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/* Target operations for the remote server for GDB.
   Copyright 2002
   Free Software Foundation, Inc.
 
   Contributed by MontaVista Software.
 
   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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */
 
#ifndef TARGET_H
#define TARGET_H
 
struct target_ops
{
  /* Start a new process.
 
     PROGRAM is a path to the program to execute.
     ARGS is a standard NULL-terminated array of arguments,
     to be passed to the inferior as ``argv''.
 
     Returns the new PID on success, -1 on failure.  Registers the new
     process with the process list.  */
 
  int (*create_inferior) (char *program, char **args);
 
  /* Attach to a running process.
 
     PID is the process ID to attach to, specified by the user
     or a higher layer.  */
 
  int (*attach) (int pid);
 
  /* Kill all inferiors.  */
 
  void (*kill) (void);
 
  /* Return 1 iff the thread with process ID PID is alive.  */
 
  int (*thread_alive) (int pid);
 
  /* Resume the inferior process.
 
     If STEP is non-zero, we want to single-step.
 
     If SIGNAL is nonzero, send the process that signal as we resume it.
   */
 
  void (*resume) (int step, int signo);
 
  /* Wait for the inferior process to change state.
 
     STATUSP will be filled in with a response code to send to GDB.
 
     Returns the signal which caused the process to stop.  */
 
  unsigned char (*wait) (char *status);
 
  /* Fetch registers from the inferior process.
 
     If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO.  */
 
  void (*fetch_registers) (int regno);
 
  /* Store registers to the inferior process.
 
     If REGNO is -1, store all registers; otherwise, store at least REGNO.  */
 
  void (*store_registers) (int regno);
 
  /* Read memory from the inferior process.  This should generally be
     called through read_inferior_memory, which handles breakpoint shadowing.
 
     Read LEN bytes at MEMADDR into a buffer at MYADDR.  */
 
  void (*read_memory) (CORE_ADDR memaddr, char *myaddr, int len);
 
  /* Write memory to the inferior process.  This should generally be
     called through write_inferior_memory, which handles breakpoint shadowing.
 
     Write LEN bytes from the buffer at MYADDR to MEMADDR.
 
     Returns 0 on success and errno on failure.  */
 
  int (*write_memory) (CORE_ADDR memaddr, const char *myaddr, int len);
 
  /* Query GDB for the values of any symbols we're interested in.
     This function is called whenever we receive a "qSymbols::"
     query, which corresponds to every time more symbols (might)
     become available.  NULL if we aren't interested in any
     symbols.  */
 
  void (*look_up_symbols) (void);
};
 
extern struct target_ops *the_target;
 
void set_target_ops (struct target_ops *);
 
#define create_inferior(program, args) \
  (*the_target->create_inferior) (program, args)
 
#define myattach(pid) \
  (*the_target->attach) (pid)
 
#define kill_inferior() \
  (*the_target->kill) ()
 
#define mythread_alive(pid) \
  (*the_target->thread_alive) (pid)
 
#define myresume(step,signo) \
  (*the_target->resume) (step, signo)
 
#define fetch_inferior_registers(regno) \
  (*the_target->fetch_registers) (regno)
 
#define store_inferior_registers(regno) \
  (*the_target->store_registers) (regno)
 
unsigned char mywait (char *statusp, int connected_wait);
 
void read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len);
 
int write_inferior_memory (CORE_ADDR memaddr, const char *myaddr, int len);
 
void set_desired_inferior (int id);
 
#endif /* TARGET_H */