win32-low.h

/* Internal interfaces for the Win32 specific target code for gdbserver.
   Copyright (C) 2007-2024 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef GDBSERVER_WIN32_LOW_H
#define GDBSERVER_WIN32_LOW_H

#include <windows.h>
#include "nat/windows-nat.h"
#include "gdbsupport/osabi.h"

struct target_desc;

/* The inferior's target description.  This is a global because the
   Windows ports support neither bi-arch nor multi-process.  */
extern const struct target_desc *win32_tdesc;
#ifdef __x86_64__
extern const struct target_desc *wow64_win32_tdesc;
#endif

#ifdef __CYGWIN__
constexpr enum gdb_osabi WINDOWS_OSABI = GDB_OSABI_CYGWIN;
#else
constexpr enum gdb_osabi WINDOWS_OSABI = GDB_OSABI_WINDOWS;
#endif

struct win32_target_ops
{
  /* Architecture-specific setup.  */
  void (*arch_setup) (void);

  /* The number of target registers.  */
  int (*num_regs) (void);

  /* Perform initializations on startup.  */
  void (*initial_stuff) (void);

  /* Fetch the context from the inferior.  */
  void (*get_thread_context) (windows_nat::windows_thread_info *th);

  /* Called just before resuming the thread.  */
  void (*prepare_to_resume) (windows_nat::windows_thread_info *th);

  /* Called when a thread was added.  */
  void (*thread_added) (windows_nat::windows_thread_info *th);

  /* Fetch register from gdbserver regcache data.  */
  void (*fetch_inferior_register) (struct regcache *regcache,
				   windows_nat::windows_thread_info *th,
				   int r);

  /* Store a new register value into the thread context of TH.  */
  void (*store_inferior_register) (struct regcache *regcache,
				   windows_nat::windows_thread_info *th,
				   int r);

  void (*single_step) (windows_nat::windows_thread_info *th);

  const unsigned char *breakpoint;
  int breakpoint_len;

  /* Amount by which to decrement the PC after a breakpoint is
     hit.  */
  int decr_pc_after_break;

  /* Get the PC register from REGCACHE.  */
  CORE_ADDR (*get_pc) (struct regcache *regcache);
  /* Set the PC register in REGCACHE.  */
  void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);

  /* Breakpoint/Watchpoint related functions.  See target.h for comments.  */
  int (*supports_z_point_type) (char z_type);
  int (*insert_point) (enum raw_bkpt_type type, CORE_ADDR addr,
		       int size, struct raw_breakpoint *bp);
  int (*remove_point) (enum raw_bkpt_type type, CORE_ADDR addr,
		       int size, struct raw_breakpoint *bp);
  int (*stopped_by_watchpoint) (void);
  CORE_ADDR (*stopped_data_address) (void);
};

extern struct win32_target_ops the_low_target;

/* Target ops definitions for a Win32 target.  */

class win32_process_target : public process_stratum_target
{
public:

  int create_inferior (const char *program,
		       const std::string &program_args) override;

  int attach (unsigned long pid) override;

  int kill (process_info *proc) override;

  int detach (process_info *proc) override;

  void mourn (process_info *proc) override;

  void join (int pid) override;

  bool thread_alive (ptid_t pid) override;

  void resume (thread_resume *resume_info, size_t n) override;

  ptid_t wait (ptid_t ptid, target_waitstatus *status,
	       target_wait_flags options) override;

  void fetch_registers (regcache *regcache, int regno) override;

  void store_registers (regcache *regcache, int regno) override;

  int read_memory (CORE_ADDR memaddr, unsigned char *myaddr,
		   int len) override;

  int write_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
		    int len) override;

  void request_interrupt () override;

  bool supports_z_point_type (char z_type) override;

  int insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
		    int size, raw_breakpoint *bp) override;

  int remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
		    int size, raw_breakpoint *bp) override;

  bool supports_hardware_single_step () override;

  bool stopped_by_watchpoint () override;

  CORE_ADDR stopped_data_address () override;

  bool supports_qxfer_siginfo () override;

  int qxfer_siginfo (const char *annex, unsigned char *readbuf,
		     unsigned const char *writebuf,
		     CORE_ADDR offset, int len) override;

  bool supports_get_tib_address () override;

  int get_tib_address (ptid_t ptid, CORE_ADDR *addr) override;

  const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;

  CORE_ADDR read_pc (regcache *regcache) override;

  void write_pc (regcache *regcache, CORE_ADDR pc) override;

  bool stopped_by_sw_breakpoint () override;

  bool supports_stopped_by_sw_breakpoint () override;

  const char *thread_name (ptid_t thread) override;

  bool supports_pid_to_exec_file () override
  { return true; }

  const char *pid_to_exec_file (int pid) override;

  bool supports_disable_randomization () override
  {
    return windows_nat::disable_randomization_available ();
  }
};

struct gdbserver_windows_process : public windows_nat::windows_process_info
{
  windows_nat::windows_thread_info *thread_rec
       (ptid_t ptid,
	windows_nat::thread_disposition_type disposition) override;
  int handle_output_debug_string (struct target_waitstatus *ourstatus) override;
  void handle_load_dll (const char *dll_name, LPVOID base) override;
  void handle_unload_dll () override;
  bool handle_access_violation (const EXCEPTION_RECORD *rec) override;

  int attaching = 0;

  /* A status that hasn't been reported to the core yet, and so
     win32_wait should return it next, instead of fetching the next
     debug event off the win32 API.  */
  struct target_waitstatus cached_status;

  /* Non zero if an interrupt request is to be satisfied by suspending
     all threads.  */
  int soft_interrupt_requested = 0;

  /* Non zero if the inferior is stopped in a simulated breakpoint done
     by suspending all the threads.  */
  int faked_breakpoint = 0;

  /* True if current_process_handle needs to be closed.  */
  bool open_process_used = false;

  /* Zero during the child initialization phase, and nonzero
     otherwise.  */
  int child_initialization_done = 0;
};

/* The sole Windows process.  */
extern gdbserver_windows_process windows_process;

/* Retrieve the context for this thread, if not already retrieved.  */
extern void win32_require_context (windows_nat::windows_thread_info *th);

#endif /* GDBSERVER_WIN32_LOW_H */