mirror of
https://sourceware.org/git/binutils-gdb.git
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268a13a5a3
This is the next patch in the ongoing series to move gdbsever to the top level. This patch just renames the "common" directory. The idea is to do this move in two parts: first rename the directory (this patch), then move the directory to the top. This approach makes the patches a bit more tractable. I chose the name "gdbsupport" for the directory. However, as this patch was largely written by sed, we could pick a new name without too much difficulty. Tested by the buildbot. gdb/ChangeLog 2019-07-09 Tom Tromey <tom@tromey.com> * contrib/ari/gdb_ari.sh: Change common to gdbsupport. * configure: Rebuild. * configure.ac: Change common to gdbsupport. * gdbsupport: Rename from common. * acinclude.m4: Change common to gdbsupport. * Makefile.in (CONFIG_SRC_SUBDIR, COMMON_SFILES) (HFILES_NO_SRCDIR, stamp-version, ALLDEPFILES): Change common to gdbsupport. * aarch64-tdep.c, ada-lang.c, ada-lang.h, agent.c, alloc.c, amd64-darwin-tdep.c, amd64-dicos-tdep.c, amd64-fbsd-nat.c, amd64-fbsd-tdep.c, amd64-linux-nat.c, amd64-linux-tdep.c, amd64-nbsd-tdep.c, amd64-obsd-tdep.c, amd64-sol2-tdep.c, amd64-tdep.c, amd64-windows-tdep.c, arch-utils.c, arch/aarch64-insn.c, arch/aarch64.c, arch/aarch64.h, arch/amd64.c, arch/amd64.h, arch/arm-get-next-pcs.c, arch/arm-linux.c, arch/arm.c, arch/i386.c, arch/i386.h, arch/ppc-linux-common.c, arch/riscv.c, arch/riscv.h, arch/tic6x.c, arm-tdep.c, auto-load.c, auxv.c, ax-gdb.c, ax-general.c, ax.h, breakpoint.c, breakpoint.h, btrace.c, btrace.h, build-id.c, build-id.h, c-lang.h, charset.c, charset.h, cli/cli-cmds.c, cli/cli-cmds.h, cli/cli-decode.c, cli/cli-dump.c, cli/cli-option.h, cli/cli-script.c, coff-pe-read.c, command.h, compile/compile-c-support.c, compile/compile-c.h, compile/compile-cplus-symbols.c, compile/compile-cplus-types.c, compile/compile-cplus.h, compile/compile-loc2c.c, compile/compile.c, completer.c, completer.h, contrib/ari/gdb_ari.sh, corefile.c, corelow.c, cp-support.c, cp-support.h, cp-valprint.c, csky-tdep.c, ctf.c, darwin-nat.c, debug.c, defs.h, disasm-selftests.c, disasm.c, disasm.h, dtrace-probe.c, dwarf-index-cache.c, dwarf-index-cache.h, dwarf-index-write.c, dwarf2-frame.c, dwarf2expr.c, dwarf2loc.c, dwarf2read.c, event-loop.c, event-top.c, exceptions.c, exec.c, extension.h, fbsd-nat.c, features/aarch64-core.c, features/aarch64-fpu.c, features/aarch64-pauth.c, features/aarch64-sve.c, features/i386/32bit-avx.c, features/i386/32bit-avx512.c, features/i386/32bit-core.c, features/i386/32bit-linux.c, features/i386/32bit-mpx.c, features/i386/32bit-pkeys.c, features/i386/32bit-segments.c, features/i386/32bit-sse.c, features/i386/64bit-avx.c, features/i386/64bit-avx512.c, features/i386/64bit-core.c, features/i386/64bit-linux.c, features/i386/64bit-mpx.c, features/i386/64bit-pkeys.c, features/i386/64bit-segments.c, features/i386/64bit-sse.c, features/i386/x32-core.c, features/riscv/32bit-cpu.c, features/riscv/32bit-csr.c, features/riscv/32bit-fpu.c, features/riscv/64bit-cpu.c, features/riscv/64bit-csr.c, features/riscv/64bit-fpu.c, features/tic6x-c6xp.c, features/tic6x-core.c, features/tic6x-gp.c, filename-seen-cache.h, findcmd.c, findvar.c, fork-child.c, gcore.c, gdb_bfd.c, gdb_bfd.h, gdb_proc_service.h, gdb_regex.c, gdb_select.h, gdb_usleep.c, gdbarch-selftests.c, gdbthread.h, gdbtypes.h, gnu-nat.c, go32-nat.c, guile/guile.c, guile/scm-ports.c, guile/scm-safe-call.c, guile/scm-type.c, i386-fbsd-nat.c, i386-fbsd-tdep.c, i386-go32-tdep.c, i386-linux-nat.c, i386-linux-tdep.c, i386-tdep.c, i387-tdep.c, ia64-libunwind-tdep.c, ia64-linux-nat.c, inf-child.c, inf-ptrace.c, infcall.c, infcall.h, infcmd.c, inferior-iter.h, inferior.c, inferior.h, inflow.c, inflow.h, infrun.c, infrun.h, inline-frame.c, language.h, linespec.c, linux-fork.c, linux-nat.c, linux-tdep.c, linux-thread-db.c, location.c, machoread.c, macrotab.h, main.c, maint.c, maint.h, memattr.c, memrange.h, mi/mi-cmd-break.h, mi/mi-cmd-env.c, mi/mi-cmd-stack.c, mi/mi-cmd-var.c, mi/mi-interp.c, mi/mi-main.c, mi/mi-parse.h, minsyms.c, mips-linux-tdep.c, namespace.h, nat/aarch64-linux-hw-point.c, nat/aarch64-linux-hw-point.h, nat/aarch64-linux.c, nat/aarch64-sve-linux-ptrace.c, nat/amd64-linux-siginfo.c, nat/fork-inferior.c, nat/linux-btrace.c, nat/linux-btrace.h, nat/linux-namespaces.c, nat/linux-nat.h, nat/linux-osdata.c, nat/linux-personality.c, nat/linux-procfs.c, nat/linux-ptrace.c, nat/linux-ptrace.h, nat/linux-waitpid.c, nat/mips-linux-watch.c, nat/mips-linux-watch.h, nat/ppc-linux.c, nat/x86-dregs.c, nat/x86-dregs.h, nat/x86-linux-dregs.c, nat/x86-linux.c, nto-procfs.c, nto-tdep.c, objfile-flags.h, objfiles.c, objfiles.h, obsd-nat.c, observable.h, osdata.c, p-valprint.c, parse.c, parser-defs.h, ppc-linux-nat.c, printcmd.c, probe.c, proc-api.c, procfs.c, producer.c, progspace.h, psymtab.h, python/py-framefilter.c, python/py-inferior.c, python/py-ref.h, python/py-type.c, python/python.c, record-btrace.c, record-full.c, record.c, record.h, regcache-dump.c, regcache.c, regcache.h, remote-fileio.c, remote-fileio.h, remote-sim.c, remote.c, riscv-tdep.c, rs6000-aix-tdep.c, rust-exp.y, s12z-tdep.c, selftest-arch.c, ser-base.c, ser-event.c, ser-pipe.c, ser-tcp.c, ser-unix.c, skip.c, solib-aix.c, solib-target.c, solib.c, source-cache.c, source.c, source.h, sparc-nat.c, spu-linux-nat.c, stack.c, stap-probe.c, symfile-add-flags.h, symfile.c, symfile.h, symtab.c, symtab.h, target-descriptions.c, target-descriptions.h, target-memory.c, target.c, target.h, target/waitstatus.c, target/waitstatus.h, thread-iter.h, thread.c, tilegx-tdep.c, top.c, top.h, tracefile-tfile.c, tracefile.c, tracepoint.c, tracepoint.h, tui/tui-io.c, ui-file.c, ui-out.h, unittests/array-view-selftests.c, unittests/child-path-selftests.c, unittests/cli-utils-selftests.c, unittests/common-utils-selftests.c, unittests/copy_bitwise-selftests.c, unittests/environ-selftests.c, unittests/format_pieces-selftests.c, unittests/function-view-selftests.c, unittests/lookup_name_info-selftests.c, unittests/memory-map-selftests.c, unittests/memrange-selftests.c, unittests/mkdir-recursive-selftests.c, unittests/observable-selftests.c, unittests/offset-type-selftests.c, unittests/optional-selftests.c, unittests/parse-connection-spec-selftests.c, unittests/ptid-selftests.c, unittests/rsp-low-selftests.c, unittests/scoped_fd-selftests.c, unittests/scoped_mmap-selftests.c, unittests/scoped_restore-selftests.c, unittests/string_view-selftests.c, unittests/style-selftests.c, unittests/tracepoint-selftests.c, unittests/unpack-selftests.c, unittests/utils-selftests.c, unittests/xml-utils-selftests.c, utils.c, utils.h, valarith.c, valops.c, valprint.c, value.c, value.h, varobj.c, varobj.h, windows-nat.c, x86-linux-nat.c, xml-support.c, xml-support.h, xml-tdesc.h, xstormy16-tdep.c, xtensa-linux-nat.c, dwarf2read.h: Change common to gdbsupport. gdb/gdbserver/ChangeLog 2019-07-09 Tom Tromey <tom@tromey.com> * configure: Rebuild. * configure.ac: Change common to gdbsupport. * acinclude.m4: Change common to gdbsupport. * Makefile.in (SFILES, OBS, GDBREPLAY_OBS, IPA_OBJS) (version-generated.c, gdbsupport/%-ipa.o, gdbsupport/%.o): Change common to gdbsupport. * ax.c, event-loop.c, fork-child.c, gdb_proc_service.h, gdbreplay.c, gdbthread.h, hostio-errno.c, hostio.c, i387-fp.c, inferiors.c, inferiors.h, linux-aarch64-tdesc-selftest.c, linux-amd64-ipa.c, linux-i386-ipa.c, linux-low.c, linux-tic6x-low.c, linux-x86-low.c, linux-x86-tdesc-selftest.c, linux-x86-tdesc.c, lynx-i386-low.c, lynx-low.c, mem-break.h, nto-x86-low.c, regcache.c, regcache.h, remote-utils.c, server.c, server.h, spu-low.c, symbol.c, target.h, tdesc.c, tdesc.h, thread-db.c, tracepoint.c, win32-i386-low.c, win32-low.c: Change common to gdbsupport.
1079 lines
29 KiB
C
1079 lines
29 KiB
C
/* Work with executable files, for GDB.
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Copyright (C) 1988-2019 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 "frame.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdbcmd.h"
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#include "language.h"
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#include "filenames.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "completer.h"
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#include "value.h"
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#include "exec.h"
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#include "observable.h"
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#include "arch-utils.h"
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#include "gdbthread.h"
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#include "progspace.h"
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#include "gdb_bfd.h"
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#include "gcore.h"
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#include "source.h"
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#include <fcntl.h>
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#include "readline/readline.h"
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#include "gdbcore.h"
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#include <ctype.h>
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#include <sys/stat.h>
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#include "solist.h"
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#include <algorithm>
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#include "gdbsupport/pathstuff.h"
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void (*deprecated_file_changed_hook) (const char *);
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static const target_info exec_target_info = {
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"exec",
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N_("Local exec file"),
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N_("Use an executable file as a target.\n\
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Specify the filename of the executable file.")
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};
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/* The target vector for executable files. */
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struct exec_target final : public target_ops
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{
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const target_info &info () const override
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{ return exec_target_info; }
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strata stratum () const override { return file_stratum; }
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void close () 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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struct target_section_table *get_section_table () override;
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void files_info () override;
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bool has_memory () override;
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char *make_corefile_notes (bfd *, int *) override;
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int find_memory_regions (find_memory_region_ftype func, void *data) override;
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};
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static exec_target exec_ops;
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/* Whether to open exec and core files read-only or read-write. */
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int write_files = 0;
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static void
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show_write_files (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("Writing into executable and core files is %s.\n"),
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value);
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}
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static void
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exec_target_open (const char *args, int from_tty)
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{
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target_preopen (from_tty);
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exec_file_attach (args, from_tty);
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}
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/* Close and clear exec_bfd. If we end up with no target sections to
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read memory from, this unpushes the exec_ops target. */
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void
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exec_close (void)
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{
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if (exec_bfd)
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{
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bfd *abfd = exec_bfd;
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gdb_bfd_unref (abfd);
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/* Removing target sections may close the exec_ops target.
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Clear exec_bfd before doing so to prevent recursion. */
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exec_bfd = NULL;
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exec_bfd_mtime = 0;
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remove_target_sections (&exec_bfd);
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xfree (exec_filename);
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exec_filename = NULL;
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}
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}
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/* This is the target_close implementation. Clears all target
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sections and closes all executable bfds from all program spaces. */
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void
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exec_target::close ()
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{
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struct program_space *ss;
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scoped_restore_current_program_space restore_pspace;
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ALL_PSPACES (ss)
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{
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set_current_program_space (ss);
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clear_section_table (current_target_sections);
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exec_close ();
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}
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}
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/* See gdbcore.h. */
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void
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try_open_exec_file (const char *exec_file_host, struct inferior *inf,
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symfile_add_flags add_flags)
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{
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struct gdb_exception prev_err;
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/* exec_file_attach and symbol_file_add_main may throw an error if the file
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cannot be opened either locally or remotely.
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This happens for example, when the file is first found in the local
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sysroot (above), and then disappears (a TOCTOU race), or when it doesn't
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exist in the target filesystem, or when the file does exist, but
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is not readable.
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Even without a symbol file, the remote-based debugging session should
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continue normally instead of ending abruptly. Hence we catch thrown
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errors/exceptions in the following code. */
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try
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{
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/* We must do this step even if exec_file_host is NULL, so that
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exec_file_attach will clear state. */
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exec_file_attach (exec_file_host, add_flags & SYMFILE_VERBOSE);
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}
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catch (gdb_exception_error &err)
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{
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if (err.message != NULL)
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warning ("%s", err.what ());
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prev_err = std::move (err);
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}
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if (exec_file_host != NULL)
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{
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try
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{
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symbol_file_add_main (exec_file_host, add_flags);
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}
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catch (const gdb_exception_error &err)
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{
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if (!exception_print_same (prev_err, err))
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warning ("%s", err.what ());
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}
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}
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}
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/* See gdbcore.h. */
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void
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exec_file_locate_attach (int pid, int defer_bp_reset, int from_tty)
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{
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char *exec_file_target;
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symfile_add_flags add_flags = 0;
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/* Do nothing if we already have an executable filename. */
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if (get_exec_file (0) != NULL)
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return;
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/* Try to determine a filename from the process itself. */
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exec_file_target = target_pid_to_exec_file (pid);
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if (exec_file_target == NULL)
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{
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warning (_("No executable has been specified and target does not "
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"support\n"
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"determining executable automatically. "
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"Try using the \"file\" command."));
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return;
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}
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gdb::unique_xmalloc_ptr<char> exec_file_host
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= exec_file_find (exec_file_target, NULL);
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if (defer_bp_reset)
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add_flags |= SYMFILE_DEFER_BP_RESET;
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if (from_tty)
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add_flags |= SYMFILE_VERBOSE;
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/* Attempt to open the exec file. */
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try_open_exec_file (exec_file_host.get (), current_inferior (), add_flags);
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}
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/* Set FILENAME as the new exec file.
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This function is intended to be behave essentially the same
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as exec_file_command, except that the latter will detect when
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a target is being debugged, and will ask the user whether it
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should be shut down first. (If the answer is "no", then the
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new file is ignored.)
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This file is used by exec_file_command, to do the work of opening
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and processing the exec file after any prompting has happened.
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And, it is used by child_attach, when the attach command was
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given a pid but not a exec pathname, and the attach command could
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figure out the pathname from the pid. (In this case, we shouldn't
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ask the user whether the current target should be shut down --
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we're supplying the exec pathname late for good reason.) */
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void
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exec_file_attach (const char *filename, int from_tty)
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{
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/* First, acquire a reference to the current exec_bfd. We release
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this at the end of the function; but acquiring it now lets the
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BFD cache return it if this call refers to the same file. */
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gdb_bfd_ref_ptr exec_bfd_holder = gdb_bfd_ref_ptr::new_reference (exec_bfd);
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/* Remove any previous exec file. */
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exec_close ();
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/* Now open and digest the file the user requested, if any. */
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if (!filename)
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{
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if (from_tty)
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printf_unfiltered (_("No executable file now.\n"));
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set_gdbarch_from_file (NULL);
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}
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else
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{
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int load_via_target = 0;
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const char *scratch_pathname, *canonical_pathname;
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int scratch_chan;
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struct target_section *sections = NULL, *sections_end = NULL;
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char **matching;
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if (is_target_filename (filename))
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{
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if (target_filesystem_is_local ())
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filename += strlen (TARGET_SYSROOT_PREFIX);
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else
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load_via_target = 1;
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}
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gdb::unique_xmalloc_ptr<char> canonical_storage, scratch_storage;
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if (load_via_target)
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{
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/* gdb_bfd_fopen does not support "target:" filenames. */
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if (write_files)
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warning (_("writing into executable files is "
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"not supported for %s sysroots"),
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TARGET_SYSROOT_PREFIX);
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scratch_pathname = filename;
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scratch_chan = -1;
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canonical_pathname = scratch_pathname;
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}
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else
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{
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scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST,
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filename, write_files ?
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O_RDWR | O_BINARY : O_RDONLY | O_BINARY,
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&scratch_storage);
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#if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
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if (scratch_chan < 0)
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{
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char *exename = (char *) alloca (strlen (filename) + 5);
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strcat (strcpy (exename, filename), ".exe");
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scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST,
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exename, write_files ?
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O_RDWR | O_BINARY
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: O_RDONLY | O_BINARY,
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&scratch_storage);
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}
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||
#endif
|
||
if (scratch_chan < 0)
|
||
perror_with_name (filename);
|
||
|
||
scratch_pathname = scratch_storage.get ();
|
||
|
||
/* gdb_bfd_open (and its variants) prefers canonicalized
|
||
pathname for better BFD caching. */
|
||
canonical_storage = gdb_realpath (scratch_pathname);
|
||
canonical_pathname = canonical_storage.get ();
|
||
}
|
||
|
||
gdb_bfd_ref_ptr temp;
|
||
if (write_files && !load_via_target)
|
||
temp = gdb_bfd_fopen (canonical_pathname, gnutarget,
|
||
FOPEN_RUB, scratch_chan);
|
||
else
|
||
temp = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan);
|
||
exec_bfd = temp.release ();
|
||
|
||
if (!exec_bfd)
|
||
{
|
||
error (_("\"%s\": could not open as an executable file: %s."),
|
||
scratch_pathname, bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
|
||
/* gdb_realpath_keepfile resolves symlinks on the local
|
||
filesystem and so cannot be used for "target:" files. */
|
||
gdb_assert (exec_filename == NULL);
|
||
if (load_via_target)
|
||
exec_filename = xstrdup (bfd_get_filename (exec_bfd));
|
||
else
|
||
exec_filename = gdb_realpath_keepfile (scratch_pathname).release ();
|
||
|
||
if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching))
|
||
{
|
||
/* Make sure to close exec_bfd, or else "run" might try to use
|
||
it. */
|
||
exec_close ();
|
||
error (_("\"%s\": not in executable format: %s"),
|
||
scratch_pathname,
|
||
gdb_bfd_errmsg (bfd_get_error (), matching).c_str ());
|
||
}
|
||
|
||
if (build_section_table (exec_bfd, §ions, §ions_end))
|
||
{
|
||
/* Make sure to close exec_bfd, or else "run" might try to use
|
||
it. */
|
||
exec_close ();
|
||
error (_("\"%s\": can't find the file sections: %s"),
|
||
scratch_pathname, bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
|
||
exec_bfd_mtime = bfd_get_mtime (exec_bfd);
|
||
|
||
validate_files ();
|
||
|
||
set_gdbarch_from_file (exec_bfd);
|
||
|
||
/* Add the executable's sections to the current address spaces'
|
||
list of sections. This possibly pushes the exec_ops
|
||
target. */
|
||
add_target_sections (&exec_bfd, sections, sections_end);
|
||
xfree (sections);
|
||
|
||
/* Tell display code (if any) about the changed file name. */
|
||
if (deprecated_exec_file_display_hook)
|
||
(*deprecated_exec_file_display_hook) (filename);
|
||
}
|
||
|
||
bfd_cache_close_all ();
|
||
gdb::observers::executable_changed.notify ();
|
||
}
|
||
|
||
/* Process the first arg in ARGS as the new exec file.
|
||
|
||
Note that we have to explicitly ignore additional args, since we can
|
||
be called from file_command(), which also calls symbol_file_command()
|
||
which can take multiple args.
|
||
|
||
If ARGS is NULL, we just want to close the exec file. */
|
||
|
||
static void
|
||
exec_file_command (const char *args, int from_tty)
|
||
{
|
||
if (from_tty && target_has_execution
|
||
&& !query (_("A program is being debugged already.\n"
|
||
"Are you sure you want to change the file? ")))
|
||
error (_("File not changed."));
|
||
|
||
if (args)
|
||
{
|
||
/* Scan through the args and pick up the first non option arg
|
||
as the filename. */
|
||
|
||
gdb_argv built_argv (args);
|
||
char **argv = built_argv.get ();
|
||
|
||
for (; (*argv != NULL) && (**argv == '-'); argv++)
|
||
{;
|
||
}
|
||
if (*argv == NULL)
|
||
error (_("No executable file name was specified"));
|
||
|
||
gdb::unique_xmalloc_ptr<char> filename (tilde_expand (*argv));
|
||
exec_file_attach (filename.get (), from_tty);
|
||
}
|
||
else
|
||
exec_file_attach (NULL, from_tty);
|
||
}
|
||
|
||
/* Set both the exec file and the symbol file, in one command.
|
||
What a novelty. Why did GDB go through four major releases before this
|
||
command was added? */
|
||
|
||
static void
|
||
file_command (const char *arg, int from_tty)
|
||
{
|
||
/* FIXME, if we lose on reading the symbol file, we should revert
|
||
the exec file, but that's rough. */
|
||
exec_file_command (arg, from_tty);
|
||
symbol_file_command (arg, from_tty);
|
||
if (deprecated_file_changed_hook)
|
||
deprecated_file_changed_hook (arg);
|
||
}
|
||
|
||
|
||
/* Locate all mappable sections of a BFD file.
|
||
table_pp_char is a char * to get it through bfd_map_over_sections;
|
||
we cast it back to its proper type. */
|
||
|
||
static void
|
||
add_to_section_table (bfd *abfd, struct bfd_section *asect,
|
||
void *table_pp_char)
|
||
{
|
||
struct target_section **table_pp = (struct target_section **) table_pp_char;
|
||
flagword aflag;
|
||
|
||
gdb_assert (abfd == asect->owner);
|
||
|
||
/* Check the section flags, but do not discard zero-length sections, since
|
||
some symbols may still be attached to this section. For instance, we
|
||
encountered on sparc-solaris 2.10 a shared library with an empty .bss
|
||
section to which a symbol named "_end" was attached. The address
|
||
of this symbol still needs to be relocated. */
|
||
aflag = bfd_get_section_flags (abfd, asect);
|
||
if (!(aflag & SEC_ALLOC))
|
||
return;
|
||
|
||
(*table_pp)->owner = NULL;
|
||
(*table_pp)->the_bfd_section = asect;
|
||
(*table_pp)->addr = bfd_section_vma (abfd, asect);
|
||
(*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
|
||
(*table_pp)++;
|
||
}
|
||
|
||
/* See exec.h. */
|
||
|
||
void
|
||
clear_section_table (struct target_section_table *table)
|
||
{
|
||
xfree (table->sections);
|
||
table->sections = table->sections_end = NULL;
|
||
}
|
||
|
||
/* Resize section table TABLE by ADJUSTMENT.
|
||
ADJUSTMENT may be negative, in which case the caller must have already
|
||
removed the sections being deleted.
|
||
Returns the old size. */
|
||
|
||
static int
|
||
resize_section_table (struct target_section_table *table, int adjustment)
|
||
{
|
||
int old_count;
|
||
int new_count;
|
||
|
||
old_count = table->sections_end - table->sections;
|
||
|
||
new_count = adjustment + old_count;
|
||
|
||
if (new_count)
|
||
{
|
||
table->sections = XRESIZEVEC (struct target_section, table->sections,
|
||
new_count);
|
||
table->sections_end = table->sections + new_count;
|
||
}
|
||
else
|
||
clear_section_table (table);
|
||
|
||
return old_count;
|
||
}
|
||
|
||
/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
|
||
Returns 0 if OK, 1 on error. */
|
||
|
||
int
|
||
build_section_table (struct bfd *some_bfd, struct target_section **start,
|
||
struct target_section **end)
|
||
{
|
||
unsigned count;
|
||
|
||
count = bfd_count_sections (some_bfd);
|
||
if (*start)
|
||
xfree (* start);
|
||
*start = XNEWVEC (struct target_section, count);
|
||
*end = *start;
|
||
bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end);
|
||
if (*end > *start + count)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("failed internal consistency check"));
|
||
/* We could realloc the table, but it probably loses for most files. */
|
||
return 0;
|
||
}
|
||
|
||
/* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
|
||
current set of target sections. */
|
||
|
||
void
|
||
add_target_sections (void *owner,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end)
|
||
{
|
||
int count;
|
||
struct target_section_table *table = current_target_sections;
|
||
|
||
count = sections_end - sections;
|
||
|
||
if (count > 0)
|
||
{
|
||
int space = resize_section_table (table, count);
|
||
int i;
|
||
|
||
for (i = 0; i < count; ++i)
|
||
{
|
||
table->sections[space + i] = sections[i];
|
||
table->sections[space + i].owner = owner;
|
||
}
|
||
|
||
/* If these are the first file sections we can provide memory
|
||
from, push the file_stratum target. */
|
||
if (!target_is_pushed (&exec_ops))
|
||
push_target (&exec_ops);
|
||
}
|
||
}
|
||
|
||
/* Add the sections of OBJFILE to the current set of target sections. */
|
||
|
||
void
|
||
add_target_sections_of_objfile (struct objfile *objfile)
|
||
{
|
||
struct target_section_table *table = current_target_sections;
|
||
struct obj_section *osect;
|
||
int space;
|
||
unsigned count = 0;
|
||
struct target_section *ts;
|
||
|
||
if (objfile == NULL)
|
||
return;
|
||
|
||
/* Compute the number of sections to add. */
|
||
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
||
{
|
||
if (bfd_get_section_size (osect->the_bfd_section) == 0)
|
||
continue;
|
||
count++;
|
||
}
|
||
|
||
if (count == 0)
|
||
return;
|
||
|
||
space = resize_section_table (table, count);
|
||
|
||
ts = table->sections + space;
|
||
|
||
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
||
{
|
||
if (bfd_get_section_size (osect->the_bfd_section) == 0)
|
||
continue;
|
||
|
||
gdb_assert (ts < table->sections + space + count);
|
||
|
||
ts->addr = obj_section_addr (osect);
|
||
ts->endaddr = obj_section_endaddr (osect);
|
||
ts->the_bfd_section = osect->the_bfd_section;
|
||
ts->owner = (void *) objfile;
|
||
|
||
ts++;
|
||
}
|
||
}
|
||
|
||
/* Remove all target sections owned by OWNER.
|
||
OWNER must be the same value passed to add_target_sections. */
|
||
|
||
void
|
||
remove_target_sections (void *owner)
|
||
{
|
||
struct target_section *src, *dest;
|
||
struct target_section_table *table = current_target_sections;
|
||
|
||
gdb_assert (owner != NULL);
|
||
|
||
dest = table->sections;
|
||
for (src = table->sections; src < table->sections_end; src++)
|
||
if (src->owner != owner)
|
||
{
|
||
/* Keep this section. */
|
||
if (dest < src)
|
||
*dest = *src;
|
||
dest++;
|
||
}
|
||
|
||
/* If we've dropped any sections, resize the section table. */
|
||
if (dest < src)
|
||
{
|
||
int old_count;
|
||
|
||
old_count = resize_section_table (table, dest - src);
|
||
|
||
/* If we don't have any more sections to read memory from,
|
||
remove the file_stratum target from the stack. */
|
||
if (old_count + (dest - src) == 0)
|
||
{
|
||
struct program_space *pspace;
|
||
|
||
ALL_PSPACES (pspace)
|
||
if (pspace->target_sections.sections
|
||
!= pspace->target_sections.sections_end)
|
||
return;
|
||
|
||
unpush_target (&exec_ops);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
|
||
enum target_xfer_status
|
||
exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset,
|
||
ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
/* It's unduly pedantic to refuse to look at the executable for
|
||
read-only pieces; so do the equivalent of readonly regions aka
|
||
QTro packet. */
|
||
if (exec_bfd != NULL)
|
||
{
|
||
asection *s;
|
||
bfd_size_type size;
|
||
bfd_vma vma;
|
||
|
||
for (s = exec_bfd->sections; s; s = s->next)
|
||
{
|
||
if ((s->flags & SEC_LOAD) == 0
|
||
|| (s->flags & SEC_READONLY) == 0)
|
||
continue;
|
||
|
||
vma = s->vma;
|
||
size = bfd_get_section_size (s);
|
||
if (vma <= offset && offset < (vma + size))
|
||
{
|
||
ULONGEST amt;
|
||
|
||
amt = (vma + size) - offset;
|
||
if (amt > len)
|
||
amt = len;
|
||
|
||
amt = bfd_get_section_contents (exec_bfd, s,
|
||
readbuf, offset - vma, amt);
|
||
|
||
if (amt == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
{
|
||
*xfered_len = amt;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Indicate failure to find the requested memory block. */
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
/* Return all read-only memory ranges found in the target section
|
||
table defined by SECTIONS and SECTIONS_END, starting at (and
|
||
intersected with) MEMADDR for LEN bytes. */
|
||
|
||
static std::vector<mem_range>
|
||
section_table_available_memory (CORE_ADDR memaddr, ULONGEST len,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end)
|
||
{
|
||
std::vector<mem_range> memory;
|
||
|
||
for (target_section *p = sections; p < sections_end; p++)
|
||
{
|
||
if ((bfd_get_section_flags (p->the_bfd_section->owner,
|
||
p->the_bfd_section)
|
||
& SEC_READONLY) == 0)
|
||
continue;
|
||
|
||
/* Copy the meta-data, adjusted. */
|
||
if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len))
|
||
{
|
||
ULONGEST lo1, hi1, lo2, hi2;
|
||
|
||
lo1 = memaddr;
|
||
hi1 = memaddr + len;
|
||
|
||
lo2 = p->addr;
|
||
hi2 = p->endaddr;
|
||
|
||
CORE_ADDR start = std::max (lo1, lo2);
|
||
int length = std::min (hi1, hi2) - start;
|
||
|
||
memory.emplace_back (start, length);
|
||
}
|
||
}
|
||
|
||
return memory;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset,
|
||
ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
target_section_table *table = target_get_section_table (&exec_ops);
|
||
std::vector<mem_range> available_memory
|
||
= section_table_available_memory (offset, len,
|
||
table->sections, table->sections_end);
|
||
|
||
normalize_mem_ranges (&available_memory);
|
||
|
||
for (const mem_range &r : available_memory)
|
||
{
|
||
if (mem_ranges_overlap (r.start, r.length, offset, len))
|
||
{
|
||
CORE_ADDR end;
|
||
enum target_xfer_status status;
|
||
|
||
/* Get the intersection window. */
|
||
end = std::min<CORE_ADDR> (offset + len, r.start + r.length);
|
||
|
||
gdb_assert (end - offset <= len);
|
||
|
||
if (offset >= r.start)
|
||
status = exec_read_partial_read_only (readbuf, offset,
|
||
end - offset,
|
||
xfered_len);
|
||
else
|
||
{
|
||
*xfered_len = r.start - offset;
|
||
status = TARGET_XFER_UNAVAILABLE;
|
||
}
|
||
return status;
|
||
}
|
||
}
|
||
|
||
*xfered_len = len;
|
||
return TARGET_XFER_UNAVAILABLE;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len,
|
||
ULONGEST *xfered_len,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end,
|
||
const char *section_name)
|
||
{
|
||
int res;
|
||
struct target_section *p;
|
||
ULONGEST memaddr = offset;
|
||
ULONGEST memend = memaddr + len;
|
||
|
||
if (len == 0)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("failed internal consistency check"));
|
||
|
||
for (p = sections; p < sections_end; p++)
|
||
{
|
||
struct bfd_section *asect = p->the_bfd_section;
|
||
bfd *abfd = asect->owner;
|
||
|
||
if (section_name && strcmp (section_name, asect->name) != 0)
|
||
continue; /* not the section we need. */
|
||
if (memaddr >= p->addr)
|
||
{
|
||
if (memend <= p->endaddr)
|
||
{
|
||
/* Entire transfer is within this section. */
|
||
if (writebuf)
|
||
res = bfd_set_section_contents (abfd, asect,
|
||
writebuf, memaddr - p->addr,
|
||
len);
|
||
else
|
||
res = bfd_get_section_contents (abfd, asect,
|
||
readbuf, memaddr - p->addr,
|
||
len);
|
||
|
||
if (res != 0)
|
||
{
|
||
*xfered_len = len;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
else
|
||
return TARGET_XFER_EOF;
|
||
}
|
||
else if (memaddr >= p->endaddr)
|
||
{
|
||
/* This section ends before the transfer starts. */
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
/* This section overlaps the transfer. Just do half. */
|
||
len = p->endaddr - memaddr;
|
||
if (writebuf)
|
||
res = bfd_set_section_contents (abfd, asect,
|
||
writebuf, memaddr - p->addr,
|
||
len);
|
||
else
|
||
res = bfd_get_section_contents (abfd, asect,
|
||
readbuf, memaddr - p->addr,
|
||
len);
|
||
if (res != 0)
|
||
{
|
||
*xfered_len = len;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
else
|
||
return TARGET_XFER_EOF;
|
||
}
|
||
}
|
||
}
|
||
|
||
return TARGET_XFER_EOF; /* We can't help. */
|
||
}
|
||
|
||
struct target_section_table *
|
||
exec_target::get_section_table ()
|
||
{
|
||
return current_target_sections;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
exec_target::xfer_partial (enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
struct target_section_table *table = get_section_table ();
|
||
|
||
if (object == TARGET_OBJECT_MEMORY)
|
||
return section_table_xfer_memory_partial (readbuf, writebuf,
|
||
offset, len, xfered_len,
|
||
table->sections,
|
||
table->sections_end,
|
||
NULL);
|
||
else
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
|
||
void
|
||
print_section_info (struct target_section_table *t, bfd *abfd)
|
||
{
|
||
struct gdbarch *gdbarch = gdbarch_from_bfd (abfd);
|
||
struct target_section *p;
|
||
/* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
|
||
int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16;
|
||
|
||
printf_filtered ("\t`%s', ", bfd_get_filename (abfd));
|
||
wrap_here (" ");
|
||
printf_filtered (_("file type %s.\n"), bfd_get_target (abfd));
|
||
if (abfd == exec_bfd)
|
||
{
|
||
/* gcc-3.4 does not like the initialization in
|
||
<p == t->sections_end>. */
|
||
bfd_vma displacement = 0;
|
||
bfd_vma entry_point;
|
||
|
||
for (p = t->sections; p < t->sections_end; p++)
|
||
{
|
||
struct bfd_section *psect = p->the_bfd_section;
|
||
bfd *pbfd = psect->owner;
|
||
|
||
if ((bfd_get_section_flags (pbfd, psect) & (SEC_ALLOC | SEC_LOAD))
|
||
!= (SEC_ALLOC | SEC_LOAD))
|
||
continue;
|
||
|
||
if (bfd_get_section_vma (pbfd, psect) <= abfd->start_address
|
||
&& abfd->start_address < (bfd_get_section_vma (pbfd, psect)
|
||
+ bfd_get_section_size (psect)))
|
||
{
|
||
displacement = p->addr - bfd_get_section_vma (pbfd, psect);
|
||
break;
|
||
}
|
||
}
|
||
if (p == t->sections_end)
|
||
warning (_("Cannot find section for the entry point of %s."),
|
||
bfd_get_filename (abfd));
|
||
|
||
entry_point = gdbarch_addr_bits_remove (gdbarch,
|
||
bfd_get_start_address (abfd)
|
||
+ displacement);
|
||
printf_filtered (_("\tEntry point: %s\n"),
|
||
paddress (gdbarch, entry_point));
|
||
}
|
||
for (p = t->sections; p < t->sections_end; p++)
|
||
{
|
||
struct bfd_section *psect = p->the_bfd_section;
|
||
bfd *pbfd = psect->owner;
|
||
|
||
printf_filtered ("\t%s", hex_string_custom (p->addr, wid));
|
||
printf_filtered (" - %s", hex_string_custom (p->endaddr, wid));
|
||
|
||
/* FIXME: A format of "08l" is not wide enough for file offsets
|
||
larger than 4GB. OTOH, making it "016l" isn't desirable either
|
||
since most output will then be much wider than necessary. It
|
||
may make sense to test the size of the file and choose the
|
||
format string accordingly. */
|
||
/* FIXME: i18n: Need to rewrite this sentence. */
|
||
if (info_verbose)
|
||
printf_filtered (" @ %s",
|
||
hex_string_custom (psect->filepos, 8));
|
||
printf_filtered (" is %s", bfd_section_name (pbfd, psect));
|
||
if (pbfd != abfd)
|
||
printf_filtered (" in %s", bfd_get_filename (pbfd));
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
void
|
||
exec_target::files_info ()
|
||
{
|
||
if (exec_bfd)
|
||
print_section_info (current_target_sections, exec_bfd);
|
||
else
|
||
puts_filtered (_("\t<no file loaded>\n"));
|
||
}
|
||
|
||
static void
|
||
set_section_command (const char *args, int from_tty)
|
||
{
|
||
struct target_section *p;
|
||
const char *secname;
|
||
unsigned seclen;
|
||
unsigned long secaddr;
|
||
char secprint[100];
|
||
long offset;
|
||
struct target_section_table *table;
|
||
|
||
if (args == 0)
|
||
error (_("Must specify section name and its virtual address"));
|
||
|
||
/* Parse out section name. */
|
||
for (secname = args; !isspace (*args); args++);
|
||
seclen = args - secname;
|
||
|
||
/* Parse out new virtual address. */
|
||
secaddr = parse_and_eval_address (args);
|
||
|
||
table = current_target_sections;
|
||
for (p = table->sections; p < table->sections_end; p++)
|
||
{
|
||
if (!strncmp (secname, bfd_section_name (p->bfd,
|
||
p->the_bfd_section), seclen)
|
||
&& bfd_section_name (p->bfd, p->the_bfd_section)[seclen] == '\0')
|
||
{
|
||
offset = secaddr - p->addr;
|
||
p->addr += offset;
|
||
p->endaddr += offset;
|
||
if (from_tty)
|
||
exec_ops.files_info ();
|
||
return;
|
||
}
|
||
}
|
||
if (seclen >= sizeof (secprint))
|
||
seclen = sizeof (secprint) - 1;
|
||
strncpy (secprint, secname, seclen);
|
||
secprint[seclen] = '\0';
|
||
error (_("Section %s not found"), secprint);
|
||
}
|
||
|
||
/* If we can find a section in FILENAME with BFD index INDEX, adjust
|
||
it to ADDRESS. */
|
||
|
||
void
|
||
exec_set_section_address (const char *filename, int index, CORE_ADDR address)
|
||
{
|
||
struct target_section *p;
|
||
struct target_section_table *table;
|
||
|
||
table = current_target_sections;
|
||
for (p = table->sections; p < table->sections_end; p++)
|
||
{
|
||
if (filename_cmp (filename, p->the_bfd_section->owner->filename) == 0
|
||
&& index == p->the_bfd_section->index)
|
||
{
|
||
p->endaddr += address - p->addr;
|
||
p->addr = address;
|
||
}
|
||
}
|
||
}
|
||
|
||
bool
|
||
exec_target::has_memory ()
|
||
{
|
||
/* We can provide memory if we have any file/target sections to read
|
||
from. */
|
||
return (current_target_sections->sections
|
||
!= current_target_sections->sections_end);
|
||
}
|
||
|
||
char *
|
||
exec_target::make_corefile_notes (bfd *obfd, int *note_size)
|
||
{
|
||
error (_("Can't create a corefile"));
|
||
}
|
||
|
||
int
|
||
exec_target::find_memory_regions (find_memory_region_ftype func, void *data)
|
||
{
|
||
return objfile_find_memory_regions (this, func, data);
|
||
}
|
||
|
||
void
|
||
_initialize_exec (void)
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
if (!dbx_commands)
|
||
{
|
||
c = add_cmd ("file", class_files, file_command, _("\
|
||
Use FILE as program to be debugged.\n\
|
||
It is read for its symbols, for getting the contents of pure memory,\n\
|
||
and it is the program executed when you use the `run' command.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
($PATH) is searched for a command of that name.\n\
|
||
No arg means to have no executable file and no symbols."), &cmdlist);
|
||
set_cmd_completer (c, filename_completer);
|
||
}
|
||
|
||
c = add_cmd ("exec-file", class_files, exec_file_command, _("\
|
||
Use FILE as program for getting contents of pure memory.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
is searched for a command of that name.\n\
|
||
No arg means have no executable file."), &cmdlist);
|
||
set_cmd_completer (c, filename_completer);
|
||
|
||
add_com ("section", class_files, set_section_command, _("\
|
||
Change the base address of section SECTION of the exec file to ADDR.\n\
|
||
This can be used if the exec file does not contain section addresses,\n\
|
||
(such as in the a.out format), or when the addresses specified in the\n\
|
||
file itself are wrong. Each section must be changed separately. The\n\
|
||
``info files'' command lists all the sections and their addresses."));
|
||
|
||
add_setshow_boolean_cmd ("write", class_support, &write_files, _("\
|
||
Set writing into executable and core files."), _("\
|
||
Show writing into executable and core files."), NULL,
|
||
NULL,
|
||
show_write_files,
|
||
&setlist, &showlist);
|
||
|
||
add_target (exec_target_info, exec_target_open, filename_completer);
|
||
}
|