XFER_OK || m_core_unavailable_mappings.empty ())
|
||
return xfer_status;
|
||
|
||
/* There are instances - e.g. when debugging within a docker
|
||
container using the AUFS storage driver - where the pathnames
|
||
obtained from the note section are incorrect. Despite the path
|
||
being wrong, just knowing the start and end addresses of the
|
||
mappings is still useful; we can attempt an access of the file
|
||
stratum constrained to the address ranges corresponding to the
|
||
unavailable mappings. */
|
||
|
||
ULONGEST memaddr = offset;
|
||
ULONGEST memend = offset + len;
|
||
|
||
for (const auto &mr : m_core_unavailable_mappings)
|
||
{
|
||
if (address_in_mem_range (memaddr, &mr))
|
||
{
|
||
if (!address_in_mem_range (memend, &mr))
|
||
len = mr.start + mr.length - memaddr;
|
||
|
||
xfer_status = this->beneath ()->xfer_partial (TARGET_OBJECT_MEMORY,
|
||
NULL,
|
||
readbuf,
|
||
writebuf,
|
||
offset,
|
||
len,
|
||
xfered_len);
|
||
break;
|
||
}
|
||
}
|
||
|
||
return xfer_status;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
core_target::xfer_partial (enum target_object object, const char *annex,
|
||
gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
switch (object)
|
||
{
|
||
case TARGET_OBJECT_MEMORY:
|
||
{
|
||
enum target_xfer_status xfer_status;
|
||
|
||
/* Try accessing memory contents from core file data,
|
||
restricting consideration to those sections for which
|
||
the BFD section flag SEC_HAS_CONTENTS is set. */
|
||
auto has_contents_cb = [] (const struct target_section *s)
|
||
{
|
||
return ((s->the_bfd_section->flags & SEC_HAS_CONTENTS) != 0);
|
||
};
|
||
xfer_status = section_table_xfer_memory_partial
|
||
(readbuf, writebuf,
|
||
offset, len, xfered_len,
|
||
m_core_section_table,
|
||
has_contents_cb);
|
||
if (xfer_status == TARGET_XFER_OK)
|
||
return TARGET_XFER_OK;
|
||
|
||
/* 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.
|
||
|
||
We also check unavailable mappings due to Docker/AUFS driver
|
||
issues. */
|
||
if (!m_core_file_mappings.empty ()
|
||
|| !m_core_unavailable_mappings.empty ())
|
||
{
|
||
xfer_status = xfer_memory_via_mappings (readbuf, writebuf, offset,
|
||
len, xfered_len);
|
||
}
|
||
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;
|
||
|
||
/* Finally, attempt to access data in core file sections with
|
||
no contents. These will typically read as all zero. */
|
||
auto no_contents_cb = [&] (const struct target_section *s)
|
||
{
|
||
return !has_contents_cb (s);
|
||
};
|
||
xfer_status = section_table_xfer_memory_partial
|
||
(readbuf, writebuf,
|
||
offset, len, xfered_len,
|
||
m_core_section_table,
|
||
no_contents_cb);
|
||
|
||
return xfer_status;
|
||
}
|
||
case TARGET_OBJECT_AUXV:
|
||
if (readbuf)
|
||
{
|
||
/* When the aux vector is stored in core file, BFD
|
||
represents this with a fake section called ".auxv". */
|
||
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
|
||
section = bfd_get_section_by_name (core_bfd, ".auxv");
|
||
if (section == NULL)
|
||
return TARGET_XFER_E_IO;
|
||
|
||
size = bfd_section_size (section);
|
||
if (offset >= size)
|
||
return TARGET_XFER_EOF;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
|
||
if (size == 0)
|
||
return TARGET_XFER_EOF;
|
||
if (!bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read NT_AUXV note in core file."));
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
*xfered_len = (ULONGEST) size;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_WCOOKIE:
|
||
if (readbuf)
|
||
{
|
||
/* When the StackGhost cookie is stored in core file, BFD
|
||
represents this with a fake section called
|
||
".wcookie". */
|
||
|
||
struct bfd_section *section;
|
||
bfd_size_type size;
|
||
|
||
section = bfd_get_section_by_name (core_bfd, ".wcookie");
|
||
if (section == NULL)
|
||
return TARGET_XFER_E_IO;
|
||
|
||
size = bfd_section_size (section);
|
||
if (offset >= size)
|
||
return TARGET_XFER_EOF;
|
||
size -= offset;
|
||
if (size > len)
|
||
size = len;
|
||
|
||
if (size == 0)
|
||
return TARGET_XFER_EOF;
|
||
if (!bfd_get_section_contents (core_bfd, section, readbuf,
|
||
(file_ptr) offset, size))
|
||
{
|
||
warning (_("Couldn't read StackGhost cookie in core file."));
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
*xfered_len = (ULONGEST) size;
|
||
return TARGET_XFER_OK;
|
||
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_LIBRARIES:
|
||
if (m_core_gdbarch != nullptr
|
||
&& gdbarch_core_xfer_shared_libraries_p (m_core_gdbarch))
|
||
{
|
||
if (writebuf)
|
||
return TARGET_XFER_E_IO;
|
||
else
|
||
{
|
||
*xfered_len = gdbarch_core_xfer_shared_libraries (m_core_gdbarch,
|
||
readbuf,
|
||
offset, len);
|
||
|
||
if (*xfered_len == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_LIBRARIES_AIX:
|
||
if (m_core_gdbarch != nullptr
|
||
&& gdbarch_core_xfer_shared_libraries_aix_p (m_core_gdbarch))
|
||
{
|
||
if (writebuf)
|
||
return TARGET_XFER_E_IO;
|
||
else
|
||
{
|
||
*xfered_len
|
||
= gdbarch_core_xfer_shared_libraries_aix (m_core_gdbarch,
|
||
readbuf, offset,
|
||
len);
|
||
|
||
if (*xfered_len == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_SIGNAL_INFO:
|
||
if (readbuf)
|
||
{
|
||
if (m_core_gdbarch != nullptr
|
||
&& gdbarch_core_xfer_siginfo_p (m_core_gdbarch))
|
||
{
|
||
LONGEST l = gdbarch_core_xfer_siginfo (m_core_gdbarch, readbuf,
|
||
offset, len);
|
||
|
||
if (l >= 0)
|
||
{
|
||
*xfered_len = l;
|
||
if (l == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
}
|
||
return TARGET_XFER_E_IO;
|
||
|
||
default:
|
||
return this->beneath ()->xfer_partial (object, annex, readbuf,
|
||
writebuf, offset, len,
|
||
xfered_len);
|
||
}
|
||
}
|
||
|
||
|
||
|
||
/* Okay, let's be honest: threads gleaned from a core file aren't
|
||
exactly lively, are they? On the other hand, if we don't claim
|
||
that each & every one is alive, then we don't get any of them
|
||
to appear in an "info thread" command, which is quite a useful
|
||
behaviour.
|
||
*/
|
||
bool
|
||
core_target::thread_alive (ptid_t ptid)
|
||
{
|
||
return true;
|
||
}
|
||
|
||
/* Ask the current architecture what it knows about this core file.
|
||
That will be used, in turn, to pick a better architecture. This
|
||
wrapper could be avoided if targets got a chance to specialize
|
||
core_target. */
|
||
|
||
const struct target_desc *
|
||
core_target::read_description ()
|
||
{
|
||
/* If the core file contains a target description note then we will use
|
||
that in preference to anything else. */
|
||
bfd_size_type tdesc_note_size = 0;
|
||
struct bfd_section *tdesc_note_section
|
||
= bfd_get_section_by_name (core_bfd, ".gdb-tdesc");
|
||
if (tdesc_note_section != nullptr)
|
||
tdesc_note_size = bfd_section_size (tdesc_note_section);
|
||
if (tdesc_note_size > 0)
|
||
{
|
||
gdb::char_vector contents (tdesc_note_size + 1);
|
||
if (bfd_get_section_contents (core_bfd, tdesc_note_section,
|
||
contents.data (), (file_ptr) 0,
|
||
tdesc_note_size))
|
||
{
|
||
/* Ensure we have a null terminator. */
|
||
contents[tdesc_note_size] = '\0';
|
||
const struct target_desc *result
|
||
= string_read_description_xml (contents.data ());
|
||
if (result != nullptr)
|
||
return result;
|
||
}
|
||
}
|
||
|
||
if (m_core_gdbarch && gdbarch_core_read_description_p (m_core_gdbarch))
|
||
{
|
||
const struct target_desc *result;
|
||
|
||
result = gdbarch_core_read_description (m_core_gdbarch, this, core_bfd);
|
||
if (result != NULL)
|
||
return result;
|
||
}
|
||
|
||
return this->beneath ()->read_description ();
|
||
}
|
||
|
||
std::string
|
||
core_target::pid_to_str (ptid_t ptid)
|
||
{
|
||
struct inferior *inf;
|
||
int pid;
|
||
|
||
/* The preferred way is to have a gdbarch/OS specific
|
||
implementation. */
|
||
if (m_core_gdbarch != nullptr
|
||
&& gdbarch_core_pid_to_str_p (m_core_gdbarch))
|
||
return gdbarch_core_pid_to_str (m_core_gdbarch, ptid);
|
||
|
||
/* Otherwise, if we don't have one, we'll just fallback to
|
||
"process", with normal_pid_to_str. */
|
||
|
||
/* Try the LWPID field first. */
|
||
pid = ptid.lwp ();
|
||
if (pid != 0)
|
||
return normal_pid_to_str (ptid_t (pid));
|
||
|
||
/* Otherwise, this isn't a "threaded" core -- use the PID field, but
|
||
only if it isn't a fake PID. */
|
||
inf = find_inferior_ptid (this, ptid);
|
||
if (inf != NULL && !inf->fake_pid_p)
|
||
return normal_pid_to_str (ptid);
|
||
|
||
/* No luck. We simply don't have a valid PID to print. */
|
||
return "<main task>";
|
||
}
|
||
|
||
const char *
|
||
core_target::thread_name (struct thread_info *thr)
|
||
{
|
||
if (m_core_gdbarch != nullptr
|
||
&& gdbarch_core_thread_name_p (m_core_gdbarch))
|
||
return gdbarch_core_thread_name (m_core_gdbarch, thr);
|
||
return NULL;
|
||
}
|
||
|
||
bool
|
||
core_target::has_memory ()
|
||
{
|
||
return (core_bfd != NULL);
|
||
}
|
||
|
||
bool
|
||
core_target::has_stack ()
|
||
{
|
||
return (core_bfd != NULL);
|
||
}
|
||
|
||
bool
|
||
core_target::has_registers ()
|
||
{
|
||
return (core_bfd != NULL);
|
||
}
|
||
|
||
/* Implement the to_info_proc method. */
|
||
|
||
bool
|
||
core_target::info_proc (const char *args, enum info_proc_what request)
|
||
{
|
||
struct gdbarch *gdbarch = get_current_arch ();
|
||
|
||
/* Since this is the core file target, call the 'core_info_proc'
|
||
method on gdbarch, not 'info_proc'. */
|
||
if (gdbarch_core_info_proc_p (gdbarch))
|
||
gdbarch_core_info_proc (gdbarch, args, request);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Implementation of the "supports_memory_tagging" target_ops method. */
|
||
|
||
bool
|
||
core_target::supports_memory_tagging ()
|
||
{
|
||
/* Look for memory tag sections. If they exist, that means this core file
|
||
supports memory tagging. */
|
||
|
||
return (bfd_get_section_by_name (core_bfd, "memtag") != nullptr);
|
||
}
|
||
|
||
/* Implementation of the "fetch_memtags" target_ops method. */
|
||
|
||
bool
|
||
core_target::fetch_memtags (CORE_ADDR address, size_t len,
|
||
gdb::byte_vector &tags, int type)
|
||
{
|
||
struct gdbarch *gdbarch = target_gdbarch ();
|
||
|
||
/* Make sure we have a way to decode the memory tag notes. */
|
||
if (!gdbarch_decode_memtag_section_p (gdbarch))
|
||
error (_("gdbarch_decode_memtag_section not implemented for this "
|
||
"architecture."));
|
||
|
||
memtag_section_info info;
|
||
info.memtag_section = nullptr;
|
||
|
||
while (get_next_core_memtag_section (core_bfd, info.memtag_section,
|
||
address, info))
|
||
{
|
||
size_t adjusted_length
|
||
= (address + len < info.end_address) ? len : (info.end_address - address);
|
||
|
||
/* Decode the memory tag note and return the tags. */
|
||
gdb::byte_vector tags_read
|
||
= gdbarch_decode_memtag_section (gdbarch, info.memtag_section, type,
|
||
address, adjusted_length);
|
||
|
||
/* Transfer over the tags that have been read. */
|
||
tags.insert (tags.end (), tags_read.begin (), tags_read.end ());
|
||
|
||
/* ADDRESS + LEN may cross the boundaries of a particular memory tag
|
||
segment. Check if we need to fetch tags from a different section. */
|
||
if (!tags_read.empty () && (address + len) < info.end_address)
|
||
return true;
|
||
|
||
/* There are more tags to fetch. Update ADDRESS and LEN. */
|
||
len -= (info.end_address - address);
|
||
address = info.end_address;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* 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.empty ())
|
||
{
|
||
gdb_printf (_("Mapped address spaces:\n\n"));
|
||
if (gdbarch_addr_bit (gdbarch) == 32)
|
||
{
|
||
gdb_printf ("\t%10s %10s %10s %10s %s\n",
|
||
"Start Addr",
|
||
" End Addr",
|
||
" Size", " Offset", "objfile");
|
||
}
|
||
else
|
||
{
|
||
gdb_printf (" %18s %18s %10s %10s %s\n",
|
||
"Start Addr",
|
||
" End Addr",
|
||
" Size", " Offset", "objfile");
|
||
}
|
||
}
|
||
|
||
for (const target_section &tsp : m_core_file_mappings)
|
||
{
|
||
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)
|
||
gdb_printf ("\t%10s %10s %10s %10s %s\n",
|
||
paddress (gdbarch, start),
|
||
paddress (gdbarch, end),
|
||
hex_string (end - start),
|
||
hex_string (file_ofs),
|
||
filename);
|
||
else
|
||
gdb_printf (" %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);
|
||
}
|