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d9f719f1ad
Currently, to open a target, with "target TARGET_NAME", GDB finds the target_ops instance with "TARGET_NAME" as short name, and then calls its target_ops::open virtual method. In reality, there's no actual target/name lookup, a pointer to the target_ops object was associated with the "target TARGET_NAME" command at add_target time (when GDB is initialized), as the command's context. This creates a chicken and egg situation. Consider the case of wanting to open multiple remote connections. We want to be able to have one remote target_ops instance per connection, but, if we're not connected yet, so we don't yet have an instance to call target->open() on... This patch fixes this by separating out common info about a target_ops to a separate structure (shortname, longname, doc), and changing the add_target routine to take a reference to such an object instead of a pointer to a target_ops, and a pointer to a factory function that is responsible to open an instance of the corresponding target when the user types "target TARGET_NAME". -extern void add_target (struct target_ops *); +extern void add_target (const target_info &info, target_open_ftype *func); I.e. this factory function replaces the target_ops::open virtual method. For static/singleton targets, nothing changes, the target_open_ftype function pushes the global target_ops instance on the target stack. At target_close time, the connection is tor down, but the global target_ops object remains live. However, targets that support being open multiple times will make their target_open_ftype routine allocate a new target_ops instance on the heap [e.g., new remote_target()], and push that on the stack. At target_close time, the new object is destroyed (by the target_ops::close virtual method). Both the core target and the remote targets will support being open multiple times (others could/should too, but those were my stopping point), but not in this patch yet. We need to get rid of more globals first before that'd be useful. Native targets are somewhat special, given find_default_run_target & friends. Those routines also expect to return a target_ops pointer, even before we've open the target. However, we'll never need more than one instance of the native target, so we can assume/require that native targets are global/simpletons, and have the backends register a pointer to the native target_ops. Since all native targets inherit inf_child_target, we can centralize that registration. See add_inf_child_target, get_native_target/set_native_target and find_default_run_target. gdb/ChangeLog: 2018-05-02 Pedro Alves <palves@redhat.com> * aarch64-fbsd-nat.c (_initialize_aarch64_fbsd_nat): Use add_inf_child_target. * aarch64-linux-nat.c (_initialize_aarch64_linux_nat): Use add_inf_child_target. * aix-thread.c (aix_thread_target_info): New. (aix_thread_target) <shortname, longname, doc>: Delete. <info>: New. * alpha-bsd-nat.c (_initialize_alphabsd_nat): Use add_inf_child_target. * alpha-linux-nat.c (_initialize_alpha_linux_nat): Use add_inf_child_target. * amd64-fbsd-nat.c (_initialize_amd64fbsd_nat): Use add_inf_child_target. * amd64-linux-nat.c (_initialize_amd64_linux_nat): Use add_inf_child_target. * amd64-nbsd-nat.c (_initialize_amd64nbsd_nat): Use add_inf_child_target. * amd64-obsd-nat.c (_initialize_amd64obsd_nat): Use add_inf_child_target. * arm-fbsd-nat.c (_initialize_arm_fbsd_nat): Use add_inf_child_target. * arm-linux-nat.c (_initialize_arm_linux_nat): Use add_inf_child_target. * arm-nbsd-nat.c (_initialize_arm_netbsd_nat): Use add_inf_child_target. * bfd-target.c (target_bfd_target_info): New. (target_bfd) <shortname, longname, doc>: Delete. <info>: New. * bsd-kvm.c (bsd_kvm_target_info): New. (bsd_kvm_target) <shortname, longname, doc>: Delete. <info>: New. (bsd_kvm_target::open): Rename to ... (bsd_kvm_target_open): ... this. Adjust. * bsd-uthread.c (bsd_uthread_target_info): New. (bsd_uthread_target) <shortname, longname, doc>: Delete. <info>: New. * corefile.c (core_file_command): Adjust. * corelow.c (core_target_info): New. (core_target) <shortname, longname, doc>: Delete. <info>: New. (core_target::open): Rename to ... (core_target_open): ... this. Adjust. * ctf.c (ctf_target_info): New. (ctf_target) <shortname, longname, doc>: Delete. <info>: New. (ctf_target::open): Rename to ... (ctf_target_open): ... this. (_initialize_ctf): Adjust. * exec.c (exec_target_info): New. (exec_target) <shortname, longname, doc>: Delete. <info>: New. (exec_target::open): Rename to ... (exec_target_open): ... this. * gdbcore.h (core_target_open): Declare. * go32-nat.c (_initialize_go32_nat): Use add_inf_child_target. * hppa-linux-nat.c (_initialize_hppa_linux_nat): Use add_inf_child_target. * hppa-nbsd-nat.c (_initialize_hppanbsd_nat): Use add_inf_child_target. * hppa-obsd-nat.c (_initialize_hppaobsd_nat): Use add_inf_child_target. * i386-darwin-nat.c (_initialize_i386_darwin_nat): Use add_inf_child_target. * i386-fbsd-nat.c (_initialize_i386fbsd_nat): Use add_inf_child_target. * i386-gnu-nat.c (_initialize_i386gnu_nat): Use add_inf_child_target. * i386-linux-nat.c (_initialize_i386_linux_nat): Use add_inf_child_target. * i386-nbsd-nat.c (_initialize_i386nbsd_nat): Use add_inf_child_target. * i386-obsd-nat.c (_initialize_i386obsd_nat): Use add_inf_child_target. * ia64-linux-nat.c (_initialize_ia64_linux_nat): Use add_inf_child_target. * inf-child.c (inf_child_target_info): New. (inf_child_target::info): New. (inf_child_open_target): Remove 'target' parameter. Use get_native_target instead. (inf_child_target::open): Delete. (add_inf_child_target): New. * inf-child.h (inf_child_target) <shortname, longname, doc, open>: Delete. <info>: New. (add_inf_child_target): Declare. (inf_child_open_target): Declare. * linux-thread-db.c (thread_db_target_info): New. (thread_db_target) <shortname, longname, doc>: Delete. <info>: New. * m32r-linux-nat.c (_initialize_m32r_linux_nat): Use add_inf_child_target. * m68k-bsd-nat.c (_initialize_m68kbsd_nat): Use add_inf_child_target. * m68k-linux-nat.c (_initialize_m68k_linux_nat): Use add_inf_child_target. * m88k-bsd-nat.c (_initialize_m88kbsd_nat): Use add_inf_child_target. * make-target-delegates (print_class): Adjust. * mips-fbsd-nat.c (_initialize_mips_fbsd_nat): Use add_inf_child_target. * mips-linux-nat.c (_initialize_mips_linux_nat): Use add_inf_child_target. * mips-nbsd-nat.c (_initialize_mipsnbsd_nat): Use add_inf_child_target. * mips64-obsd-nat.c (_initialize_mips64obsd_nat): Use add_inf_child_target. * nto-procfs.c (nto_native_target_info): New. (nto_procfs_target_native) <shortname, longname, doc>: Delete. <info>: New. (nto_procfs_target_info): New. (nto_procfs_target_procfs) <shortname, longname, doc>: Delete. <info>: New. (init_procfs_targets): Adjust. * ppc-fbsd-nat.c (_initialize_ppcfbsd_nat): Use add_inf_child_target. * ppc-linux-nat.c (_initialize_ppc_linux_nat): Use add_inf_child_target. * ppc-nbsd-nat.c (_initialize_ppcnbsd_nat): Use add_inf_child_target. * ppc-obsd-nat.c (_initialize_ppcobsd_nat): Use add_inf_child_target. * ravenscar-thread.c (ravenscar_target_info): New. (ravenscar_thread_target) <shortname, longname, doc>: Delete. <info>: New. * record-btrace.c (record_btrace_target_info): (record_btrace_target) <shortname, longname, doc>: Delete. <info>: New. (record_btrace_target::open): Rename to ... (record_btrace_target_open): ... this. Adjust. * record-full.c (record_longname, record_doc): New. (record_full_base_target) <shortname, longname, doc>: Delete. <info>: New. (record_full_target_info): New. (record_full_target): <shortname>: Delete. <info>: New. (record_full_core_open_1, record_full_open_1): Update comments. (record_full_base_target::open): Rename to ... (record_full_open): ... this. (cmd_record_full_restore): Update. (_initialize_record_full): Update. * remote-sim.c (remote_sim_target_info): New. (gdbsim_target) <shortname, longname, doc>: Delete. <info>: New. (gdbsim_target::open): Rename to ... (gdbsim_target_open): ... this. (_initialize_remote_sim): Adjust. * remote.c (remote_doc): New. (remote_target_info): New. (remote_target) <shortname, longname, doc>: Delete. <info>: New. (extended_remote_target_info): New. (extended_remote_target) <shortname, longname, doc>: Delete. <info>: New. (remote_target::open_1): Make static. Adjust. * rs6000-nat.c (_initialize_rs6000_nat): Use add_inf_child_target. * s390-linux-nat.c (_initialize_s390_nat): Use add_inf_child_target. * sh-nbsd-nat.c (_initialize_shnbsd_nat): Use add_inf_child_target. * sol-thread.c (thread_db_target_info): New. (sol_thread_target) <shortname, longname, doc>: Delete. <info>: New. * sparc-linux-nat.c (_initialize_sparc_linux_nat): Use add_inf_child_target. * sparc-nbsd-nat.c (_initialize_sparcnbsd_nat): Use add_inf_child_target. * sparc64-fbsd-nat.c (_initialize_sparc64fbsd_nat): Use add_inf_child_target. * sparc64-linux-nat.c (_initialize_sparc64_linux_nat): Use add_inf_child_target. * sparc64-nbsd-nat.c (_initialize_sparc64nbsd_nat): Use add_inf_child_target. * sparc64-obsd-nat.c (_initialize_sparc64obsd_nat): Use add_inf_child_target. * spu-linux-nat.c (_initialize_spu_nat): Use add_inf_child_target. * spu-multiarch.c (spu_multiarch_target_info): New. (spu_multiarch_target) <shortname, longname, doc>: Delete. <info>: New. * target-delegates.c: Regenerate. * target.c: Include <unordered_map>. (target_ops_p): Delete. (DEF_VEC_P(target_ops_p)): Delete. (target_factories): New. (test_target_info): New. (test_target_ops::info): New. (open_target): Adjust to use target_factories. (add_target_with_completer): Rename to ... (add_target): ... this. Change prototype. Register target_info and open callback in target_factories. Register target_info in command context instead of target_ops. (add_target): Delete old implementation. (add_deprecated_target_alias): Change prototype. Adjust. (the_native_target): New. (set_native_target, get_native_target): New. (find_default_run_target): Use the_native_target. (find_attach_target, find_run_target): Simplify. (target_ops::open): Delete. (dummy_target_info): New. (dummy_target::shortname, dummy_target::longname) (dummy_target::doc): Delete. (dummy_target::info): New. (debug_target::shortname, debug_target::longname) (debug_target::doc): Delete. (debug_target::info): New. * target.h (struct target_info): New. (target_ops::~target_ops): Add comment. (target_ops::info): New. (target_ops::shortname, target_ops::longname, target_ops::doc): No longer virtual. Implement in terms of target_info. (set_native_target, get_native_target): Declare. (target_open_ftype): New. (add_target, add_target_with_completer) (add_deprecated_target_alias): Change prototype. (test_target) <shortname, longname, doc>: Delete. <info>: New. * tilegx-linux-nat.c (_initialize_tile_linux_nat): Use add_inf_child_target. * tracefile-tfile.c (tfile_target_info): New. (tfile_target) <shortname, longname, doc>: Delete. <info>: New. (tfile_target::open): Rename to ... (tfile_target_open): ... this. (_initialize_tracefile_tfile): Adjust. * vax-bsd-nat.c (_initialize_vaxbsd_nat): Use add_inf_child_target. * windows-nat.c (_initialize_windows_nat): Use add_inf_child_target. * xtensa-linux-nat.c (_initialize_xtensa_linux_nat): Use add_inf_child_target.
2908 lines
82 KiB
C
2908 lines
82 KiB
C
/* Process record and replay target for GDB, the GNU debugger.
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Copyright (C) 2013-2018 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 "gdbcmd.h"
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#include "regcache.h"
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#include "gdbthread.h"
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#include "event-top.h"
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#include "completer.h"
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#include "arch-utils.h"
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#include "gdbcore.h"
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#include "exec.h"
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#include "record.h"
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#include "record-full.h"
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#include "elf-bfd.h"
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#include "gcore.h"
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#include "event-loop.h"
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#include "inf-loop.h"
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#include "gdb_bfd.h"
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#include "observable.h"
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#include "infrun.h"
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#include "common/gdb_unlinker.h"
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#include "common/byte-vector.h"
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#include <signal.h>
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/* This module implements "target record-full", also known as "process
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record and replay". This target sits on top of a "normal" target
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(a target that "has execution"), and provides a record and replay
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functionality, including reverse debugging.
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Target record has two modes: recording, and replaying.
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In record mode, we intercept the resume and wait methods.
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Whenever gdb resumes the target, we run the target in single step
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mode, and we build up an execution log in which, for each executed
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instruction, we record all changes in memory and register state.
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This is invisible to the user, to whom it just looks like an
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ordinary debugging session (except for performance degredation).
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In replay mode, instead of actually letting the inferior run as a
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process, we simulate its execution by playing back the recorded
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execution log. For each instruction in the log, we simulate the
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instruction's side effects by duplicating the changes that it would
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have made on memory and registers. */
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#define DEFAULT_RECORD_FULL_INSN_MAX_NUM 200000
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#define RECORD_FULL_IS_REPLAY \
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(record_full_list->next || ::execution_direction == EXEC_REVERSE)
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#define RECORD_FULL_FILE_MAGIC netorder32(0x20091016)
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/* These are the core structs of the process record functionality.
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A record_full_entry is a record of the value change of a register
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("record_full_reg") or a part of memory ("record_full_mem"). And each
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instruction must have a struct record_full_entry ("record_full_end")
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that indicates that this is the last struct record_full_entry of this
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instruction.
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Each struct record_full_entry is linked to "record_full_list" by "prev"
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and "next" pointers. */
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struct record_full_mem_entry
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{
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CORE_ADDR addr;
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int len;
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/* Set this flag if target memory for this entry
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can no longer be accessed. */
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int mem_entry_not_accessible;
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union
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{
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gdb_byte *ptr;
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gdb_byte buf[sizeof (gdb_byte *)];
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} u;
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};
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struct record_full_reg_entry
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{
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unsigned short num;
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unsigned short len;
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union
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{
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gdb_byte *ptr;
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gdb_byte buf[2 * sizeof (gdb_byte *)];
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} u;
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};
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struct record_full_end_entry
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{
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enum gdb_signal sigval;
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ULONGEST insn_num;
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};
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enum record_full_type
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{
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record_full_end = 0,
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record_full_reg,
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record_full_mem
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};
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/* This is the data structure that makes up the execution log.
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The execution log consists of a single linked list of entries
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of type "struct record_full_entry". It is doubly linked so that it
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can be traversed in either direction.
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The start of the list is anchored by a struct called
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"record_full_first". The pointer "record_full_list" either points
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to the last entry that was added to the list (in record mode), or to
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the next entry in the list that will be executed (in replay mode).
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Each list element (struct record_full_entry), in addition to next
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and prev pointers, consists of a union of three entry types: mem,
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reg, and end. A field called "type" determines which entry type is
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represented by a given list element.
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Each instruction that is added to the execution log is represented
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by a variable number of list elements ('entries'). The instruction
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will have one "reg" entry for each register that is changed by
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executing the instruction (including the PC in every case). It
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will also have one "mem" entry for each memory change. Finally,
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each instruction will have an "end" entry that separates it from
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the changes associated with the next instruction. */
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struct record_full_entry
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{
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struct record_full_entry *prev;
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struct record_full_entry *next;
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enum record_full_type type;
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union
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{
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/* reg */
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struct record_full_reg_entry reg;
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/* mem */
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struct record_full_mem_entry mem;
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/* end */
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struct record_full_end_entry end;
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} u;
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};
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/* If true, query if PREC cannot record memory
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change of next instruction. */
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int record_full_memory_query = 0;
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struct record_full_core_buf_entry
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{
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struct record_full_core_buf_entry *prev;
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struct target_section *p;
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bfd_byte *buf;
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};
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/* Record buf with core target. */
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static detached_regcache *record_full_core_regbuf = NULL;
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static struct target_section *record_full_core_start;
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static struct target_section *record_full_core_end;
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static struct record_full_core_buf_entry *record_full_core_buf_list = NULL;
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/* The following variables are used for managing the linked list that
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represents the execution log.
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record_full_first is the anchor that holds down the beginning of
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the list.
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record_full_list serves two functions:
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1) In record mode, it anchors the end of the list.
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2) In replay mode, it traverses the list and points to
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the next instruction that must be emulated.
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record_full_arch_list_head and record_full_arch_list_tail are used
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to manage a separate list, which is used to build up the change
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elements of the currently executing instruction during record mode.
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When this instruction has been completely annotated in the "arch
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list", it will be appended to the main execution log. */
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static struct record_full_entry record_full_first;
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static struct record_full_entry *record_full_list = &record_full_first;
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static struct record_full_entry *record_full_arch_list_head = NULL;
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static struct record_full_entry *record_full_arch_list_tail = NULL;
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/* 1 ask user. 0 auto delete the last struct record_full_entry. */
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static int record_full_stop_at_limit = 1;
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/* Maximum allowed number of insns in execution log. */
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static unsigned int record_full_insn_max_num
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= DEFAULT_RECORD_FULL_INSN_MAX_NUM;
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/* Actual count of insns presently in execution log. */
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static unsigned int record_full_insn_num = 0;
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/* Count of insns logged so far (may be larger
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than count of insns presently in execution log). */
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static ULONGEST record_full_insn_count;
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static const char record_longname[]
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= N_("Process record and replay target");
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static const char record_doc[]
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= N_("Log program while executing and replay execution from log.");
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/* Base class implementing functionality common to both the
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"record-full" and "record-core" targets. */
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class record_full_base_target : public target_ops
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{
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public:
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record_full_base_target ()
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{ to_stratum = record_stratum; }
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const target_info &info () const override = 0;
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void close () override;
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void async (int) override;
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ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
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bool stopped_by_watchpoint () override;
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bool stopped_data_address (CORE_ADDR *) override;
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bool stopped_by_sw_breakpoint () override;
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bool supports_stopped_by_sw_breakpoint () override;
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bool stopped_by_hw_breakpoint () override;
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bool supports_stopped_by_hw_breakpoint () override;
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bool can_execute_reverse () override;
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/* Add bookmark target methods. */
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gdb_byte *get_bookmark (const char *, int) override;
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void goto_bookmark (const gdb_byte *, int) override;
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enum exec_direction_kind execution_direction () override;
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enum record_method record_method (ptid_t ptid) override;
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void info_record () override;
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void save_record (const char *filename) override;
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bool supports_delete_record () override;
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void delete_record () override;
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bool record_is_replaying (ptid_t ptid) override;
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bool record_will_replay (ptid_t ptid, int dir) override;
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void record_stop_replaying () override;
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void goto_record_begin () override;
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void goto_record_end () override;
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void goto_record (ULONGEST insn) override;
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};
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/* The "record-full" target. */
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static const target_info record_full_target_info = {
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"record-full",
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record_longname,
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record_doc,
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};
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class record_full_target final : public record_full_base_target
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{
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public:
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const target_info &info () const override
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{ return record_full_target_info; }
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void commit_resume () override;
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void resume (ptid_t, int, enum gdb_signal) override;
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void disconnect (const char *, int) override;
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void detach (inferior *, int) override;
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void mourn_inferior () override;
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void kill () override;
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void store_registers (struct regcache *, int) override;
|
|
enum target_xfer_status xfer_partial (enum target_object object,
|
|
const char *annex,
|
|
gdb_byte *readbuf,
|
|
const gdb_byte *writebuf,
|
|
ULONGEST offset, ULONGEST len,
|
|
ULONGEST *xfered_len) override;
|
|
int insert_breakpoint (struct gdbarch *,
|
|
struct bp_target_info *) override;
|
|
int remove_breakpoint (struct gdbarch *,
|
|
struct bp_target_info *,
|
|
enum remove_bp_reason) override;
|
|
};
|
|
|
|
/* The "record-core" target. */
|
|
|
|
static const target_info record_full_core_target_info = {
|
|
"record-core",
|
|
record_longname,
|
|
record_doc,
|
|
};
|
|
|
|
class record_full_core_target final : public record_full_base_target
|
|
{
|
|
public:
|
|
const target_info &info () const override
|
|
{ return record_full_core_target_info; }
|
|
|
|
void resume (ptid_t, int, enum gdb_signal) override;
|
|
void disconnect (const char *, int) override;
|
|
void kill () override;
|
|
void fetch_registers (struct regcache *regcache, int regno) override;
|
|
void prepare_to_store (struct regcache *regcache) override;
|
|
void store_registers (struct regcache *, int) override;
|
|
enum target_xfer_status xfer_partial (enum target_object object,
|
|
const char *annex,
|
|
gdb_byte *readbuf,
|
|
const gdb_byte *writebuf,
|
|
ULONGEST offset, ULONGEST len,
|
|
ULONGEST *xfered_len) override;
|
|
int insert_breakpoint (struct gdbarch *,
|
|
struct bp_target_info *) override;
|
|
int remove_breakpoint (struct gdbarch *,
|
|
struct bp_target_info *,
|
|
enum remove_bp_reason) override;
|
|
|
|
bool has_execution (ptid_t) override;
|
|
};
|
|
|
|
static record_full_target record_full_ops;
|
|
static record_full_core_target record_full_core_ops;
|
|
|
|
void
|
|
record_full_target::detach (inferior *inf, int from_tty)
|
|
{
|
|
record_detach (this, inf, from_tty);
|
|
}
|
|
|
|
void
|
|
record_full_target::disconnect (const char *args, int from_tty)
|
|
{
|
|
record_disconnect (this, args, from_tty);
|
|
}
|
|
|
|
void
|
|
record_full_core_target::disconnect (const char *args, int from_tty)
|
|
{
|
|
record_disconnect (this, args, from_tty);
|
|
}
|
|
|
|
void
|
|
record_full_target::mourn_inferior ()
|
|
{
|
|
record_mourn_inferior (this);
|
|
}
|
|
|
|
void
|
|
record_full_target::kill ()
|
|
{
|
|
record_kill (this);
|
|
}
|
|
|
|
/* See record-full.h. */
|
|
|
|
int
|
|
record_full_is_used (void)
|
|
{
|
|
struct target_ops *t;
|
|
|
|
t = find_record_target ();
|
|
return (t == &record_full_ops
|
|
|| t == &record_full_core_ops);
|
|
}
|
|
|
|
|
|
/* Command lists for "set/show record full". */
|
|
static struct cmd_list_element *set_record_full_cmdlist;
|
|
static struct cmd_list_element *show_record_full_cmdlist;
|
|
|
|
/* Command list for "record full". */
|
|
static struct cmd_list_element *record_full_cmdlist;
|
|
|
|
static void record_full_goto_insn (struct record_full_entry *entry,
|
|
enum exec_direction_kind dir);
|
|
|
|
/* Alloc and free functions for record_full_reg, record_full_mem, and
|
|
record_full_end entries. */
|
|
|
|
/* Alloc a record_full_reg record entry. */
|
|
|
|
static inline struct record_full_entry *
|
|
record_full_reg_alloc (struct regcache *regcache, int regnum)
|
|
{
|
|
struct record_full_entry *rec;
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
|
|
rec = XCNEW (struct record_full_entry);
|
|
rec->type = record_full_reg;
|
|
rec->u.reg.num = regnum;
|
|
rec->u.reg.len = register_size (gdbarch, regnum);
|
|
if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
|
|
rec->u.reg.u.ptr = (gdb_byte *) xmalloc (rec->u.reg.len);
|
|
|
|
return rec;
|
|
}
|
|
|
|
/* Free a record_full_reg record entry. */
|
|
|
|
static inline void
|
|
record_full_reg_release (struct record_full_entry *rec)
|
|
{
|
|
gdb_assert (rec->type == record_full_reg);
|
|
if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
|
|
xfree (rec->u.reg.u.ptr);
|
|
xfree (rec);
|
|
}
|
|
|
|
/* Alloc a record_full_mem record entry. */
|
|
|
|
static inline struct record_full_entry *
|
|
record_full_mem_alloc (CORE_ADDR addr, int len)
|
|
{
|
|
struct record_full_entry *rec;
|
|
|
|
rec = XCNEW (struct record_full_entry);
|
|
rec->type = record_full_mem;
|
|
rec->u.mem.addr = addr;
|
|
rec->u.mem.len = len;
|
|
if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
|
|
rec->u.mem.u.ptr = (gdb_byte *) xmalloc (len);
|
|
|
|
return rec;
|
|
}
|
|
|
|
/* Free a record_full_mem record entry. */
|
|
|
|
static inline void
|
|
record_full_mem_release (struct record_full_entry *rec)
|
|
{
|
|
gdb_assert (rec->type == record_full_mem);
|
|
if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
|
|
xfree (rec->u.mem.u.ptr);
|
|
xfree (rec);
|
|
}
|
|
|
|
/* Alloc a record_full_end record entry. */
|
|
|
|
static inline struct record_full_entry *
|
|
record_full_end_alloc (void)
|
|
{
|
|
struct record_full_entry *rec;
|
|
|
|
rec = XCNEW (struct record_full_entry);
|
|
rec->type = record_full_end;
|
|
|
|
return rec;
|
|
}
|
|
|
|
/* Free a record_full_end record entry. */
|
|
|
|
static inline void
|
|
record_full_end_release (struct record_full_entry *rec)
|
|
{
|
|
xfree (rec);
|
|
}
|
|
|
|
/* Free one record entry, any type.
|
|
Return entry->type, in case caller wants to know. */
|
|
|
|
static inline enum record_full_type
|
|
record_full_entry_release (struct record_full_entry *rec)
|
|
{
|
|
enum record_full_type type = rec->type;
|
|
|
|
switch (type) {
|
|
case record_full_reg:
|
|
record_full_reg_release (rec);
|
|
break;
|
|
case record_full_mem:
|
|
record_full_mem_release (rec);
|
|
break;
|
|
case record_full_end:
|
|
record_full_end_release (rec);
|
|
break;
|
|
}
|
|
return type;
|
|
}
|
|
|
|
/* Free all record entries in list pointed to by REC. */
|
|
|
|
static void
|
|
record_full_list_release (struct record_full_entry *rec)
|
|
{
|
|
if (!rec)
|
|
return;
|
|
|
|
while (rec->next)
|
|
rec = rec->next;
|
|
|
|
while (rec->prev)
|
|
{
|
|
rec = rec->prev;
|
|
record_full_entry_release (rec->next);
|
|
}
|
|
|
|
if (rec == &record_full_first)
|
|
{
|
|
record_full_insn_num = 0;
|
|
record_full_first.next = NULL;
|
|
}
|
|
else
|
|
record_full_entry_release (rec);
|
|
}
|
|
|
|
/* Free all record entries forward of the given list position. */
|
|
|
|
static void
|
|
record_full_list_release_following (struct record_full_entry *rec)
|
|
{
|
|
struct record_full_entry *tmp = rec->next;
|
|
|
|
rec->next = NULL;
|
|
while (tmp)
|
|
{
|
|
rec = tmp->next;
|
|
if (record_full_entry_release (tmp) == record_full_end)
|
|
{
|
|
record_full_insn_num--;
|
|
record_full_insn_count--;
|
|
}
|
|
tmp = rec;
|
|
}
|
|
}
|
|
|
|
/* Delete the first instruction from the beginning of the log, to make
|
|
room for adding a new instruction at the end of the log.
|
|
|
|
Note -- this function does not modify record_full_insn_num. */
|
|
|
|
static void
|
|
record_full_list_release_first (void)
|
|
{
|
|
struct record_full_entry *tmp;
|
|
|
|
if (!record_full_first.next)
|
|
return;
|
|
|
|
/* Loop until a record_full_end. */
|
|
while (1)
|
|
{
|
|
/* Cut record_full_first.next out of the linked list. */
|
|
tmp = record_full_first.next;
|
|
record_full_first.next = tmp->next;
|
|
tmp->next->prev = &record_full_first;
|
|
|
|
/* tmp is now isolated, and can be deleted. */
|
|
if (record_full_entry_release (tmp) == record_full_end)
|
|
break; /* End loop at first record_full_end. */
|
|
|
|
if (!record_full_first.next)
|
|
{
|
|
gdb_assert (record_full_insn_num == 1);
|
|
break; /* End loop when list is empty. */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Add a struct record_full_entry to record_full_arch_list. */
|
|
|
|
static void
|
|
record_full_arch_list_add (struct record_full_entry *rec)
|
|
{
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_arch_list_add %s.\n",
|
|
host_address_to_string (rec));
|
|
|
|
if (record_full_arch_list_tail)
|
|
{
|
|
record_full_arch_list_tail->next = rec;
|
|
rec->prev = record_full_arch_list_tail;
|
|
record_full_arch_list_tail = rec;
|
|
}
|
|
else
|
|
{
|
|
record_full_arch_list_head = rec;
|
|
record_full_arch_list_tail = rec;
|
|
}
|
|
}
|
|
|
|
/* Return the value storage location of a record entry. */
|
|
static inline gdb_byte *
|
|
record_full_get_loc (struct record_full_entry *rec)
|
|
{
|
|
switch (rec->type) {
|
|
case record_full_mem:
|
|
if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
|
|
return rec->u.mem.u.ptr;
|
|
else
|
|
return rec->u.mem.u.buf;
|
|
case record_full_reg:
|
|
if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
|
|
return rec->u.reg.u.ptr;
|
|
else
|
|
return rec->u.reg.u.buf;
|
|
case record_full_end:
|
|
default:
|
|
gdb_assert_not_reached ("unexpected record_full_entry type");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Record the value of a register NUM to record_full_arch_list. */
|
|
|
|
int
|
|
record_full_arch_list_add_reg (struct regcache *regcache, int regnum)
|
|
{
|
|
struct record_full_entry *rec;
|
|
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: add register num = %d to "
|
|
"record list.\n",
|
|
regnum);
|
|
|
|
rec = record_full_reg_alloc (regcache, regnum);
|
|
|
|
regcache_raw_read (regcache, regnum, record_full_get_loc (rec));
|
|
|
|
record_full_arch_list_add (rec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Record the value of a region of memory whose address is ADDR and
|
|
length is LEN to record_full_arch_list. */
|
|
|
|
int
|
|
record_full_arch_list_add_mem (CORE_ADDR addr, int len)
|
|
{
|
|
struct record_full_entry *rec;
|
|
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: add mem addr = %s len = %d to "
|
|
"record list.\n",
|
|
paddress (target_gdbarch (), addr), len);
|
|
|
|
if (!addr) /* FIXME: Why? Some arch must permit it... */
|
|
return 0;
|
|
|
|
rec = record_full_mem_alloc (addr, len);
|
|
|
|
if (record_read_memory (target_gdbarch (), addr,
|
|
record_full_get_loc (rec), len))
|
|
{
|
|
record_full_mem_release (rec);
|
|
return -1;
|
|
}
|
|
|
|
record_full_arch_list_add (rec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Add a record_full_end type struct record_full_entry to
|
|
record_full_arch_list. */
|
|
|
|
int
|
|
record_full_arch_list_add_end (void)
|
|
{
|
|
struct record_full_entry *rec;
|
|
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: add end to arch list.\n");
|
|
|
|
rec = record_full_end_alloc ();
|
|
rec->u.end.sigval = GDB_SIGNAL_0;
|
|
rec->u.end.insn_num = ++record_full_insn_count;
|
|
|
|
record_full_arch_list_add (rec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
record_full_check_insn_num (void)
|
|
{
|
|
if (record_full_insn_num == record_full_insn_max_num)
|
|
{
|
|
/* Ask user what to do. */
|
|
if (record_full_stop_at_limit)
|
|
{
|
|
if (!yquery (_("Do you want to auto delete previous execution "
|
|
"log entries when record/replay buffer becomes "
|
|
"full (record full stop-at-limit)?")))
|
|
error (_("Process record: stopped by user."));
|
|
record_full_stop_at_limit = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
record_full_arch_list_cleanups (void *ignore)
|
|
{
|
|
record_full_list_release (record_full_arch_list_tail);
|
|
}
|
|
|
|
/* Before inferior step (when GDB record the running message, inferior
|
|
only can step), GDB will call this function to record the values to
|
|
record_full_list. This function will call gdbarch_process_record to
|
|
record the running message of inferior and set them to
|
|
record_full_arch_list, and add it to record_full_list. */
|
|
|
|
static void
|
|
record_full_message (struct regcache *regcache, enum gdb_signal signal)
|
|
{
|
|
int ret;
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
struct cleanup *old_cleanups
|
|
= make_cleanup (record_full_arch_list_cleanups, 0);
|
|
|
|
record_full_arch_list_head = NULL;
|
|
record_full_arch_list_tail = NULL;
|
|
|
|
/* Check record_full_insn_num. */
|
|
record_full_check_insn_num ();
|
|
|
|
/* If gdb sends a signal value to target_resume,
|
|
save it in the 'end' field of the previous instruction.
|
|
|
|
Maybe process record should record what really happened,
|
|
rather than what gdb pretends has happened.
|
|
|
|
So if Linux delivered the signal to the child process during
|
|
the record mode, we will record it and deliver it again in
|
|
the replay mode.
|
|
|
|
If user says "ignore this signal" during the record mode, then
|
|
it will be ignored again during the replay mode (no matter if
|
|
the user says something different, like "deliver this signal"
|
|
during the replay mode).
|
|
|
|
User should understand that nothing he does during the replay
|
|
mode will change the behavior of the child. If he tries,
|
|
then that is a user error.
|
|
|
|
But we should still deliver the signal to gdb during the replay,
|
|
if we delivered it during the recording. Therefore we should
|
|
record the signal during record_full_wait, not
|
|
record_full_resume. */
|
|
if (record_full_list != &record_full_first) /* FIXME better way to check */
|
|
{
|
|
gdb_assert (record_full_list->type == record_full_end);
|
|
record_full_list->u.end.sigval = signal;
|
|
}
|
|
|
|
if (signal == GDB_SIGNAL_0
|
|
|| !gdbarch_process_record_signal_p (gdbarch))
|
|
ret = gdbarch_process_record (gdbarch,
|
|
regcache,
|
|
regcache_read_pc (regcache));
|
|
else
|
|
ret = gdbarch_process_record_signal (gdbarch,
|
|
regcache,
|
|
signal);
|
|
|
|
if (ret > 0)
|
|
error (_("Process record: inferior program stopped."));
|
|
if (ret < 0)
|
|
error (_("Process record: failed to record execution log."));
|
|
|
|
discard_cleanups (old_cleanups);
|
|
|
|
record_full_list->next = record_full_arch_list_head;
|
|
record_full_arch_list_head->prev = record_full_list;
|
|
record_full_list = record_full_arch_list_tail;
|
|
|
|
if (record_full_insn_num == record_full_insn_max_num)
|
|
record_full_list_release_first ();
|
|
else
|
|
record_full_insn_num++;
|
|
}
|
|
|
|
static bool
|
|
record_full_message_wrapper_safe (struct regcache *regcache,
|
|
enum gdb_signal signal)
|
|
{
|
|
TRY
|
|
{
|
|
record_full_message (regcache, signal);
|
|
}
|
|
CATCH (ex, RETURN_MASK_ALL)
|
|
{
|
|
exception_print (gdb_stderr, ex);
|
|
return false;
|
|
}
|
|
END_CATCH
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Set to 1 if record_full_store_registers and record_full_xfer_partial
|
|
doesn't need record. */
|
|
|
|
static int record_full_gdb_operation_disable = 0;
|
|
|
|
scoped_restore_tmpl<int>
|
|
record_full_gdb_operation_disable_set (void)
|
|
{
|
|
return make_scoped_restore (&record_full_gdb_operation_disable, 1);
|
|
}
|
|
|
|
/* Flag set to TRUE for target_stopped_by_watchpoint. */
|
|
static enum target_stop_reason record_full_stop_reason
|
|
= TARGET_STOPPED_BY_NO_REASON;
|
|
|
|
/* Execute one instruction from the record log. Each instruction in
|
|
the log will be represented by an arbitrary sequence of register
|
|
entries and memory entries, followed by an 'end' entry. */
|
|
|
|
static inline void
|
|
record_full_exec_insn (struct regcache *regcache,
|
|
struct gdbarch *gdbarch,
|
|
struct record_full_entry *entry)
|
|
{
|
|
switch (entry->type)
|
|
{
|
|
case record_full_reg: /* reg */
|
|
{
|
|
gdb::byte_vector reg (entry->u.reg.len);
|
|
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_reg %s to "
|
|
"inferior num = %d.\n",
|
|
host_address_to_string (entry),
|
|
entry->u.reg.num);
|
|
|
|
regcache_cooked_read (regcache, entry->u.reg.num, reg.data ());
|
|
regcache_cooked_write (regcache, entry->u.reg.num,
|
|
record_full_get_loc (entry));
|
|
memcpy (record_full_get_loc (entry), reg.data (), entry->u.reg.len);
|
|
}
|
|
break;
|
|
|
|
case record_full_mem: /* mem */
|
|
{
|
|
/* Nothing to do if the entry is flagged not_accessible. */
|
|
if (!entry->u.mem.mem_entry_not_accessible)
|
|
{
|
|
gdb::byte_vector mem (entry->u.mem.len);
|
|
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_mem %s to "
|
|
"inferior addr = %s len = %d.\n",
|
|
host_address_to_string (entry),
|
|
paddress (gdbarch, entry->u.mem.addr),
|
|
entry->u.mem.len);
|
|
|
|
if (record_read_memory (gdbarch,
|
|
entry->u.mem.addr, mem.data (),
|
|
entry->u.mem.len))
|
|
entry->u.mem.mem_entry_not_accessible = 1;
|
|
else
|
|
{
|
|
if (target_write_memory (entry->u.mem.addr,
|
|
record_full_get_loc (entry),
|
|
entry->u.mem.len))
|
|
{
|
|
entry->u.mem.mem_entry_not_accessible = 1;
|
|
if (record_debug)
|
|
warning (_("Process record: error writing memory at "
|
|
"addr = %s len = %d."),
|
|
paddress (gdbarch, entry->u.mem.addr),
|
|
entry->u.mem.len);
|
|
}
|
|
else
|
|
{
|
|
memcpy (record_full_get_loc (entry), mem.data (),
|
|
entry->u.mem.len);
|
|
|
|
/* We've changed memory --- check if a hardware
|
|
watchpoint should trap. Note that this
|
|
presently assumes the target beneath supports
|
|
continuable watchpoints. On non-continuable
|
|
watchpoints target, we'll want to check this
|
|
_before_ actually doing the memory change, and
|
|
not doing the change at all if the watchpoint
|
|
traps. */
|
|
if (hardware_watchpoint_inserted_in_range
|
|
(regcache->aspace (),
|
|
entry->u.mem.addr, entry->u.mem.len))
|
|
record_full_stop_reason = TARGET_STOPPED_BY_WATCHPOINT;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void record_full_restore (void);
|
|
|
|
/* Asynchronous signal handle registered as event loop source for when
|
|
we have pending events ready to be passed to the core. */
|
|
|
|
static struct async_event_handler *record_full_async_inferior_event_token;
|
|
|
|
static void
|
|
record_full_async_inferior_event_handler (gdb_client_data data)
|
|
{
|
|
inferior_event_handler (INF_REG_EVENT, NULL);
|
|
}
|
|
|
|
/* Open the process record target for 'core' files. */
|
|
|
|
static void
|
|
record_full_core_open_1 (const char *name, int from_tty)
|
|
{
|
|
struct regcache *regcache = get_current_regcache ();
|
|
int regnum = gdbarch_num_regs (regcache->arch ());
|
|
int i;
|
|
|
|
/* Get record_full_core_regbuf. */
|
|
target_fetch_registers (regcache, -1);
|
|
record_full_core_regbuf = new detached_regcache (regcache->arch (), false);
|
|
|
|
for (i = 0; i < regnum; i ++)
|
|
record_full_core_regbuf->raw_supply (i, *regcache);
|
|
|
|
/* Get record_full_core_start and record_full_core_end. */
|
|
if (build_section_table (core_bfd, &record_full_core_start,
|
|
&record_full_core_end))
|
|
{
|
|
delete record_full_core_regbuf;
|
|
record_full_core_regbuf = NULL;
|
|
error (_("\"%s\": Can't find sections: %s"),
|
|
bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
|
|
push_target (&record_full_core_ops);
|
|
record_full_restore ();
|
|
}
|
|
|
|
/* Open the process record target for 'live' processes. */
|
|
|
|
static void
|
|
record_full_open_1 (const char *name, int from_tty)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_full_open_1\n");
|
|
|
|
/* check exec */
|
|
if (!target_has_execution)
|
|
error (_("Process record: the program is not being run."));
|
|
if (non_stop)
|
|
error (_("Process record target can't debug inferior in non-stop mode "
|
|
"(non-stop)."));
|
|
|
|
if (!gdbarch_process_record_p (target_gdbarch ()))
|
|
error (_("Process record: the current architecture doesn't support "
|
|
"record function."));
|
|
|
|
push_target (&record_full_ops);
|
|
}
|
|
|
|
static void record_full_init_record_breakpoints (void);
|
|
|
|
/* Open the process record target. */
|
|
|
|
static void
|
|
record_full_open (const char *name, int from_tty)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_full_open\n");
|
|
|
|
record_preopen ();
|
|
|
|
/* Reset */
|
|
record_full_insn_num = 0;
|
|
record_full_insn_count = 0;
|
|
record_full_list = &record_full_first;
|
|
record_full_list->next = NULL;
|
|
|
|
if (core_bfd)
|
|
record_full_core_open_1 (name, from_tty);
|
|
else
|
|
record_full_open_1 (name, from_tty);
|
|
|
|
/* Register extra event sources in the event loop. */
|
|
record_full_async_inferior_event_token
|
|
= create_async_event_handler (record_full_async_inferior_event_handler,
|
|
NULL);
|
|
|
|
record_full_init_record_breakpoints ();
|
|
|
|
gdb::observers::record_changed.notify (current_inferior (), 1, "full", NULL);
|
|
}
|
|
|
|
/* "close" target method. Close the process record target. */
|
|
|
|
void
|
|
record_full_base_target::close ()
|
|
{
|
|
struct record_full_core_buf_entry *entry;
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_full_close\n");
|
|
|
|
record_full_list_release (record_full_list);
|
|
|
|
/* Release record_full_core_regbuf. */
|
|
if (record_full_core_regbuf)
|
|
{
|
|
delete record_full_core_regbuf;
|
|
record_full_core_regbuf = NULL;
|
|
}
|
|
|
|
/* Release record_full_core_buf_list. */
|
|
if (record_full_core_buf_list)
|
|
{
|
|
for (entry = record_full_core_buf_list->prev; entry;
|
|
entry = entry->prev)
|
|
{
|
|
xfree (record_full_core_buf_list);
|
|
record_full_core_buf_list = entry;
|
|
}
|
|
record_full_core_buf_list = NULL;
|
|
}
|
|
|
|
if (record_full_async_inferior_event_token)
|
|
delete_async_event_handler (&record_full_async_inferior_event_token);
|
|
}
|
|
|
|
/* "async" target method. */
|
|
|
|
void
|
|
record_full_base_target::async (int enable)
|
|
{
|
|
if (enable)
|
|
mark_async_event_handler (record_full_async_inferior_event_token);
|
|
else
|
|
clear_async_event_handler (record_full_async_inferior_event_token);
|
|
|
|
beneath->async (enable);
|
|
}
|
|
|
|
static int record_full_resume_step = 0;
|
|
|
|
/* True if we've been resumed, and so each record_full_wait call should
|
|
advance execution. If this is false, record_full_wait will return a
|
|
TARGET_WAITKIND_IGNORE. */
|
|
static int record_full_resumed = 0;
|
|
|
|
/* The execution direction of the last resume we got. This is
|
|
necessary for async mode. Vis (order is not strictly accurate):
|
|
|
|
1. user has the global execution direction set to forward
|
|
2. user does a reverse-step command
|
|
3. record_full_resume is called with global execution direction
|
|
temporarily switched to reverse
|
|
4. GDB's execution direction is reverted back to forward
|
|
5. target record notifies event loop there's an event to handle
|
|
6. infrun asks the target which direction was it going, and switches
|
|
the global execution direction accordingly (to reverse)
|
|
7. infrun polls an event out of the record target, and handles it
|
|
8. GDB goes back to the event loop, and goto #4.
|
|
*/
|
|
static enum exec_direction_kind record_full_execution_dir = EXEC_FORWARD;
|
|
|
|
/* "resume" target method. Resume the process record target. */
|
|
|
|
void
|
|
record_full_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
|
|
{
|
|
record_full_resume_step = step;
|
|
record_full_resumed = 1;
|
|
record_full_execution_dir = ::execution_direction;
|
|
|
|
if (!RECORD_FULL_IS_REPLAY)
|
|
{
|
|
struct gdbarch *gdbarch = target_thread_architecture (ptid);
|
|
|
|
record_full_message (get_current_regcache (), signal);
|
|
|
|
if (!step)
|
|
{
|
|
/* This is not hard single step. */
|
|
if (!gdbarch_software_single_step_p (gdbarch))
|
|
{
|
|
/* This is a normal continue. */
|
|
step = 1;
|
|
}
|
|
else
|
|
{
|
|
/* This arch supports soft single step. */
|
|
if (thread_has_single_step_breakpoints_set (inferior_thread ()))
|
|
{
|
|
/* This is a soft single step. */
|
|
record_full_resume_step = 1;
|
|
}
|
|
else
|
|
step = !insert_single_step_breakpoints (gdbarch);
|
|
}
|
|
}
|
|
|
|
/* Make sure the target beneath reports all signals. */
|
|
target_pass_signals (0, NULL);
|
|
|
|
this->beneath->resume (ptid, step, signal);
|
|
}
|
|
|
|
/* We are about to start executing the inferior (or simulate it),
|
|
let's register it with the event loop. */
|
|
if (target_can_async_p ())
|
|
target_async (1);
|
|
}
|
|
|
|
/* "commit_resume" method for process record target. */
|
|
|
|
void
|
|
record_full_target::commit_resume ()
|
|
{
|
|
if (!RECORD_FULL_IS_REPLAY)
|
|
beneath->commit_resume ();
|
|
}
|
|
|
|
static int record_full_get_sig = 0;
|
|
|
|
/* SIGINT signal handler, registered by "wait" method. */
|
|
|
|
static void
|
|
record_full_sig_handler (int signo)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: get a signal\n");
|
|
|
|
/* It will break the running inferior in replay mode. */
|
|
record_full_resume_step = 1;
|
|
|
|
/* It will let record_full_wait set inferior status to get the signal
|
|
SIGINT. */
|
|
record_full_get_sig = 1;
|
|
}
|
|
|
|
static void
|
|
record_full_wait_cleanups (void *ignore)
|
|
{
|
|
if (execution_direction == EXEC_REVERSE)
|
|
{
|
|
if (record_full_list->next)
|
|
record_full_list = record_full_list->next;
|
|
}
|
|
else
|
|
record_full_list = record_full_list->prev;
|
|
}
|
|
|
|
/* "wait" target method for process record target.
|
|
|
|
In record mode, the target is always run in singlestep mode
|
|
(even when gdb says to continue). The wait method intercepts
|
|
the stop events and determines which ones are to be passed on to
|
|
gdb. Most stop events are just singlestep events that gdb is not
|
|
to know about, so the wait method just records them and keeps
|
|
singlestepping.
|
|
|
|
In replay mode, this function emulates the recorded execution log,
|
|
one instruction at a time (forward or backward), and determines
|
|
where to stop. */
|
|
|
|
static ptid_t
|
|
record_full_wait_1 (struct target_ops *ops,
|
|
ptid_t ptid, struct target_waitstatus *status,
|
|
int options)
|
|
{
|
|
scoped_restore restore_operation_disable
|
|
= record_full_gdb_operation_disable_set ();
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_wait "
|
|
"record_full_resume_step = %d, "
|
|
"record_full_resumed = %d, direction=%s\n",
|
|
record_full_resume_step, record_full_resumed,
|
|
record_full_execution_dir == EXEC_FORWARD
|
|
? "forward" : "reverse");
|
|
|
|
if (!record_full_resumed)
|
|
{
|
|
gdb_assert ((options & TARGET_WNOHANG) != 0);
|
|
|
|
/* No interesting event. */
|
|
status->kind = TARGET_WAITKIND_IGNORE;
|
|
return minus_one_ptid;
|
|
}
|
|
|
|
record_full_get_sig = 0;
|
|
signal (SIGINT, record_full_sig_handler);
|
|
|
|
record_full_stop_reason = TARGET_STOPPED_BY_NO_REASON;
|
|
|
|
if (!RECORD_FULL_IS_REPLAY && ops != &record_full_core_ops)
|
|
{
|
|
if (record_full_resume_step)
|
|
{
|
|
/* This is a single step. */
|
|
return ops->beneath->wait (ptid, status, options);
|
|
}
|
|
else
|
|
{
|
|
/* This is not a single step. */
|
|
ptid_t ret;
|
|
CORE_ADDR tmp_pc;
|
|
struct gdbarch *gdbarch = target_thread_architecture (inferior_ptid);
|
|
|
|
while (1)
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
ret = ops->beneath->wait (ptid, status, options);
|
|
if (status->kind == TARGET_WAITKIND_IGNORE)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_wait "
|
|
"target beneath not done yet\n");
|
|
return ret;
|
|
}
|
|
|
|
ALL_NON_EXITED_THREADS (tp)
|
|
delete_single_step_breakpoints (tp);
|
|
|
|
if (record_full_resume_step)
|
|
return ret;
|
|
|
|
/* Is this a SIGTRAP? */
|
|
if (status->kind == TARGET_WAITKIND_STOPPED
|
|
&& status->value.sig == GDB_SIGNAL_TRAP)
|
|
{
|
|
struct regcache *regcache;
|
|
enum target_stop_reason *stop_reason_p
|
|
= &record_full_stop_reason;
|
|
|
|
/* Yes -- this is likely our single-step finishing,
|
|
but check if there's any reason the core would be
|
|
interested in the event. */
|
|
|
|
registers_changed ();
|
|
regcache = get_current_regcache ();
|
|
tmp_pc = regcache_read_pc (regcache);
|
|
const struct address_space *aspace = regcache->aspace ();
|
|
|
|
if (target_stopped_by_watchpoint ())
|
|
{
|
|
/* Always interested in watchpoints. */
|
|
}
|
|
else if (record_check_stopped_by_breakpoint (aspace, tmp_pc,
|
|
stop_reason_p))
|
|
{
|
|
/* There is a breakpoint here. Let the core
|
|
handle it. */
|
|
}
|
|
else
|
|
{
|
|
/* This is a single-step trap. Record the
|
|
insn and issue another step.
|
|
FIXME: this part can be a random SIGTRAP too.
|
|
But GDB cannot handle it. */
|
|
int step = 1;
|
|
|
|
if (!record_full_message_wrapper_safe (regcache,
|
|
GDB_SIGNAL_0))
|
|
{
|
|
status->kind = TARGET_WAITKIND_STOPPED;
|
|
status->value.sig = GDB_SIGNAL_0;
|
|
break;
|
|
}
|
|
|
|
if (gdbarch_software_single_step_p (gdbarch))
|
|
{
|
|
/* Try to insert the software single step breakpoint.
|
|
If insert success, set step to 0. */
|
|
set_executing (inferior_ptid, 0);
|
|
reinit_frame_cache ();
|
|
|
|
step = !insert_single_step_breakpoints (gdbarch);
|
|
|
|
set_executing (inferior_ptid, 1);
|
|
}
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_wait "
|
|
"issuing one more step in the "
|
|
"target beneath\n");
|
|
ops->beneath->resume (ptid, step, GDB_SIGNAL_0);
|
|
ops->beneath->commit_resume ();
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* The inferior is broken by a breakpoint or a signal. */
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
struct regcache *regcache = get_current_regcache ();
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
const struct address_space *aspace = regcache->aspace ();
|
|
int continue_flag = 1;
|
|
int first_record_full_end = 1;
|
|
struct cleanup *old_cleanups
|
|
= make_cleanup (record_full_wait_cleanups, 0);
|
|
CORE_ADDR tmp_pc;
|
|
|
|
record_full_stop_reason = TARGET_STOPPED_BY_NO_REASON;
|
|
status->kind = TARGET_WAITKIND_STOPPED;
|
|
|
|
/* Check breakpoint when forward execute. */
|
|
if (execution_direction == EXEC_FORWARD)
|
|
{
|
|
tmp_pc = regcache_read_pc (regcache);
|
|
if (record_check_stopped_by_breakpoint (aspace, tmp_pc,
|
|
&record_full_stop_reason))
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: break at %s.\n",
|
|
paddress (gdbarch, tmp_pc));
|
|
goto replay_out;
|
|
}
|
|
}
|
|
|
|
/* If GDB is in terminal_inferior mode, it will not get the signal.
|
|
And in GDB replay mode, GDB doesn't need to be in terminal_inferior
|
|
mode, because inferior will not executed.
|
|
Then set it to terminal_ours to make GDB get the signal. */
|
|
target_terminal::ours ();
|
|
|
|
/* In EXEC_FORWARD mode, record_full_list points to the tail of prev
|
|
instruction. */
|
|
if (execution_direction == EXEC_FORWARD && record_full_list->next)
|
|
record_full_list = record_full_list->next;
|
|
|
|
/* Loop over the record_full_list, looking for the next place to
|
|
stop. */
|
|
do
|
|
{
|
|
/* Check for beginning and end of log. */
|
|
if (execution_direction == EXEC_REVERSE
|
|
&& record_full_list == &record_full_first)
|
|
{
|
|
/* Hit beginning of record log in reverse. */
|
|
status->kind = TARGET_WAITKIND_NO_HISTORY;
|
|
break;
|
|
}
|
|
if (execution_direction != EXEC_REVERSE && !record_full_list->next)
|
|
{
|
|
/* Hit end of record log going forward. */
|
|
status->kind = TARGET_WAITKIND_NO_HISTORY;
|
|
break;
|
|
}
|
|
|
|
record_full_exec_insn (regcache, gdbarch, record_full_list);
|
|
|
|
if (record_full_list->type == record_full_end)
|
|
{
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_full_end %s to "
|
|
"inferior.\n",
|
|
host_address_to_string (record_full_list));
|
|
|
|
if (first_record_full_end && execution_direction == EXEC_REVERSE)
|
|
{
|
|
/* When reverse excute, the first record_full_end is the
|
|
part of current instruction. */
|
|
first_record_full_end = 0;
|
|
}
|
|
else
|
|
{
|
|
/* In EXEC_REVERSE mode, this is the record_full_end of prev
|
|
instruction.
|
|
In EXEC_FORWARD mode, this is the record_full_end of
|
|
current instruction. */
|
|
/* step */
|
|
if (record_full_resume_step)
|
|
{
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: step.\n");
|
|
continue_flag = 0;
|
|
}
|
|
|
|
/* check breakpoint */
|
|
tmp_pc = regcache_read_pc (regcache);
|
|
if (record_check_stopped_by_breakpoint (aspace, tmp_pc,
|
|
&record_full_stop_reason))
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: break "
|
|
"at %s.\n",
|
|
paddress (gdbarch, tmp_pc));
|
|
|
|
continue_flag = 0;
|
|
}
|
|
|
|
if (record_full_stop_reason == TARGET_STOPPED_BY_WATCHPOINT)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: hit hw "
|
|
"watchpoint.\n");
|
|
continue_flag = 0;
|
|
}
|
|
/* Check target signal */
|
|
if (record_full_list->u.end.sigval != GDB_SIGNAL_0)
|
|
/* FIXME: better way to check */
|
|
continue_flag = 0;
|
|
}
|
|
}
|
|
|
|
if (continue_flag)
|
|
{
|
|
if (execution_direction == EXEC_REVERSE)
|
|
{
|
|
if (record_full_list->prev)
|
|
record_full_list = record_full_list->prev;
|
|
}
|
|
else
|
|
{
|
|
if (record_full_list->next)
|
|
record_full_list = record_full_list->next;
|
|
}
|
|
}
|
|
}
|
|
while (continue_flag);
|
|
|
|
replay_out:
|
|
if (record_full_get_sig)
|
|
status->value.sig = GDB_SIGNAL_INT;
|
|
else if (record_full_list->u.end.sigval != GDB_SIGNAL_0)
|
|
/* FIXME: better way to check */
|
|
status->value.sig = record_full_list->u.end.sigval;
|
|
else
|
|
status->value.sig = GDB_SIGNAL_TRAP;
|
|
|
|
discard_cleanups (old_cleanups);
|
|
}
|
|
|
|
signal (SIGINT, handle_sigint);
|
|
|
|
return inferior_ptid;
|
|
}
|
|
|
|
ptid_t
|
|
record_full_base_target::wait (ptid_t ptid, struct target_waitstatus *status,
|
|
int options)
|
|
{
|
|
ptid_t return_ptid;
|
|
|
|
return_ptid = record_full_wait_1 (this, ptid, status, options);
|
|
if (status->kind != TARGET_WAITKIND_IGNORE)
|
|
{
|
|
/* We're reporting a stop. Make sure any spurious
|
|
target_wait(WNOHANG) doesn't advance the target until the
|
|
core wants us resumed again. */
|
|
record_full_resumed = 0;
|
|
}
|
|
return return_ptid;
|
|
}
|
|
|
|
bool
|
|
record_full_base_target::stopped_by_watchpoint ()
|
|
{
|
|
if (RECORD_FULL_IS_REPLAY)
|
|
return record_full_stop_reason == TARGET_STOPPED_BY_WATCHPOINT;
|
|
else
|
|
return beneath->stopped_by_watchpoint ();
|
|
}
|
|
|
|
bool
|
|
record_full_base_target::stopped_data_address (CORE_ADDR *addr_p)
|
|
{
|
|
if (RECORD_FULL_IS_REPLAY)
|
|
return false;
|
|
else
|
|
return this->beneath->stopped_data_address (addr_p);
|
|
}
|
|
|
|
/* The stopped_by_sw_breakpoint method of target record-full. */
|
|
|
|
bool
|
|
record_full_base_target::stopped_by_sw_breakpoint ()
|
|
{
|
|
return record_full_stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT;
|
|
}
|
|
|
|
/* The supports_stopped_by_sw_breakpoint method of target
|
|
record-full. */
|
|
|
|
bool
|
|
record_full_base_target::supports_stopped_by_sw_breakpoint ()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* The stopped_by_hw_breakpoint method of target record-full. */
|
|
|
|
bool
|
|
record_full_base_target::stopped_by_hw_breakpoint ()
|
|
{
|
|
return record_full_stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT;
|
|
}
|
|
|
|
/* The supports_stopped_by_sw_breakpoint method of target
|
|
record-full. */
|
|
|
|
bool
|
|
record_full_base_target::supports_stopped_by_hw_breakpoint ()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* Record registers change (by user or by GDB) to list as an instruction. */
|
|
|
|
static void
|
|
record_full_registers_change (struct regcache *regcache, int regnum)
|
|
{
|
|
/* Check record_full_insn_num. */
|
|
record_full_check_insn_num ();
|
|
|
|
record_full_arch_list_head = NULL;
|
|
record_full_arch_list_tail = NULL;
|
|
|
|
if (regnum < 0)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < gdbarch_num_regs (regcache->arch ()); i++)
|
|
{
|
|
if (record_full_arch_list_add_reg (regcache, i))
|
|
{
|
|
record_full_list_release (record_full_arch_list_tail);
|
|
error (_("Process record: failed to record execution log."));
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (record_full_arch_list_add_reg (regcache, regnum))
|
|
{
|
|
record_full_list_release (record_full_arch_list_tail);
|
|
error (_("Process record: failed to record execution log."));
|
|
}
|
|
}
|
|
if (record_full_arch_list_add_end ())
|
|
{
|
|
record_full_list_release (record_full_arch_list_tail);
|
|
error (_("Process record: failed to record execution log."));
|
|
}
|
|
record_full_list->next = record_full_arch_list_head;
|
|
record_full_arch_list_head->prev = record_full_list;
|
|
record_full_list = record_full_arch_list_tail;
|
|
|
|
if (record_full_insn_num == record_full_insn_max_num)
|
|
record_full_list_release_first ();
|
|
else
|
|
record_full_insn_num++;
|
|
}
|
|
|
|
/* "store_registers" method for process record target. */
|
|
|
|
void
|
|
record_full_target::store_registers (struct regcache *regcache, int regno)
|
|
{
|
|
if (!record_full_gdb_operation_disable)
|
|
{
|
|
if (RECORD_FULL_IS_REPLAY)
|
|
{
|
|
int n;
|
|
|
|
/* Let user choose if he wants to write register or not. */
|
|
if (regno < 0)
|
|
n =
|
|
query (_("Because GDB is in replay mode, changing the "
|
|
"value of a register will make the execution "
|
|
"log unusable from this point onward. "
|
|
"Change all registers?"));
|
|
else
|
|
n =
|
|
query (_("Because GDB is in replay mode, changing the value "
|
|
"of a register will make the execution log unusable "
|
|
"from this point onward. Change register %s?"),
|
|
gdbarch_register_name (regcache->arch (),
|
|
regno));
|
|
|
|
if (!n)
|
|
{
|
|
/* Invalidate the value of regcache that was set in function
|
|
"regcache_raw_write". */
|
|
if (regno < 0)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0;
|
|
i < gdbarch_num_regs (regcache->arch ());
|
|
i++)
|
|
regcache_invalidate (regcache, i);
|
|
}
|
|
else
|
|
regcache_invalidate (regcache, regno);
|
|
|
|
error (_("Process record canceled the operation."));
|
|
}
|
|
|
|
/* Destroy the record from here forward. */
|
|
record_full_list_release_following (record_full_list);
|
|
}
|
|
|
|
record_full_registers_change (regcache, regno);
|
|
}
|
|
this->beneath->store_registers (regcache, regno);
|
|
}
|
|
|
|
/* "xfer_partial" method. Behavior is conditional on
|
|
RECORD_FULL_IS_REPLAY.
|
|
In replay mode, we cannot write memory unles we are willing to
|
|
invalidate the record/replay log from this point forward. */
|
|
|
|
enum target_xfer_status
|
|
record_full_target::xfer_partial (enum target_object object,
|
|
const char *annex, gdb_byte *readbuf,
|
|
const gdb_byte *writebuf, ULONGEST offset,
|
|
ULONGEST len, ULONGEST *xfered_len)
|
|
{
|
|
if (!record_full_gdb_operation_disable
|
|
&& (object == TARGET_OBJECT_MEMORY
|
|
|| object == TARGET_OBJECT_RAW_MEMORY) && writebuf)
|
|
{
|
|
if (RECORD_FULL_IS_REPLAY)
|
|
{
|
|
/* Let user choose if he wants to write memory or not. */
|
|
if (!query (_("Because GDB is in replay mode, writing to memory "
|
|
"will make the execution log unusable from this "
|
|
"point onward. Write memory at address %s?"),
|
|
paddress (target_gdbarch (), offset)))
|
|
error (_("Process record canceled the operation."));
|
|
|
|
/* Destroy the record from here forward. */
|
|
record_full_list_release_following (record_full_list);
|
|
}
|
|
|
|
/* Check record_full_insn_num */
|
|
record_full_check_insn_num ();
|
|
|
|
/* Record registers change to list as an instruction. */
|
|
record_full_arch_list_head = NULL;
|
|
record_full_arch_list_tail = NULL;
|
|
if (record_full_arch_list_add_mem (offset, len))
|
|
{
|
|
record_full_list_release (record_full_arch_list_tail);
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: failed to record "
|
|
"execution log.");
|
|
return TARGET_XFER_E_IO;
|
|
}
|
|
if (record_full_arch_list_add_end ())
|
|
{
|
|
record_full_list_release (record_full_arch_list_tail);
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: failed to record "
|
|
"execution log.");
|
|
return TARGET_XFER_E_IO;
|
|
}
|
|
record_full_list->next = record_full_arch_list_head;
|
|
record_full_arch_list_head->prev = record_full_list;
|
|
record_full_list = record_full_arch_list_tail;
|
|
|
|
if (record_full_insn_num == record_full_insn_max_num)
|
|
record_full_list_release_first ();
|
|
else
|
|
record_full_insn_num++;
|
|
}
|
|
|
|
return this->beneath->xfer_partial (object, annex, readbuf, writebuf, offset,
|
|
len, xfered_len);
|
|
}
|
|
|
|
/* This structure represents a breakpoint inserted while the record
|
|
target is active. We use this to know when to install/remove
|
|
breakpoints in/from the target beneath. For example, a breakpoint
|
|
may be inserted while recording, but removed when not replaying nor
|
|
recording. In that case, the breakpoint had not been inserted on
|
|
the target beneath, so we should not try to remove it there. */
|
|
|
|
struct record_full_breakpoint
|
|
{
|
|
/* The address and address space the breakpoint was set at. */
|
|
struct address_space *address_space;
|
|
CORE_ADDR addr;
|
|
|
|
/* True when the breakpoint has been also installed in the target
|
|
beneath. This will be false for breakpoints set during replay or
|
|
when recording. */
|
|
int in_target_beneath;
|
|
};
|
|
|
|
typedef struct record_full_breakpoint *record_full_breakpoint_p;
|
|
DEF_VEC_P(record_full_breakpoint_p);
|
|
|
|
/* The list of breakpoints inserted while the record target is
|
|
active. */
|
|
VEC(record_full_breakpoint_p) *record_full_breakpoints = NULL;
|
|
|
|
static void
|
|
record_full_sync_record_breakpoints (struct bp_location *loc, void *data)
|
|
{
|
|
if (loc->loc_type != bp_loc_software_breakpoint)
|
|
return;
|
|
|
|
if (loc->inserted)
|
|
{
|
|
struct record_full_breakpoint *bp = XNEW (struct record_full_breakpoint);
|
|
|
|
bp->addr = loc->target_info.placed_address;
|
|
bp->address_space = loc->target_info.placed_address_space;
|
|
|
|
bp->in_target_beneath = 1;
|
|
|
|
VEC_safe_push (record_full_breakpoint_p, record_full_breakpoints, bp);
|
|
}
|
|
}
|
|
|
|
/* Sync existing breakpoints to record_full_breakpoints. */
|
|
|
|
static void
|
|
record_full_init_record_breakpoints (void)
|
|
{
|
|
VEC_free (record_full_breakpoint_p, record_full_breakpoints);
|
|
|
|
iterate_over_bp_locations (record_full_sync_record_breakpoints);
|
|
}
|
|
|
|
/* Behavior is conditional on RECORD_FULL_IS_REPLAY. We will not actually
|
|
insert or remove breakpoints in the real target when replaying, nor
|
|
when recording. */
|
|
|
|
int
|
|
record_full_target::insert_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
struct record_full_breakpoint *bp;
|
|
int in_target_beneath = 0;
|
|
int ix;
|
|
|
|
if (!RECORD_FULL_IS_REPLAY)
|
|
{
|
|
/* When recording, we currently always single-step, so we don't
|
|
really need to install regular breakpoints in the inferior.
|
|
However, we do have to insert software single-step
|
|
breakpoints, in case the target can't hardware step. To keep
|
|
things simple, we always insert. */
|
|
|
|
scoped_restore restore_operation_disable
|
|
= record_full_gdb_operation_disable_set ();
|
|
|
|
int ret = this->beneath->insert_breakpoint (gdbarch, bp_tgt);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
in_target_beneath = 1;
|
|
}
|
|
|
|
/* Use the existing entries if found in order to avoid duplication
|
|
in record_full_breakpoints. */
|
|
|
|
for (ix = 0;
|
|
VEC_iterate (record_full_breakpoint_p,
|
|
record_full_breakpoints, ix, bp);
|
|
++ix)
|
|
{
|
|
if (bp->addr == bp_tgt->placed_address
|
|
&& bp->address_space == bp_tgt->placed_address_space)
|
|
{
|
|
gdb_assert (bp->in_target_beneath == in_target_beneath);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
bp = XNEW (struct record_full_breakpoint);
|
|
bp->addr = bp_tgt->placed_address;
|
|
bp->address_space = bp_tgt->placed_address_space;
|
|
bp->in_target_beneath = in_target_beneath;
|
|
VEC_safe_push (record_full_breakpoint_p, record_full_breakpoints, bp);
|
|
return 0;
|
|
}
|
|
|
|
/* "remove_breakpoint" method for process record target. */
|
|
|
|
int
|
|
record_full_target::remove_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt,
|
|
enum remove_bp_reason reason)
|
|
{
|
|
struct record_full_breakpoint *bp;
|
|
int ix;
|
|
|
|
for (ix = 0;
|
|
VEC_iterate (record_full_breakpoint_p,
|
|
record_full_breakpoints, ix, bp);
|
|
++ix)
|
|
{
|
|
if (bp->addr == bp_tgt->placed_address
|
|
&& bp->address_space == bp_tgt->placed_address_space)
|
|
{
|
|
if (bp->in_target_beneath)
|
|
{
|
|
scoped_restore restore_operation_disable
|
|
= record_full_gdb_operation_disable_set ();
|
|
|
|
int ret = this->beneath->remove_breakpoint (gdbarch, bp_tgt,
|
|
reason);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
|
|
if (reason == REMOVE_BREAKPOINT)
|
|
{
|
|
VEC_unordered_remove (record_full_breakpoint_p,
|
|
record_full_breakpoints, ix);
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
gdb_assert_not_reached ("removing unknown breakpoint");
|
|
}
|
|
|
|
/* "can_execute_reverse" method for process record target. */
|
|
|
|
bool
|
|
record_full_base_target::can_execute_reverse ()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* "get_bookmark" method for process record and prec over core. */
|
|
|
|
gdb_byte *
|
|
record_full_base_target::get_bookmark (const char *args, int from_tty)
|
|
{
|
|
char *ret = NULL;
|
|
|
|
/* Return stringified form of instruction count. */
|
|
if (record_full_list && record_full_list->type == record_full_end)
|
|
ret = xstrdup (pulongest (record_full_list->u.end.insn_num));
|
|
|
|
if (record_debug)
|
|
{
|
|
if (ret)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"record_full_get_bookmark returns %s\n", ret);
|
|
else
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"record_full_get_bookmark returns NULL\n");
|
|
}
|
|
return (gdb_byte *) ret;
|
|
}
|
|
|
|
/* "goto_bookmark" method for process record and prec over core. */
|
|
|
|
void
|
|
record_full_base_target::goto_bookmark (const gdb_byte *raw_bookmark,
|
|
int from_tty)
|
|
{
|
|
const char *bookmark = (const char *) raw_bookmark;
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"record_full_goto_bookmark receives %s\n", bookmark);
|
|
|
|
std::string name_holder;
|
|
if (bookmark[0] == '\'' || bookmark[0] == '\"')
|
|
{
|
|
if (bookmark[strlen (bookmark) - 1] != bookmark[0])
|
|
error (_("Unbalanced quotes: %s"), bookmark);
|
|
|
|
name_holder = std::string (bookmark + 1, strlen (bookmark) - 2);
|
|
bookmark = name_holder.c_str ();
|
|
}
|
|
|
|
record_goto (bookmark);
|
|
}
|
|
|
|
enum exec_direction_kind
|
|
record_full_base_target::execution_direction ()
|
|
{
|
|
return record_full_execution_dir;
|
|
}
|
|
|
|
/* The record_method method of target record-full. */
|
|
|
|
enum record_method
|
|
record_full_base_target::record_method (ptid_t ptid)
|
|
{
|
|
return RECORD_METHOD_FULL;
|
|
}
|
|
|
|
void
|
|
record_full_base_target::info_record ()
|
|
{
|
|
struct record_full_entry *p;
|
|
|
|
if (RECORD_FULL_IS_REPLAY)
|
|
printf_filtered (_("Replay mode:\n"));
|
|
else
|
|
printf_filtered (_("Record mode:\n"));
|
|
|
|
/* Find entry for first actual instruction in the log. */
|
|
for (p = record_full_first.next;
|
|
p != NULL && p->type != record_full_end;
|
|
p = p->next)
|
|
;
|
|
|
|
/* Do we have a log at all? */
|
|
if (p != NULL && p->type == record_full_end)
|
|
{
|
|
/* Display instruction number for first instruction in the log. */
|
|
printf_filtered (_("Lowest recorded instruction number is %s.\n"),
|
|
pulongest (p->u.end.insn_num));
|
|
|
|
/* If in replay mode, display where we are in the log. */
|
|
if (RECORD_FULL_IS_REPLAY)
|
|
printf_filtered (_("Current instruction number is %s.\n"),
|
|
pulongest (record_full_list->u.end.insn_num));
|
|
|
|
/* Display instruction number for last instruction in the log. */
|
|
printf_filtered (_("Highest recorded instruction number is %s.\n"),
|
|
pulongest (record_full_insn_count));
|
|
|
|
/* Display log count. */
|
|
printf_filtered (_("Log contains %u instructions.\n"),
|
|
record_full_insn_num);
|
|
}
|
|
else
|
|
printf_filtered (_("No instructions have been logged.\n"));
|
|
|
|
/* Display max log size. */
|
|
printf_filtered (_("Max logged instructions is %u.\n"),
|
|
record_full_insn_max_num);
|
|
}
|
|
|
|
bool
|
|
record_full_base_target::supports_delete_record ()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* The "delete_record" target method. */
|
|
|
|
void
|
|
record_full_base_target::delete_record ()
|
|
{
|
|
record_full_list_release_following (record_full_list);
|
|
}
|
|
|
|
/* The "record_is_replaying" target method. */
|
|
|
|
bool
|
|
record_full_base_target::record_is_replaying (ptid_t ptid)
|
|
{
|
|
return RECORD_FULL_IS_REPLAY;
|
|
}
|
|
|
|
/* The "record_will_replay" target method. */
|
|
|
|
bool
|
|
record_full_base_target::record_will_replay (ptid_t ptid, int dir)
|
|
{
|
|
/* We can currently only record when executing forwards. Should we be able
|
|
to record when executing backwards on targets that support reverse
|
|
execution, this needs to be changed. */
|
|
|
|
return RECORD_FULL_IS_REPLAY || dir == EXEC_REVERSE;
|
|
}
|
|
|
|
/* Go to a specific entry. */
|
|
|
|
static void
|
|
record_full_goto_entry (struct record_full_entry *p)
|
|
{
|
|
if (p == NULL)
|
|
error (_("Target insn not found."));
|
|
else if (p == record_full_list)
|
|
error (_("Already at target insn."));
|
|
else if (p->u.end.insn_num > record_full_list->u.end.insn_num)
|
|
{
|
|
printf_filtered (_("Go forward to insn number %s\n"),
|
|
pulongest (p->u.end.insn_num));
|
|
record_full_goto_insn (p, EXEC_FORWARD);
|
|
}
|
|
else
|
|
{
|
|
printf_filtered (_("Go backward to insn number %s\n"),
|
|
pulongest (p->u.end.insn_num));
|
|
record_full_goto_insn (p, EXEC_REVERSE);
|
|
}
|
|
|
|
registers_changed ();
|
|
reinit_frame_cache ();
|
|
stop_pc = regcache_read_pc (get_current_regcache ());
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
|
|
}
|
|
|
|
/* The "goto_record_begin" target method. */
|
|
|
|
void
|
|
record_full_base_target::goto_record_begin ()
|
|
{
|
|
struct record_full_entry *p = NULL;
|
|
|
|
for (p = &record_full_first; p != NULL; p = p->next)
|
|
if (p->type == record_full_end)
|
|
break;
|
|
|
|
record_full_goto_entry (p);
|
|
}
|
|
|
|
/* The "goto_record_end" target method. */
|
|
|
|
void
|
|
record_full_base_target::goto_record_end ()
|
|
{
|
|
struct record_full_entry *p = NULL;
|
|
|
|
for (p = record_full_list; p->next != NULL; p = p->next)
|
|
;
|
|
for (; p!= NULL; p = p->prev)
|
|
if (p->type == record_full_end)
|
|
break;
|
|
|
|
record_full_goto_entry (p);
|
|
}
|
|
|
|
/* The "goto_record" target method. */
|
|
|
|
void
|
|
record_full_base_target::goto_record (ULONGEST target_insn)
|
|
{
|
|
struct record_full_entry *p = NULL;
|
|
|
|
for (p = &record_full_first; p != NULL; p = p->next)
|
|
if (p->type == record_full_end && p->u.end.insn_num == target_insn)
|
|
break;
|
|
|
|
record_full_goto_entry (p);
|
|
}
|
|
|
|
/* The "record_stop_replaying" target method. */
|
|
|
|
void
|
|
record_full_base_target::record_stop_replaying ()
|
|
{
|
|
goto_record_end ();
|
|
}
|
|
|
|
/* "resume" method for prec over corefile. */
|
|
|
|
void
|
|
record_full_core_target::resume (ptid_t ptid, int step,
|
|
enum gdb_signal signal)
|
|
{
|
|
record_full_resume_step = step;
|
|
record_full_resumed = 1;
|
|
record_full_execution_dir = ::execution_direction;
|
|
|
|
/* We are about to start executing the inferior (or simulate it),
|
|
let's register it with the event loop. */
|
|
if (target_can_async_p ())
|
|
target_async (1);
|
|
}
|
|
|
|
/* "kill" method for prec over corefile. */
|
|
|
|
void
|
|
record_full_core_target::kill ()
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_full_core_kill\n");
|
|
|
|
unpush_target (this);
|
|
}
|
|
|
|
/* "fetch_registers" method for prec over corefile. */
|
|
|
|
void
|
|
record_full_core_target::fetch_registers (struct regcache *regcache,
|
|
int regno)
|
|
{
|
|
if (regno < 0)
|
|
{
|
|
int num = gdbarch_num_regs (regcache->arch ());
|
|
int i;
|
|
|
|
for (i = 0; i < num; i ++)
|
|
regcache->raw_supply (i, *record_full_core_regbuf);
|
|
}
|
|
else
|
|
regcache->raw_supply (regno, *record_full_core_regbuf);
|
|
}
|
|
|
|
/* "prepare_to_store" method for prec over corefile. */
|
|
|
|
void
|
|
record_full_core_target::prepare_to_store (struct regcache *regcache)
|
|
{
|
|
}
|
|
|
|
/* "store_registers" method for prec over corefile. */
|
|
|
|
void
|
|
record_full_core_target::store_registers (struct regcache *regcache,
|
|
int regno)
|
|
{
|
|
if (record_full_gdb_operation_disable)
|
|
record_full_core_regbuf->raw_supply (regno, *regcache);
|
|
else
|
|
error (_("You can't do that without a process to debug."));
|
|
}
|
|
|
|
/* "xfer_partial" method for prec over corefile. */
|
|
|
|
enum target_xfer_status
|
|
record_full_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)
|
|
{
|
|
if (object == TARGET_OBJECT_MEMORY)
|
|
{
|
|
if (record_full_gdb_operation_disable || !writebuf)
|
|
{
|
|
struct target_section *p;
|
|
|
|
for (p = record_full_core_start; p < record_full_core_end; p++)
|
|
{
|
|
if (offset >= p->addr)
|
|
{
|
|
struct record_full_core_buf_entry *entry;
|
|
ULONGEST sec_offset;
|
|
|
|
if (offset >= p->endaddr)
|
|
continue;
|
|
|
|
if (offset + len > p->endaddr)
|
|
len = p->endaddr - offset;
|
|
|
|
sec_offset = offset - p->addr;
|
|
|
|
/* Read readbuf or write writebuf p, offset, len. */
|
|
/* Check flags. */
|
|
if (p->the_bfd_section->flags & SEC_CONSTRUCTOR
|
|
|| (p->the_bfd_section->flags & SEC_HAS_CONTENTS) == 0)
|
|
{
|
|
if (readbuf)
|
|
memset (readbuf, 0, len);
|
|
|
|
*xfered_len = len;
|
|
return TARGET_XFER_OK;
|
|
}
|
|
/* Get record_full_core_buf_entry. */
|
|
for (entry = record_full_core_buf_list; entry;
|
|
entry = entry->prev)
|
|
if (entry->p == p)
|
|
break;
|
|
if (writebuf)
|
|
{
|
|
if (!entry)
|
|
{
|
|
/* Add a new entry. */
|
|
entry = XNEW (struct record_full_core_buf_entry);
|
|
entry->p = p;
|
|
if (!bfd_malloc_and_get_section
|
|
(p->the_bfd_section->owner,
|
|
p->the_bfd_section,
|
|
&entry->buf))
|
|
{
|
|
xfree (entry);
|
|
return TARGET_XFER_EOF;
|
|
}
|
|
entry->prev = record_full_core_buf_list;
|
|
record_full_core_buf_list = entry;
|
|
}
|
|
|
|
memcpy (entry->buf + sec_offset, writebuf,
|
|
(size_t) len);
|
|
}
|
|
else
|
|
{
|
|
if (!entry)
|
|
return this->beneath->xfer_partial (object, annex,
|
|
readbuf, writebuf,
|
|
offset, len,
|
|
xfered_len);
|
|
|
|
memcpy (readbuf, entry->buf + sec_offset,
|
|
(size_t) len);
|
|
}
|
|
|
|
*xfered_len = len;
|
|
return TARGET_XFER_OK;
|
|
}
|
|
}
|
|
|
|
return TARGET_XFER_E_IO;
|
|
}
|
|
else
|
|
error (_("You can't do that without a process to debug."));
|
|
}
|
|
|
|
return this->beneath->xfer_partial (object, annex,
|
|
readbuf, writebuf, offset, len,
|
|
xfered_len);
|
|
}
|
|
|
|
/* "insert_breakpoint" method for prec over corefile. */
|
|
|
|
int
|
|
record_full_core_target::insert_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* "remove_breakpoint" method for prec over corefile. */
|
|
|
|
int
|
|
record_full_core_target::remove_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt,
|
|
enum remove_bp_reason reason)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* "has_execution" method for prec over corefile. */
|
|
|
|
bool
|
|
record_full_core_target::has_execution (ptid_t the_ptid)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* Record log save-file format
|
|
Version 1 (never released)
|
|
|
|
Header:
|
|
4 bytes: magic number htonl(0x20090829).
|
|
NOTE: be sure to change whenever this file format changes!
|
|
|
|
Records:
|
|
record_full_end:
|
|
1 byte: record type (record_full_end, see enum record_full_type).
|
|
record_full_reg:
|
|
1 byte: record type (record_full_reg, see enum record_full_type).
|
|
8 bytes: register id (network byte order).
|
|
MAX_REGISTER_SIZE bytes: register value.
|
|
record_full_mem:
|
|
1 byte: record type (record_full_mem, see enum record_full_type).
|
|
8 bytes: memory length (network byte order).
|
|
8 bytes: memory address (network byte order).
|
|
n bytes: memory value (n == memory length).
|
|
|
|
Version 2
|
|
4 bytes: magic number netorder32(0x20091016).
|
|
NOTE: be sure to change whenever this file format changes!
|
|
|
|
Records:
|
|
record_full_end:
|
|
1 byte: record type (record_full_end, see enum record_full_type).
|
|
4 bytes: signal
|
|
4 bytes: instruction count
|
|
record_full_reg:
|
|
1 byte: record type (record_full_reg, see enum record_full_type).
|
|
4 bytes: register id (network byte order).
|
|
n bytes: register value (n == actual register size).
|
|
(eg. 4 bytes for x86 general registers).
|
|
record_full_mem:
|
|
1 byte: record type (record_full_mem, see enum record_full_type).
|
|
4 bytes: memory length (network byte order).
|
|
8 bytes: memory address (network byte order).
|
|
n bytes: memory value (n == memory length).
|
|
|
|
*/
|
|
|
|
/* bfdcore_read -- read bytes from a core file section. */
|
|
|
|
static inline void
|
|
bfdcore_read (bfd *obfd, asection *osec, void *buf, int len, int *offset)
|
|
{
|
|
int ret = bfd_get_section_contents (obfd, osec, buf, *offset, len);
|
|
|
|
if (ret)
|
|
*offset += len;
|
|
else
|
|
error (_("Failed to read %d bytes from core file %s ('%s')."),
|
|
len, bfd_get_filename (obfd),
|
|
bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
|
|
static inline uint64_t
|
|
netorder64 (uint64_t input)
|
|
{
|
|
uint64_t ret;
|
|
|
|
store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret),
|
|
BFD_ENDIAN_BIG, input);
|
|
return ret;
|
|
}
|
|
|
|
static inline uint32_t
|
|
netorder32 (uint32_t input)
|
|
{
|
|
uint32_t ret;
|
|
|
|
store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret),
|
|
BFD_ENDIAN_BIG, input);
|
|
return ret;
|
|
}
|
|
|
|
/* Restore the execution log from a core_bfd file. */
|
|
static void
|
|
record_full_restore (void)
|
|
{
|
|
uint32_t magic;
|
|
struct cleanup *old_cleanups;
|
|
struct record_full_entry *rec;
|
|
asection *osec;
|
|
uint32_t osec_size;
|
|
int bfd_offset = 0;
|
|
struct regcache *regcache;
|
|
|
|
/* We restore the execution log from the open core bfd,
|
|
if there is one. */
|
|
if (core_bfd == NULL)
|
|
return;
|
|
|
|
/* "record_full_restore" can only be called when record list is empty. */
|
|
gdb_assert (record_full_first.next == NULL);
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Restoring recording from core file.\n");
|
|
|
|
/* Now need to find our special note section. */
|
|
osec = bfd_get_section_by_name (core_bfd, "null0");
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Find precord section %s.\n",
|
|
osec ? "succeeded" : "failed");
|
|
if (osec == NULL)
|
|
return;
|
|
osec_size = bfd_section_size (core_bfd, osec);
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "%s", bfd_section_name (core_bfd, osec));
|
|
|
|
/* Check the magic code. */
|
|
bfdcore_read (core_bfd, osec, &magic, sizeof (magic), &bfd_offset);
|
|
if (magic != RECORD_FULL_FILE_MAGIC)
|
|
error (_("Version mis-match or file format error in core file %s."),
|
|
bfd_get_filename (core_bfd));
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Reading 4-byte magic cookie "
|
|
"RECORD_FULL_FILE_MAGIC (0x%s)\n",
|
|
phex_nz (netorder32 (magic), 4));
|
|
|
|
/* Restore the entries in recfd into record_full_arch_list_head and
|
|
record_full_arch_list_tail. */
|
|
record_full_arch_list_head = NULL;
|
|
record_full_arch_list_tail = NULL;
|
|
record_full_insn_num = 0;
|
|
old_cleanups = make_cleanup (record_full_arch_list_cleanups, 0);
|
|
regcache = get_current_regcache ();
|
|
|
|
while (1)
|
|
{
|
|
uint8_t rectype;
|
|
uint32_t regnum, len, signal, count;
|
|
uint64_t addr;
|
|
|
|
/* We are finished when offset reaches osec_size. */
|
|
if (bfd_offset >= osec_size)
|
|
break;
|
|
bfdcore_read (core_bfd, osec, &rectype, sizeof (rectype), &bfd_offset);
|
|
|
|
switch (rectype)
|
|
{
|
|
case record_full_reg: /* reg */
|
|
/* Get register number to regnum. */
|
|
bfdcore_read (core_bfd, osec, ®num,
|
|
sizeof (regnum), &bfd_offset);
|
|
regnum = netorder32 (regnum);
|
|
|
|
rec = record_full_reg_alloc (regcache, regnum);
|
|
|
|
/* Get val. */
|
|
bfdcore_read (core_bfd, osec, record_full_get_loc (rec),
|
|
rec->u.reg.len, &bfd_offset);
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Reading register %d (1 "
|
|
"plus %lu plus %d bytes)\n",
|
|
rec->u.reg.num,
|
|
(unsigned long) sizeof (regnum),
|
|
rec->u.reg.len);
|
|
break;
|
|
|
|
case record_full_mem: /* mem */
|
|
/* Get len. */
|
|
bfdcore_read (core_bfd, osec, &len,
|
|
sizeof (len), &bfd_offset);
|
|
len = netorder32 (len);
|
|
|
|
/* Get addr. */
|
|
bfdcore_read (core_bfd, osec, &addr,
|
|
sizeof (addr), &bfd_offset);
|
|
addr = netorder64 (addr);
|
|
|
|
rec = record_full_mem_alloc (addr, len);
|
|
|
|
/* Get val. */
|
|
bfdcore_read (core_bfd, osec, record_full_get_loc (rec),
|
|
rec->u.mem.len, &bfd_offset);
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Reading memory %s (1 plus "
|
|
"%lu plus %lu plus %d bytes)\n",
|
|
paddress (get_current_arch (),
|
|
rec->u.mem.addr),
|
|
(unsigned long) sizeof (addr),
|
|
(unsigned long) sizeof (len),
|
|
rec->u.mem.len);
|
|
break;
|
|
|
|
case record_full_end: /* end */
|
|
rec = record_full_end_alloc ();
|
|
record_full_insn_num ++;
|
|
|
|
/* Get signal value. */
|
|
bfdcore_read (core_bfd, osec, &signal,
|
|
sizeof (signal), &bfd_offset);
|
|
signal = netorder32 (signal);
|
|
rec->u.end.sigval = (enum gdb_signal) signal;
|
|
|
|
/* Get insn count. */
|
|
bfdcore_read (core_bfd, osec, &count,
|
|
sizeof (count), &bfd_offset);
|
|
count = netorder32 (count);
|
|
rec->u.end.insn_num = count;
|
|
record_full_insn_count = count + 1;
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Reading record_full_end (1 + "
|
|
"%lu + %lu bytes), offset == %s\n",
|
|
(unsigned long) sizeof (signal),
|
|
(unsigned long) sizeof (count),
|
|
paddress (get_current_arch (),
|
|
bfd_offset));
|
|
break;
|
|
|
|
default:
|
|
error (_("Bad entry type in core file %s."),
|
|
bfd_get_filename (core_bfd));
|
|
break;
|
|
}
|
|
|
|
/* Add rec to record arch list. */
|
|
record_full_arch_list_add (rec);
|
|
}
|
|
|
|
discard_cleanups (old_cleanups);
|
|
|
|
/* Add record_full_arch_list_head to the end of record list. */
|
|
record_full_first.next = record_full_arch_list_head;
|
|
record_full_arch_list_head->prev = &record_full_first;
|
|
record_full_arch_list_tail->next = NULL;
|
|
record_full_list = &record_full_first;
|
|
|
|
/* Update record_full_insn_max_num. */
|
|
if (record_full_insn_num > record_full_insn_max_num)
|
|
{
|
|
record_full_insn_max_num = record_full_insn_num;
|
|
warning (_("Auto increase record/replay buffer limit to %u."),
|
|
record_full_insn_max_num);
|
|
}
|
|
|
|
/* Succeeded. */
|
|
printf_filtered (_("Restored records from core file %s.\n"),
|
|
bfd_get_filename (core_bfd));
|
|
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
|
|
}
|
|
|
|
/* bfdcore_write -- write bytes into a core file section. */
|
|
|
|
static inline void
|
|
bfdcore_write (bfd *obfd, asection *osec, void *buf, int len, int *offset)
|
|
{
|
|
int ret = bfd_set_section_contents (obfd, osec, buf, *offset, len);
|
|
|
|
if (ret)
|
|
*offset += len;
|
|
else
|
|
error (_("Failed to write %d bytes to core file %s ('%s')."),
|
|
len, bfd_get_filename (obfd),
|
|
bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
|
|
/* Restore the execution log from a file. We use a modified elf
|
|
corefile format, with an extra section for our data. */
|
|
|
|
static void
|
|
cmd_record_full_restore (const char *args, int from_tty)
|
|
{
|
|
core_file_command (args, from_tty);
|
|
record_full_open (args, from_tty);
|
|
}
|
|
|
|
/* Save the execution log to a file. We use a modified elf corefile
|
|
format, with an extra section for our data. */
|
|
|
|
void
|
|
record_full_base_target::save_record (const char *recfilename)
|
|
{
|
|
struct record_full_entry *cur_record_full_list;
|
|
uint32_t magic;
|
|
struct regcache *regcache;
|
|
struct gdbarch *gdbarch;
|
|
int save_size = 0;
|
|
asection *osec = NULL;
|
|
int bfd_offset = 0;
|
|
|
|
/* Open the save file. */
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Saving execution log to core file '%s'\n",
|
|
recfilename);
|
|
|
|
/* Open the output file. */
|
|
gdb_bfd_ref_ptr obfd (create_gcore_bfd (recfilename));
|
|
|
|
/* Arrange to remove the output file on failure. */
|
|
gdb::unlinker unlink_file (recfilename);
|
|
|
|
/* Save the current record entry to "cur_record_full_list". */
|
|
cur_record_full_list = record_full_list;
|
|
|
|
/* Get the values of regcache and gdbarch. */
|
|
regcache = get_current_regcache ();
|
|
gdbarch = regcache->arch ();
|
|
|
|
/* Disable the GDB operation record. */
|
|
scoped_restore restore_operation_disable
|
|
= record_full_gdb_operation_disable_set ();
|
|
|
|
/* Reverse execute to the begin of record list. */
|
|
while (1)
|
|
{
|
|
/* Check for beginning and end of log. */
|
|
if (record_full_list == &record_full_first)
|
|
break;
|
|
|
|
record_full_exec_insn (regcache, gdbarch, record_full_list);
|
|
|
|
if (record_full_list->prev)
|
|
record_full_list = record_full_list->prev;
|
|
}
|
|
|
|
/* Compute the size needed for the extra bfd section. */
|
|
save_size = 4; /* magic cookie */
|
|
for (record_full_list = record_full_first.next; record_full_list;
|
|
record_full_list = record_full_list->next)
|
|
switch (record_full_list->type)
|
|
{
|
|
case record_full_end:
|
|
save_size += 1 + 4 + 4;
|
|
break;
|
|
case record_full_reg:
|
|
save_size += 1 + 4 + record_full_list->u.reg.len;
|
|
break;
|
|
case record_full_mem:
|
|
save_size += 1 + 4 + 8 + record_full_list->u.mem.len;
|
|
break;
|
|
}
|
|
|
|
/* Make the new bfd section. */
|
|
osec = bfd_make_section_anyway_with_flags (obfd.get (), "precord",
|
|
SEC_HAS_CONTENTS
|
|
| SEC_READONLY);
|
|
if (osec == NULL)
|
|
error (_("Failed to create 'precord' section for corefile %s: %s"),
|
|
recfilename,
|
|
bfd_errmsg (bfd_get_error ()));
|
|
bfd_set_section_size (obfd.get (), osec, save_size);
|
|
bfd_set_section_vma (obfd.get (), osec, 0);
|
|
bfd_set_section_alignment (obfd.get (), osec, 0);
|
|
bfd_section_lma (obfd.get (), osec) = 0;
|
|
|
|
/* Save corefile state. */
|
|
write_gcore_file (obfd.get ());
|
|
|
|
/* Write out the record log. */
|
|
/* Write the magic code. */
|
|
magic = RECORD_FULL_FILE_MAGIC;
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Writing 4-byte magic cookie "
|
|
"RECORD_FULL_FILE_MAGIC (0x%s)\n",
|
|
phex_nz (magic, 4));
|
|
bfdcore_write (obfd.get (), osec, &magic, sizeof (magic), &bfd_offset);
|
|
|
|
/* Save the entries to recfd and forward execute to the end of
|
|
record list. */
|
|
record_full_list = &record_full_first;
|
|
while (1)
|
|
{
|
|
/* Save entry. */
|
|
if (record_full_list != &record_full_first)
|
|
{
|
|
uint8_t type;
|
|
uint32_t regnum, len, signal, count;
|
|
uint64_t addr;
|
|
|
|
type = record_full_list->type;
|
|
bfdcore_write (obfd.get (), osec, &type, sizeof (type), &bfd_offset);
|
|
|
|
switch (record_full_list->type)
|
|
{
|
|
case record_full_reg: /* reg */
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Writing register %d (1 "
|
|
"plus %lu plus %d bytes)\n",
|
|
record_full_list->u.reg.num,
|
|
(unsigned long) sizeof (regnum),
|
|
record_full_list->u.reg.len);
|
|
|
|
/* Write regnum. */
|
|
regnum = netorder32 (record_full_list->u.reg.num);
|
|
bfdcore_write (obfd.get (), osec, ®num,
|
|
sizeof (regnum), &bfd_offset);
|
|
|
|
/* Write regval. */
|
|
bfdcore_write (obfd.get (), osec,
|
|
record_full_get_loc (record_full_list),
|
|
record_full_list->u.reg.len, &bfd_offset);
|
|
break;
|
|
|
|
case record_full_mem: /* mem */
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Writing memory %s (1 plus "
|
|
"%lu plus %lu plus %d bytes)\n",
|
|
paddress (gdbarch,
|
|
record_full_list->u.mem.addr),
|
|
(unsigned long) sizeof (addr),
|
|
(unsigned long) sizeof (len),
|
|
record_full_list->u.mem.len);
|
|
|
|
/* Write memlen. */
|
|
len = netorder32 (record_full_list->u.mem.len);
|
|
bfdcore_write (obfd.get (), osec, &len, sizeof (len),
|
|
&bfd_offset);
|
|
|
|
/* Write memaddr. */
|
|
addr = netorder64 (record_full_list->u.mem.addr);
|
|
bfdcore_write (obfd.get (), osec, &addr,
|
|
sizeof (addr), &bfd_offset);
|
|
|
|
/* Write memval. */
|
|
bfdcore_write (obfd.get (), osec,
|
|
record_full_get_loc (record_full_list),
|
|
record_full_list->u.mem.len, &bfd_offset);
|
|
break;
|
|
|
|
case record_full_end:
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
" Writing record_full_end (1 + "
|
|
"%lu + %lu bytes)\n",
|
|
(unsigned long) sizeof (signal),
|
|
(unsigned long) sizeof (count));
|
|
/* Write signal value. */
|
|
signal = netorder32 (record_full_list->u.end.sigval);
|
|
bfdcore_write (obfd.get (), osec, &signal,
|
|
sizeof (signal), &bfd_offset);
|
|
|
|
/* Write insn count. */
|
|
count = netorder32 (record_full_list->u.end.insn_num);
|
|
bfdcore_write (obfd.get (), osec, &count,
|
|
sizeof (count), &bfd_offset);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Execute entry. */
|
|
record_full_exec_insn (regcache, gdbarch, record_full_list);
|
|
|
|
if (record_full_list->next)
|
|
record_full_list = record_full_list->next;
|
|
else
|
|
break;
|
|
}
|
|
|
|
/* Reverse execute to cur_record_full_list. */
|
|
while (1)
|
|
{
|
|
/* Check for beginning and end of log. */
|
|
if (record_full_list == cur_record_full_list)
|
|
break;
|
|
|
|
record_full_exec_insn (regcache, gdbarch, record_full_list);
|
|
|
|
if (record_full_list->prev)
|
|
record_full_list = record_full_list->prev;
|
|
}
|
|
|
|
unlink_file.keep ();
|
|
|
|
/* Succeeded. */
|
|
printf_filtered (_("Saved core file %s with execution log.\n"),
|
|
recfilename);
|
|
}
|
|
|
|
/* record_full_goto_insn -- rewind the record log (forward or backward,
|
|
depending on DIR) to the given entry, changing the program state
|
|
correspondingly. */
|
|
|
|
static void
|
|
record_full_goto_insn (struct record_full_entry *entry,
|
|
enum exec_direction_kind dir)
|
|
{
|
|
scoped_restore restore_operation_disable
|
|
= record_full_gdb_operation_disable_set ();
|
|
struct regcache *regcache = get_current_regcache ();
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
|
|
/* Assume everything is valid: we will hit the entry,
|
|
and we will not hit the end of the recording. */
|
|
|
|
if (dir == EXEC_FORWARD)
|
|
record_full_list = record_full_list->next;
|
|
|
|
do
|
|
{
|
|
record_full_exec_insn (regcache, gdbarch, record_full_list);
|
|
if (dir == EXEC_REVERSE)
|
|
record_full_list = record_full_list->prev;
|
|
else
|
|
record_full_list = record_full_list->next;
|
|
} while (record_full_list != entry);
|
|
}
|
|
|
|
/* Alias for "target record-full". */
|
|
|
|
static void
|
|
cmd_record_full_start (const char *args, int from_tty)
|
|
{
|
|
execute_command ("target record-full", from_tty);
|
|
}
|
|
|
|
static void
|
|
set_record_full_insn_max_num (const char *args, int from_tty,
|
|
struct cmd_list_element *c)
|
|
{
|
|
if (record_full_insn_num > record_full_insn_max_num)
|
|
{
|
|
/* Count down record_full_insn_num while releasing records from list. */
|
|
while (record_full_insn_num > record_full_insn_max_num)
|
|
{
|
|
record_full_list_release_first ();
|
|
record_full_insn_num--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The "set record full" command. */
|
|
|
|
static void
|
|
set_record_full_command (const char *args, int from_tty)
|
|
{
|
|
printf_unfiltered (_("\"set record full\" must be followed "
|
|
"by an appropriate subcommand.\n"));
|
|
help_list (set_record_full_cmdlist, "set record full ", all_commands,
|
|
gdb_stdout);
|
|
}
|
|
|
|
/* The "show record full" command. */
|
|
|
|
static void
|
|
show_record_full_command (const char *args, int from_tty)
|
|
{
|
|
cmd_show_list (show_record_full_cmdlist, from_tty, "");
|
|
}
|
|
|
|
void
|
|
_initialize_record_full (void)
|
|
{
|
|
struct cmd_list_element *c;
|
|
|
|
/* Init record_full_first. */
|
|
record_full_first.prev = NULL;
|
|
record_full_first.next = NULL;
|
|
record_full_first.type = record_full_end;
|
|
|
|
add_target (record_full_target_info, record_full_open);
|
|
add_deprecated_target_alias (record_full_target_info, "record");
|
|
add_target (record_full_core_target_info, record_full_open);
|
|
|
|
add_prefix_cmd ("full", class_obscure, cmd_record_full_start,
|
|
_("Start full execution recording."), &record_full_cmdlist,
|
|
"record full ", 0, &record_cmdlist);
|
|
|
|
c = add_cmd ("restore", class_obscure, cmd_record_full_restore,
|
|
_("Restore the execution log from a file.\n\
|
|
Argument is filename. File must be created with 'record save'."),
|
|
&record_full_cmdlist);
|
|
set_cmd_completer (c, filename_completer);
|
|
|
|
/* Deprecate the old version without "full" prefix. */
|
|
c = add_alias_cmd ("restore", "full restore", class_obscure, 1,
|
|
&record_cmdlist);
|
|
set_cmd_completer (c, filename_completer);
|
|
deprecate_cmd (c, "record full restore");
|
|
|
|
add_prefix_cmd ("full", class_support, set_record_full_command,
|
|
_("Set record options"), &set_record_full_cmdlist,
|
|
"set record full ", 0, &set_record_cmdlist);
|
|
|
|
add_prefix_cmd ("full", class_support, show_record_full_command,
|
|
_("Show record options"), &show_record_full_cmdlist,
|
|
"show record full ", 0, &show_record_cmdlist);
|
|
|
|
/* Record instructions number limit command. */
|
|
add_setshow_boolean_cmd ("stop-at-limit", no_class,
|
|
&record_full_stop_at_limit, _("\
|
|
Set whether record/replay stops when record/replay buffer becomes full."), _("\
|
|
Show whether record/replay stops when record/replay buffer becomes full."),
|
|
_("Default is ON.\n\
|
|
When ON, if the record/replay buffer becomes full, ask user what to do.\n\
|
|
When OFF, if the record/replay buffer becomes full,\n\
|
|
delete the oldest recorded instruction to make room for each new one."),
|
|
NULL, NULL,
|
|
&set_record_full_cmdlist, &show_record_full_cmdlist);
|
|
|
|
c = add_alias_cmd ("stop-at-limit", "full stop-at-limit", no_class, 1,
|
|
&set_record_cmdlist);
|
|
deprecate_cmd (c, "set record full stop-at-limit");
|
|
|
|
c = add_alias_cmd ("stop-at-limit", "full stop-at-limit", no_class, 1,
|
|
&show_record_cmdlist);
|
|
deprecate_cmd (c, "show record full stop-at-limit");
|
|
|
|
add_setshow_uinteger_cmd ("insn-number-max", no_class,
|
|
&record_full_insn_max_num,
|
|
_("Set record/replay buffer limit."),
|
|
_("Show record/replay buffer limit."), _("\
|
|
Set the maximum number of instructions to be stored in the\n\
|
|
record/replay buffer. A value of either \"unlimited\" or zero means no\n\
|
|
limit. Default is 200000."),
|
|
set_record_full_insn_max_num,
|
|
NULL, &set_record_full_cmdlist,
|
|
&show_record_full_cmdlist);
|
|
|
|
c = add_alias_cmd ("insn-number-max", "full insn-number-max", no_class, 1,
|
|
&set_record_cmdlist);
|
|
deprecate_cmd (c, "set record full insn-number-max");
|
|
|
|
c = add_alias_cmd ("insn-number-max", "full insn-number-max", no_class, 1,
|
|
&show_record_cmdlist);
|
|
deprecate_cmd (c, "show record full insn-number-max");
|
|
|
|
add_setshow_boolean_cmd ("memory-query", no_class,
|
|
&record_full_memory_query, _("\
|
|
Set whether query if PREC cannot record memory change of next instruction."),
|
|
_("\
|
|
Show whether query if PREC cannot record memory change of next instruction."),
|
|
_("\
|
|
Default is OFF.\n\
|
|
When ON, query if PREC cannot record memory change of next instruction."),
|
|
NULL, NULL,
|
|
&set_record_full_cmdlist,
|
|
&show_record_full_cmdlist);
|
|
|
|
c = add_alias_cmd ("memory-query", "full memory-query", no_class, 1,
|
|
&set_record_cmdlist);
|
|
deprecate_cmd (c, "set record full memory-query");
|
|
|
|
c = add_alias_cmd ("memory-query", "full memory-query", no_class, 1,
|
|
&show_record_cmdlist);
|
|
deprecate_cmd (c, "show record full memory-query");
|
|
}
|