696 lines
25 KiB
C++
696 lines
25 KiB
C++
/* Target operations for the remote server for GDB.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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Contributed by MontaVista Software.
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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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#ifndef GDBSERVER_TARGET_H
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#define GDBSERVER_TARGET_H
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#include <sys/types.h> /* for mode_t */
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#include "target/target.h"
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#include "target/resume.h"
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#include "target/wait.h"
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#include "target/waitstatus.h"
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#include "mem-break.h"
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#include "gdbsupport/btrace-common.h"
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#include <vector>
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struct emit_ops;
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struct buffer;
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struct process_info;
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/* This structure describes how to resume a particular thread (or all
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threads) based on the client's request. If thread is -1, then this
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entry applies to all threads. These are passed around as an
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array. */
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struct thread_resume
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{
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ptid_t thread;
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/* How to "resume". */
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enum resume_kind kind;
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/* If non-zero, send this signal when we resume, or to stop the
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thread. If stopping a thread, and this is 0, the target should
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stop the thread however it best decides to (e.g., SIGSTOP on
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linux; SuspendThread on win32). This is a host signal value (not
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enum gdb_signal). */
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int sig;
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/* Range to single step within. Valid only iff KIND is resume_step.
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Single-step once, and then continuing stepping as long as the
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thread stops in this range. (If the range is empty
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[STEP_RANGE_START == STEP_RANGE_END], then this is a single-step
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request.) */
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CORE_ADDR step_range_start; /* Inclusive */
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CORE_ADDR step_range_end; /* Exclusive */
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};
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class process_target;
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/* GDBserver doesn't have a concept of strata like GDB, but we call
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its target vector "process_stratum" anyway for the benefit of
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shared code. */
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struct process_stratum_target
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{
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/* The object that will gradually replace this struct. */
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process_target *pt;
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};
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class process_target
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{
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public:
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virtual ~process_target () = default;
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/* Start a new process.
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PROGRAM is a path to the program to execute.
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PROGRAM_ARGS is a standard NULL-terminated array of arguments,
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to be passed to the inferior as ``argv'' (along with PROGRAM).
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Returns the new PID on success, -1 on failure. Registers the new
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process with the process list. */
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virtual int create_inferior (const char *program,
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const std::vector<char *> &program_args) = 0;
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/* Do additional setup after a new process is created, including
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exec-wrapper completion. */
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virtual void post_create_inferior ();
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/* Attach to a running process.
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PID is the process ID to attach to, specified by the user
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or a higher layer.
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Returns -1 if attaching is unsupported, 0 on success, and calls
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error() otherwise. */
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virtual int attach (unsigned long pid) = 0;
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/* Kill process PROC. Return -1 on failure, and 0 on success. */
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virtual int kill (process_info *proc) = 0;
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/* Detach from process PROC. Return -1 on failure, and 0 on
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success. */
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virtual int detach (process_info *proc) = 0;
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/* The inferior process has died. Do what is right. */
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virtual void mourn (process_info *proc) = 0;
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/* Wait for process PID to exit. */
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virtual void join (int pid) = 0;
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/* Return true iff the thread with process ID PID is alive. */
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virtual bool thread_alive (ptid_t pid) = 0;
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/* Resume the inferior process. */
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virtual void resume (thread_resume *resume_info, size_t n) = 0;
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/* Wait for the inferior process or thread to change state. Store
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status through argument pointer STATUS.
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PTID = -1 to wait for any pid to do something, PTID(pid,0,0) to
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wait for any thread of process pid to do something. Return ptid
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of child, or -1 in case of error; store status through argument
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pointer STATUS. OPTIONS is a bit set of options defined as
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TARGET_W* above. If options contains TARGET_WNOHANG and there's
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no child stop to report, return is
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null_ptid/TARGET_WAITKIND_IGNORE. */
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virtual ptid_t wait (ptid_t ptid, target_waitstatus *status,
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int options) = 0;
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/* Fetch registers from the inferior process.
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If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO. */
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virtual void fetch_registers (regcache *regcache, int regno) = 0;
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/* Store registers to the inferior process.
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If REGNO is -1, store all registers; otherwise, store at least REGNO. */
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virtual void store_registers (regcache *regcache, int regno) = 0;
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/* Prepare to read or write memory from the inferior process.
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Targets use this to do what is necessary to get the state of the
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inferior such that it is possible to access memory.
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This should generally only be called from client facing routines,
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such as gdb_read_memory/gdb_write_memory, or the GDB breakpoint
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insertion routine.
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Like `read_memory' and `write_memory' below, returns 0 on success
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and errno on failure. */
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virtual int prepare_to_access_memory ();
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/* Undo the effects of prepare_to_access_memory. */
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virtual void done_accessing_memory ();
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/* Read memory from the inferior process. This should generally be
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called through read_inferior_memory, which handles breakpoint shadowing.
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Read LEN bytes at MEMADDR into a buffer at MYADDR.
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Returns 0 on success and errno on failure. */
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virtual int read_memory (CORE_ADDR memaddr, unsigned char *myaddr,
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int len) = 0;
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/* Write memory to the inferior process. This should generally be
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called through target_write_memory, which handles breakpoint shadowing.
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Write LEN bytes from the buffer at MYADDR to MEMADDR.
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Returns 0 on success and errno on failure. */
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virtual int write_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
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int len) = 0;
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/* Query GDB for the values of any symbols we're interested in.
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This function is called whenever we receive a "qSymbols::"
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query, which corresponds to every time more symbols (might)
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become available. */
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virtual void look_up_symbols ();
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/* Send an interrupt request to the inferior process,
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however is appropriate. */
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virtual void request_interrupt () = 0;
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/* Return true if the read_auxv target op is supported. */
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virtual bool supports_read_auxv ();
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/* Read auxiliary vector data from the inferior process.
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Read LEN bytes at OFFSET into a buffer at MYADDR. */
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virtual int read_auxv (CORE_ADDR offset, unsigned char *myaddr,
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unsigned int len);
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/* Returns true if GDB Z breakpoint type TYPE is supported, false
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otherwise. The type is coded as follows:
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'0' - software-breakpoint
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'1' - hardware-breakpoint
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'2' - write watchpoint
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'3' - read watchpoint
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'4' - access watchpoint
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*/
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virtual bool supports_z_point_type (char z_type);
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/* Insert and remove a break or watchpoint.
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Returns 0 on success, -1 on failure and 1 on unsupported. */
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virtual int insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
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int size, raw_breakpoint *bp);
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virtual int remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
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int size, raw_breakpoint *bp);
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/* Returns true if the target stopped because it executed a software
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breakpoint instruction, false otherwise. */
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virtual bool stopped_by_sw_breakpoint ();
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/* Returns true if the target knows whether a trap was caused by a
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SW breakpoint triggering. */
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virtual bool supports_stopped_by_sw_breakpoint ();
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/* Returns true if the target stopped for a hardware breakpoint. */
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virtual bool stopped_by_hw_breakpoint ();
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/* Returns true if the target knows whether a trap was caused by a
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HW breakpoint triggering. */
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virtual bool supports_stopped_by_hw_breakpoint ();
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/* Returns true if the target can do hardware single step. */
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virtual bool supports_hardware_single_step ();
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/* Returns true if target was stopped due to a watchpoint hit, false
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otherwise. */
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virtual bool stopped_by_watchpoint ();
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/* Returns the address associated with the watchpoint that hit, if any;
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returns 0 otherwise. */
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virtual CORE_ADDR stopped_data_address ();
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/* Return true if the read_offsets target op is supported. */
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virtual bool supports_read_offsets ();
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/* Reports the text, data offsets of the executable. This is
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needed for uclinux where the executable is relocated during load
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time. */
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virtual int read_offsets (CORE_ADDR *text, CORE_ADDR *data);
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/* Return true if the get_tls_address target op is supported. */
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virtual bool supports_get_tls_address ();
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/* Fetch the address associated with a specific thread local storage
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area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
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Stores it in *ADDRESS and returns zero on success; otherwise returns
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an error code. A return value of -1 means this system does not
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support the operation. */
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virtual int get_tls_address (thread_info *thread, CORE_ADDR offset,
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CORE_ADDR load_module, CORE_ADDR *address);
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/* Fill BUF with an hostio error packet representing the last hostio
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error. */
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virtual void hostio_last_error (char *buf);
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/* Return true if the qxfer_osdata target op is supported. */
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virtual bool supports_qxfer_osdata ();
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/* Read/Write OS data using qXfer packets. */
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virtual int qxfer_osdata (const char *annex, unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len);
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/* Return true if the qxfer_siginfo target op is supported. */
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virtual bool supports_qxfer_siginfo ();
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/* Read/Write extra signal info. */
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virtual int qxfer_siginfo (const char *annex, unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len);
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/* Return true if non-stop mode is supported. */
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virtual bool supports_non_stop ();
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/* Enables async target events. Returns the previous enable
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state. */
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virtual bool async (bool enable);
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/* Switch to non-stop (ENABLE == true) or all-stop (ENABLE == false)
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mode. Return 0 on success, -1 otherwise. */
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virtual int start_non_stop (bool enable);
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/* Returns true if the target supports multi-process debugging. */
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virtual bool supports_multi_process ();
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/* Returns true if fork events are supported. */
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virtual bool supports_fork_events ();
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/* Returns true if vfork events are supported. */
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virtual bool supports_vfork_events ();
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/* Returns true if exec events are supported. */
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virtual bool supports_exec_events ();
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/* Allows target to re-initialize connection-specific settings. */
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virtual void handle_new_gdb_connection ();
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/* The target-specific routine to process monitor command.
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Returns 1 if handled, or 0 to perform default processing. */
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virtual int handle_monitor_command (char *mon);
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/* Returns the core given a thread, or -1 if not known. */
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virtual int core_of_thread (ptid_t ptid);
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/* Returns true if the read_loadmap target op is supported. */
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virtual bool supports_read_loadmap ();
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/* Read loadmaps. Read LEN bytes at OFFSET into a buffer at MYADDR. */
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virtual int read_loadmap (const char *annex, CORE_ADDR offset,
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unsigned char *myaddr, unsigned int len);
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/* Target specific qSupported support. FEATURES is an array of
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features with COUNT elements. */
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virtual void process_qsupported (char **features, int count);
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/* Return true if the target supports tracepoints, false otherwise. */
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virtual bool supports_tracepoints ();
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/* Read PC from REGCACHE. */
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virtual CORE_ADDR read_pc (regcache *regcache);
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/* Write PC to REGCACHE. */
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virtual void write_pc (regcache *regcache, CORE_ADDR pc);
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/* Return true if the thread_stopped op is supported. */
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virtual bool supports_thread_stopped ();
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/* Return true if THREAD is known to be stopped now. */
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virtual bool thread_stopped (thread_info *thread);
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/* Return true if the get_tib_address op is supported. */
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virtual bool supports_get_tib_address ();
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/* Read Thread Information Block address. */
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virtual int get_tib_address (ptid_t ptid, CORE_ADDR *address);
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/* Pause all threads. If FREEZE, arrange for any resume attempt to
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be ignored until an unpause_all call unfreezes threads again.
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There can be nested calls to pause_all, so a freeze counter
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should be maintained. */
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virtual void pause_all (bool freeze);
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/* Unpause all threads. Threads that hadn't been resumed by the
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client should be left stopped. Basically a pause/unpause call
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pair should not end up resuming threads that were stopped before
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the pause call. */
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virtual void unpause_all (bool unfreeze);
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/* Stabilize all threads. That is, force them out of jump pads. */
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virtual void stabilize_threads ();
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/* Return true if the install_fast_tracepoint_jump_pad op is
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supported. */
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virtual bool supports_fast_tracepoints ();
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/* Install a fast tracepoint jump pad. TPOINT is the address of the
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tracepoint internal object as used by the IPA agent. TPADDR is
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the address of tracepoint. COLLECTOR is address of the function
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the jump pad redirects to. LOCKADDR is the address of the jump
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pad lock object. ORIG_SIZE is the size in bytes of the
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instruction at TPADDR. JUMP_ENTRY points to the address of the
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jump pad entry, and on return holds the address past the end of
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the created jump pad. If a trampoline is created by the function,
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then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
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the trampoline, else they remain unchanged. JJUMP_PAD_INSN is a
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buffer containing a copy of the instruction at TPADDR.
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ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
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return the address range where the instruction at TPADDR was relocated
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to. If an error occurs, the ERR may be used to pass on an error
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message. */
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virtual int install_fast_tracepoint_jump_pad
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(CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector,
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CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry,
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CORE_ADDR *trampoline, ULONGEST *trampoline_size,
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unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size,
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CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end,
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char *err);
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/* Return the minimum length of an instruction that can be safely
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overwritten for use as a fast tracepoint. */
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virtual int get_min_fast_tracepoint_insn_len ();
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/* Return the bytecode operations vector for the current inferior.
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Returns nullptr if bytecode compilation is not supported. */
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virtual struct emit_ops *emit_ops ();
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/* Returns true if the target supports disabling randomization. */
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virtual bool supports_disable_randomization ();
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/* Return true if the qxfer_libraries_svr4 op is supported. */
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virtual bool supports_qxfer_libraries_svr4 ();
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/* Read solib info on SVR4 platforms. */
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virtual int qxfer_libraries_svr4 (const char *annex,
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unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len);
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/* Return true if target supports debugging agent. */
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virtual bool supports_agent ();
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/* Enable branch tracing for PTID based on CONF and allocate a branch trace
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target information struct for reading and for disabling branch trace. */
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virtual btrace_target_info *enable_btrace (ptid_t ptid,
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const btrace_config *conf);
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/* Disable branch tracing.
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Returns zero on success, non-zero otherwise. */
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virtual int disable_btrace (btrace_target_info *tinfo);
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/* Read branch trace data into buffer.
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Return 0 on success; print an error message into BUFFER and return -1,
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otherwise. */
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virtual int read_btrace (btrace_target_info *tinfo, buffer *buf,
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enum btrace_read_type type);
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/* Read the branch trace configuration into BUFFER.
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Return 0 on success; print an error message into BUFFER and return -1
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otherwise. */
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virtual int read_btrace_conf (const btrace_target_info *tinfo,
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buffer *buf);
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/* Return true if target supports range stepping. */
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virtual bool supports_range_stepping ();
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/* Return true if the pid_to_exec_file op is supported. */
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virtual bool supports_pid_to_exec_file ();
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/* Return the full absolute name of the executable file that was
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run to create the process PID. If the executable file cannot
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be determined, NULL is returned. Otherwise, a pointer to a
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character string containing the pathname is returned. This
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string should be copied into a buffer by the client if the string
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will not be immediately used, or if it must persist. */
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virtual char *pid_to_exec_file (int pid);
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/* Return true if any of the multifs ops is supported. */
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virtual bool supports_multifs ();
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/* Multiple-filesystem-aware open. Like open(2), but operating in
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the filesystem as it appears to process PID. Systems where all
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processes share a common filesystem should not override this.
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The default behavior is to use open(2). */
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virtual int multifs_open (int pid, const char *filename,
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int flags, mode_t mode);
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/* Multiple-filesystem-aware unlink. Like unlink(2), but operates
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in the filesystem as it appears to process PID. Systems where
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all processes share a common filesystem should not override this.
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The default behavior is to use unlink(2). */
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virtual int multifs_unlink (int pid, const char *filename);
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/* Multiple-filesystem-aware readlink. Like readlink(2), but
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operating in the filesystem as it appears to process PID.
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Systems where all processes share a common filesystem should
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not override this. The default behavior is to use readlink(2). */
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virtual ssize_t multifs_readlink (int pid, const char *filename,
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char *buf, size_t bufsiz);
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/* Return the breakpoint kind for this target based on PC. The
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PCPTR is adjusted to the real memory location in case a flag
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(e.g., the Thumb bit on ARM) was present in the PC. */
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virtual int breakpoint_kind_from_pc (CORE_ADDR *pcptr);
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/* Return the software breakpoint from KIND. KIND can have target
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specific meaning like the Z0 kind parameter.
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SIZE is set to the software breakpoint's length in memory. */
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virtual const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) = 0;
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/* Return the breakpoint kind for this target based on the current
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processor state (e.g. the current instruction mode on ARM) and the
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PC. The PCPTR is adjusted to the real memory location in case a
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flag (e.g., the Thumb bit on ARM) is present in the PC. */
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virtual int breakpoint_kind_from_current_state (CORE_ADDR *pcptr);
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/* Return the thread's name, or NULL if the target is unable to
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determine it. The returned value must not be freed by the
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caller. */
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virtual const char *thread_name (ptid_t thread);
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/* Thread ID to (numeric) thread handle: Return true on success and
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false for failure. Return pointer to thread handle via HANDLE
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and the handle's length via HANDLE_LEN. */
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virtual bool thread_handle (ptid_t ptid, gdb_byte **handle,
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int *handle_len);
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/* Returns true if the target can software single step. */
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virtual bool supports_software_single_step ();
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|
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/* Return true if the target supports catch syscall. */
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virtual bool supports_catch_syscall ();
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|
|
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/* Return tdesc index for IPA. */
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virtual int get_ipa_tdesc_idx ();
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};
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|
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extern process_stratum_target *the_target;
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|
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void set_target_ops (process_stratum_target *);
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|
|
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#define target_create_inferior(program, program_args) \
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the_target->pt->create_inferior (program, program_args)
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|
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#define target_post_create_inferior() \
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the_target->pt->post_create_inferior ()
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|
|
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#define myattach(pid) \
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the_target->pt->attach (pid)
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|
|
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int kill_inferior (process_info *proc);
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|
|
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#define target_supports_fork_events() \
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the_target->pt->supports_fork_events ()
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|
|
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#define target_supports_vfork_events() \
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the_target->pt->supports_vfork_events ()
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|
|
|
#define target_supports_exec_events() \
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the_target->pt->supports_exec_events ()
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|
|
|
#define target_handle_new_gdb_connection() \
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the_target->pt->handle_new_gdb_connection ()
|
|
|
|
#define detach_inferior(proc) \
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the_target->pt->detach (proc)
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|
|
|
#define mythread_alive(pid) \
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the_target->pt->thread_alive (pid)
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|
|
|
#define fetch_inferior_registers(regcache, regno) \
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the_target->pt->fetch_registers (regcache, regno)
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|
|
|
#define store_inferior_registers(regcache, regno) \
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|
the_target->pt->store_registers (regcache, regno)
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|
|
|
#define join_inferior(pid) \
|
|
the_target->pt->join (pid)
|
|
|
|
#define target_supports_non_stop() \
|
|
the_target->pt->supports_non_stop ()
|
|
|
|
#define target_async(enable) \
|
|
the_target->pt->async (enable)
|
|
|
|
#define target_process_qsupported(features, count) \
|
|
the_target->pt->process_qsupported (features, count)
|
|
|
|
#define target_supports_catch_syscall() \
|
|
the_target->pt->supports_catch_syscall ()
|
|
|
|
#define target_get_ipa_tdesc_idx() \
|
|
the_target->pt->get_ipa_tdesc_idx ()
|
|
|
|
#define target_supports_tracepoints() \
|
|
the_target->pt->supports_tracepoints ()
|
|
|
|
#define target_supports_fast_tracepoints() \
|
|
the_target->pt->supports_fast_tracepoints ()
|
|
|
|
#define target_get_min_fast_tracepoint_insn_len() \
|
|
the_target->pt->get_min_fast_tracepoint_insn_len ()
|
|
|
|
#define target_thread_stopped(thread) \
|
|
the_target->pt->thread_stopped (thread)
|
|
|
|
#define target_pause_all(freeze) \
|
|
the_target->pt->pause_all (freeze)
|
|
|
|
#define target_unpause_all(unfreeze) \
|
|
the_target->pt->unpause_all (unfreeze)
|
|
|
|
#define target_stabilize_threads() \
|
|
the_target->pt->stabilize_threads ()
|
|
|
|
#define target_install_fast_tracepoint_jump_pad(tpoint, tpaddr, \
|
|
collector, lockaddr, \
|
|
orig_size, \
|
|
jump_entry, \
|
|
trampoline, trampoline_size, \
|
|
jjump_pad_insn, \
|
|
jjump_pad_insn_size, \
|
|
adjusted_insn_addr, \
|
|
adjusted_insn_addr_end, \
|
|
err) \
|
|
the_target->pt->install_fast_tracepoint_jump_pad (tpoint, tpaddr, \
|
|
collector,lockaddr, \
|
|
orig_size, jump_entry, \
|
|
trampoline, \
|
|
trampoline_size, \
|
|
jjump_pad_insn, \
|
|
jjump_pad_insn_size, \
|
|
adjusted_insn_addr, \
|
|
adjusted_insn_addr_end, \
|
|
err)
|
|
|
|
#define target_emit_ops() \
|
|
the_target->pt->emit_ops ()
|
|
|
|
#define target_supports_disable_randomization() \
|
|
the_target->pt->supports_disable_randomization ()
|
|
|
|
#define target_supports_agent() \
|
|
the_target->pt->supports_agent ()
|
|
|
|
static inline struct btrace_target_info *
|
|
target_enable_btrace (ptid_t ptid, const struct btrace_config *conf)
|
|
{
|
|
return the_target->pt->enable_btrace (ptid, conf);
|
|
}
|
|
|
|
static inline int
|
|
target_disable_btrace (struct btrace_target_info *tinfo)
|
|
{
|
|
return the_target->pt->disable_btrace (tinfo);
|
|
}
|
|
|
|
static inline int
|
|
target_read_btrace (struct btrace_target_info *tinfo,
|
|
struct buffer *buffer,
|
|
enum btrace_read_type type)
|
|
{
|
|
return the_target->pt->read_btrace (tinfo, buffer, type);
|
|
}
|
|
|
|
static inline int
|
|
target_read_btrace_conf (struct btrace_target_info *tinfo,
|
|
struct buffer *buffer)
|
|
{
|
|
return the_target->pt->read_btrace_conf (tinfo, buffer);
|
|
}
|
|
|
|
#define target_supports_range_stepping() \
|
|
the_target->pt->supports_range_stepping ()
|
|
|
|
#define target_supports_stopped_by_sw_breakpoint() \
|
|
the_target->pt->supports_stopped_by_sw_breakpoint ()
|
|
|
|
#define target_stopped_by_sw_breakpoint() \
|
|
the_target->pt->stopped_by_sw_breakpoint ()
|
|
|
|
#define target_supports_stopped_by_hw_breakpoint() \
|
|
the_target->pt->supports_stopped_by_hw_breakpoint ()
|
|
|
|
#define target_supports_hardware_single_step() \
|
|
the_target->pt->supports_hardware_single_step ()
|
|
|
|
#define target_stopped_by_hw_breakpoint() \
|
|
the_target->pt->stopped_by_hw_breakpoint ()
|
|
|
|
#define target_breakpoint_kind_from_pc(pcptr) \
|
|
the_target->pt->breakpoint_kind_from_pc (pcptr)
|
|
|
|
#define target_breakpoint_kind_from_current_state(pcptr) \
|
|
the_target->pt->breakpoint_kind_from_current_state (pcptr)
|
|
|
|
#define target_supports_software_single_step() \
|
|
the_target->pt->supports_software_single_step ()
|
|
|
|
ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
|
|
int connected_wait);
|
|
|
|
/* Prepare to read or write memory from the inferior process. See the
|
|
corresponding process_stratum_target methods for more details. */
|
|
|
|
int prepare_to_access_memory (void);
|
|
void done_accessing_memory (void);
|
|
|
|
#define target_core_of_thread(ptid) \
|
|
the_target->pt->core_of_thread (ptid)
|
|
|
|
#define target_thread_name(ptid) \
|
|
the_target->pt->thread_name (ptid)
|
|
|
|
#define target_thread_handle(ptid, handle, handle_len) \
|
|
the_target->pt->thread_handle (ptid, handle, handle_len)
|
|
|
|
int read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len);
|
|
|
|
int set_desired_thread ();
|
|
|
|
const char *target_pid_to_str (ptid_t);
|
|
|
|
#endif /* GDBSERVER_TARGET_H */
|