Subversion Repositories openrisc_2011-10-31

/* Interface between GDB and target environments, including files and processes

   Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,

   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Cygnus Support.  Written by John Gilmore.

   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/>.  */

#if !defined (TARGET_H)

#define TARGET_H

struct objfile;

struct ui_file;

struct mem_attrib;

struct target_ops;

struct bp_target_info;

struct regcache;

/* This include file defines the interface between the main part

   of the debugger, and the part which is target-specific, or

   specific to the communications interface between us and the

   target.

   A TARGET is an interface between the debugger and a particular

   kind of file or process.  Targets can be STACKED in STRATA,

   so that more than one target can potentially respond to a request.

   In particular, memory accesses will walk down the stack of targets

   until they find a target that is interested in handling that particular

   address.  STRATA are artificial boundaries on the stack, within

   which particular kinds of targets live.  Strata exist so that

   people don't get confused by pushing e.g. a process target and then

   a file target, and wondering why they can't see the current values

   of variables any more (the file target is handling them and they

   never get to the process target).  So when you push a file target,

   it goes into the file stratum, which is always below the process

   stratum.  */

#include "bfd.h"

#include "symtab.h"

#include "dcache.h"

#include "memattr.h"

#include "vec.h"

enum strata

  {

    dummy_stratum,              /* The lowest of the low */

    file_stratum,               /* Executable files, etc */

    core_stratum,               /* Core dump files */

    download_stratum,           /* Downloading of remote targets */

    process_stratum,            /* Executing processes */

    thread_stratum              /* Executing threads */

  };

enum thread_control_capabilities

  {

    tc_none = 0,         /* Default: can't control thread execution.  */

    tc_schedlock = 1,           /* Can lock the thread scheduler.  */

    tc_switch = 2               /* Can switch the running thread on demand.  */

  };

/* Stuff for target_wait.  */

/* Generally, what has the program done?  */

enum target_waitkind

  {

    /* The program has exited.  The exit status is in value.integer.  */

    TARGET_WAITKIND_EXITED,

    /* The program has stopped with a signal.  Which signal is in

       value.sig.  */

    TARGET_WAITKIND_STOPPED,

    /* The program has terminated with a signal.  Which signal is in

       value.sig.  */

    TARGET_WAITKIND_SIGNALLED,

    /* The program is letting us know that it dynamically loaded something

       (e.g. it called load(2) on AIX).  */

    TARGET_WAITKIND_LOADED,

    /* The program has forked.  A "related" process' ID is in

       value.related_pid.  I.e., if the child forks, value.related_pid

       is the parent's ID.  */

    TARGET_WAITKIND_FORKED,

    /* The program has vforked.  A "related" process's ID is in

       value.related_pid.  */

    TARGET_WAITKIND_VFORKED,

    /* The program has exec'ed a new executable file.  The new file's

       pathname is pointed to by value.execd_pathname.  */

    TARGET_WAITKIND_EXECD,

    /* The program has entered or returned from a system call.  On

       HP-UX, this is used in the hardware watchpoint implementation.

       The syscall's unique integer ID number is in value.syscall_id */

    TARGET_WAITKIND_SYSCALL_ENTRY,

    TARGET_WAITKIND_SYSCALL_RETURN,

    /* Nothing happened, but we stopped anyway.  This perhaps should be handled

       within target_wait, but I'm not sure target_wait should be resuming the

       inferior.  */

    TARGET_WAITKIND_SPURIOUS,

    /* An event has occured, but we should wait again.

       Remote_async_wait() returns this when there is an event

       on the inferior, but the rest of the world is not interested in

       it. The inferior has not stopped, but has just sent some output

       to the console, for instance. In this case, we want to go back

       to the event loop and wait there for another event from the

       inferior, rather than being stuck in the remote_async_wait()

       function. This way the event loop is responsive to other events,

       like for instance the user typing.  */

    TARGET_WAITKIND_IGNORE

  };

struct target_waitstatus

  {

    enum target_waitkind kind;

    /* Forked child pid, execd pathname, exit status or signal number.  */

    union

      {

        int integer;

        enum target_signal sig;

        int related_pid;

        char *execd_pathname;

        int syscall_id;

      }

    value;

  };

/* Possible types of events that the inferior handler will have to

   deal with.  */

enum inferior_event_type

  {

    /* There is a request to quit the inferior, abandon it.  */

    INF_QUIT_REQ,

    /* Process a normal inferior event which will result in target_wait

       being called.  */

    INF_REG_EVENT,

    /* Deal with an error on the inferior.  */

    INF_ERROR,

    /* We are called because a timer went off.  */

    INF_TIMER,

    /* We are called to do stuff after the inferior stops.  */

    INF_EXEC_COMPLETE,

    /* We are called to do some stuff after the inferior stops, but we

       are expected to reenter the proceed() and

       handle_inferior_event() functions. This is used only in case of

       'step n' like commands.  */

    INF_EXEC_CONTINUE

  };

/* Return the string for a signal.  */

extern char *target_signal_to_string (enum target_signal);

/* Return the name (SIGHUP, etc.) for a signal.  */

extern char *target_signal_to_name (enum target_signal);

/* Given a name (SIGHUP, etc.), return its signal.  */

enum target_signal target_signal_from_name (char *);

/* Target objects which can be transfered using target_read,

   target_write, et cetera.  */

enum target_object

{

  /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */

  TARGET_OBJECT_AVR,

  /* SPU target specific transfer.  See "spu-tdep.c".  */

  TARGET_OBJECT_SPU,

  /* Transfer up-to LEN bytes of memory starting at OFFSET.  */

  TARGET_OBJECT_MEMORY,

  /* Memory, avoiding GDB's data cache and trusting the executable.

     Target implementations of to_xfer_partial never need to handle

     this object, and most callers should not use it.  */

  TARGET_OBJECT_RAW_MEMORY,

  /* Kernel Unwind Table.  See "ia64-tdep.c".  */

  TARGET_OBJECT_UNWIND_TABLE,

  /* Transfer auxilliary vector.  */

  TARGET_OBJECT_AUXV,

  /* StackGhost cookie.  See "sparc-tdep.c".  */

  TARGET_OBJECT_WCOOKIE,

  /* Target memory map in XML format.  */

  TARGET_OBJECT_MEMORY_MAP,

  /* Flash memory.  This object can be used to write contents to

     a previously erased flash memory.  Using it without erasing

     flash can have unexpected results.  Addresses are physical

     address on target, and not relative to flash start.  */

  TARGET_OBJECT_FLASH,

  /* Available target-specific features, e.g. registers and coprocessors.

     See "target-descriptions.c".  ANNEX should never be empty.  */

  TARGET_OBJECT_AVAILABLE_FEATURES,

  /* Currently loaded libraries, in XML format.  */

  TARGET_OBJECT_LIBRARIES

  /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */

};

/* Request that OPS transfer up to LEN 8-bit bytes of the target's

   OBJECT.  The OFFSET, for a seekable object, specifies the

   starting point.  The ANNEX can be used to provide additional

   data-specific information to the target.

   Return the number of bytes actually transfered, or -1 if the

   transfer is not supported or otherwise fails.  Return of a positive

   value less than LEN indicates that no further transfer is possible.

   Unlike the raw to_xfer_partial interface, callers of these

   functions do not need to retry partial transfers.  */

extern LONGEST target_read (struct target_ops *ops,

                            enum target_object object,

                            const char *annex, gdb_byte *buf,

                            ULONGEST offset, LONGEST len);

extern LONGEST target_write (struct target_ops *ops,

                             enum target_object object,

                             const char *annex, const gdb_byte *buf,

                             ULONGEST offset, LONGEST len);

/* Similar to target_write, except that it also calls PROGRESS with

   the number of bytes written and the opaque BATON after every

   successful partial write (and before the first write).  This is

   useful for progress reporting and user interaction while writing

   data.  To abort the transfer, the progress callback can throw an

   exception.  */

LONGEST target_write_with_progress (struct target_ops *ops,

                                    enum target_object object,

                                    const char *annex, const gdb_byte *buf,

                                    ULONGEST offset, LONGEST len,

                                    void (*progress) (ULONGEST, void *),

                                    void *baton);

/* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will

   be read using OPS.  The return value will be -1 if the transfer

   fails or is not supported; 0 if the object is empty; or the length

   of the object otherwise.  If a positive value is returned, a

   sufficiently large buffer will be allocated using xmalloc and

   returned in *BUF_P containing the contents of the object.

   This method should be used for objects sufficiently small to store

   in a single xmalloc'd buffer, when no fixed bound on the object's

   size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY

   through this function.  */

extern LONGEST target_read_alloc (struct target_ops *ops,

                                  enum target_object object,

                                  const char *annex, gdb_byte **buf_p);

/* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and

   returned as a string, allocated using xmalloc.  If an error occurs

   or the transfer is unsupported, NULL is returned.  Empty objects

   are returned as allocated but empty strings.  A warning is issued

   if the result contains any embedded NUL bytes.  */

extern char *target_read_stralloc (struct target_ops *ops,

                                   enum target_object object,

                                   const char *annex);

/* Wrappers to target read/write that perform memory transfers.  They

   throw an error if the memory transfer fails.

   NOTE: cagney/2003-10-23: The naming schema is lifted from

   "frame.h".  The parameter order is lifted from get_frame_memory,

   which in turn lifted it from read_memory.  */

extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,

                               gdb_byte *buf, LONGEST len);

extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,

                                            CORE_ADDR addr, int len);

/* If certain kinds of activity happen, target_wait should perform

   callbacks.  */

/* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible

   on TARGET_ACTIVITY_FD.  */

extern int target_activity_fd;

/* Returns zero to leave the inferior alone, one to interrupt it.  */

extern int (*target_activity_function) (void);

struct thread_info;             /* fwd decl for parameter list below: */

struct target_ops

  {

    struct target_ops *beneath; /* To the target under this one.  */

    char *to_shortname;         /* Name this target type */

    char *to_longname;          /* Name for printing */

    char *to_doc;               /* Documentation.  Does not include trailing

                                   newline, and starts with a one-line descrip-

                                   tion (probably similar to to_longname).  */

    /* Per-target scratch pad.  */

    void *to_data;

    /* The open routine takes the rest of the parameters from the

       command, and (if successful) pushes a new target onto the

       stack.  Targets should supply this routine, if only to provide

       an error message.  */

    void (*to_open) (char *, int);

    /* Old targets with a static target vector provide "to_close".

       New re-entrant targets provide "to_xclose" and that is expected

       to xfree everything (including the "struct target_ops").  */

    void (*to_xclose) (struct target_ops *targ, int quitting);

    void (*to_close) (int);

    void (*to_attach) (char *, int);

    void (*to_post_attach) (int);

    void (*to_detach) (char *, int);

    void (*to_disconnect) (struct target_ops *, char *, int);

    void (*to_resume) (ptid_t, int, enum target_signal);

    ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);

    void (*to_fetch_registers) (struct regcache *, int);

    void (*to_store_registers) (struct regcache *, int);

    void (*to_prepare_to_store) (struct regcache *);

    /* Transfer LEN bytes of memory between GDB address MYADDR and

       target address MEMADDR.  If WRITE, transfer them to the target, else

       transfer them from the target.  TARGET is the target from which we

       get this function.

       Return value, N, is one of the following:

       error which prevented us from doing it (FIXME: What about bfd_error?).

       positive (call it N) means that we have transferred N bytes

       starting at MEMADDR.  We might be able to handle more bytes

       beyond this length, but no promises.

       negative (call its absolute value N) means that we cannot

       transfer right at MEMADDR, but we could transfer at least

       something at MEMADDR + N.

       NOTE: cagney/2004-10-01: This has been entirely superseeded by

       to_xfer_partial and inferior inheritance.  */

    int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,

                                   int len, int write,

                                   struct mem_attrib *attrib,

                                   struct target_ops *target);

    void (*to_files_info) (struct target_ops *);

    int (*to_insert_breakpoint) (struct bp_target_info *);

    int (*to_remove_breakpoint) (struct bp_target_info *);

    int (*to_can_use_hw_breakpoint) (int, int, int);

    int (*to_insert_hw_breakpoint) (struct bp_target_info *);

    int (*to_remove_hw_breakpoint) (struct bp_target_info *);

    int (*to_remove_watchpoint) (CORE_ADDR, int, int);

    int (*to_insert_watchpoint) (CORE_ADDR, int, int);

    int (*to_stopped_by_watchpoint) (void);

    int to_have_steppable_watchpoint;

    int to_have_continuable_watchpoint;

    int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);

    int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);

    void (*to_terminal_init) (void);

    void (*to_terminal_inferior) (void);

    void (*to_terminal_ours_for_output) (void);

    void (*to_terminal_ours) (void);

    void (*to_terminal_save_ours) (void);

    void (*to_terminal_info) (char *, int);

    void (*to_kill) (void);

    void (*to_load) (char *, int);

    int (*to_lookup_symbol) (char *, CORE_ADDR *);

    void (*to_create_inferior) (char *, char *, char **, int);

    void (*to_post_startup_inferior) (ptid_t);

    void (*to_acknowledge_created_inferior) (int);

    void (*to_insert_fork_catchpoint) (int);

    int (*to_remove_fork_catchpoint) (int);

    void (*to_insert_vfork_catchpoint) (int);

    int (*to_remove_vfork_catchpoint) (int);

    int (*to_follow_fork) (struct target_ops *, int);

    void (*to_insert_exec_catchpoint) (int);

    int (*to_remove_exec_catchpoint) (int);

    int (*to_reported_exec_events_per_exec_call) (void);

    int (*to_has_exited) (int, int, int *);

    void (*to_mourn_inferior) (void);

    int (*to_can_run) (void);

    void (*to_notice_signals) (ptid_t ptid);

    int (*to_thread_alive) (ptid_t ptid);

    void (*to_find_new_threads) (void);

    char *(*to_pid_to_str) (ptid_t);

    char *(*to_extra_thread_info) (struct thread_info *);

    void (*to_stop) (void);

    void (*to_rcmd) (char *command, struct ui_file *output);

    char *(*to_pid_to_exec_file) (int pid);

    void (*to_log_command) (const char *);

    enum strata to_stratum;

    int to_has_all_memory;

    int to_has_memory;

    int to_has_stack;

    int to_has_registers;

    int to_has_execution;

    int to_has_thread_control;  /* control thread execution */

    struct section_table

     *to_sections;

    struct section_table

     *to_sections_end;

    /* ASYNC target controls */

    int (*to_can_async_p) (void);

    int (*to_is_async_p) (void);

    void (*to_async) (void (*cb) (enum inferior_event_type, void *context),

                      void *context);

    int to_async_mask_value;

    int (*to_find_memory_regions) (int (*) (CORE_ADDR,

                                            unsigned long,

                                            int, int, int,

                                            void *),

                                   void *);

    char * (*to_make_corefile_notes) (bfd *, int *);

    /* Return the thread-local address at OFFSET in the

       thread-local storage for the thread PTID and the shared library

       or executable file given by OBJFILE.  If that block of

       thread-local storage hasn't been allocated yet, this function

       may return an error.  */

    CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,

                                              CORE_ADDR load_module_addr,

                                              CORE_ADDR offset);

    /* Request that OPS transfer up to LEN 8-bit bytes of the target's

       OBJECT.  The OFFSET, for a seekable object, specifies the

       starting point.  The ANNEX can be used to provide additional

       data-specific information to the target.

       Return the number of bytes actually transfered, zero when no

       further transfer is possible, and -1 when the transfer is not

       supported.  Return of a positive value smaller than LEN does

       not indicate the end of the object, only the end of the

       transfer; higher level code should continue transferring if

       desired.  This is handled in target.c.

       The interface does not support a "retry" mechanism.  Instead it

       assumes that at least one byte will be transfered on each

       successful call.

       NOTE: cagney/2003-10-17: The current interface can lead to

       fragmented transfers.  Lower target levels should not implement

       hacks, such as enlarging the transfer, in an attempt to

       compensate for this.  Instead, the target stack should be

       extended so that it implements supply/collect methods and a

       look-aside object cache.  With that available, the lowest

       target can safely and freely "push" data up the stack.

       See target_read and target_write for more information.  One,

       and only one, of readbuf or writebuf must be non-NULL.  */

    LONGEST (*to_xfer_partial) (struct target_ops *ops,

                                enum target_object object, const char *annex,

                                gdb_byte *readbuf, const gdb_byte *writebuf,

                                ULONGEST offset, LONGEST len);

    /* Returns the memory map for the target.  A return value of NULL

       means that no memory map is available.  If a memory address

       does not fall within any returned regions, it's assumed to be

       RAM.  The returned memory regions should not overlap.

       The order of regions does not matter; target_memory_map will

       sort regions by starting address. For that reason, this

       function should not be called directly except via

       target_memory_map.

       This method should not cache data; if the memory map could

       change unexpectedly, it should be invalidated, and higher

       layers will re-fetch it.  */

    VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);

    /* Erases the region of flash memory starting at ADDRESS, of

       length LENGTH.

       Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned

       on flash block boundaries, as reported by 'to_memory_map'.  */

    void (*to_flash_erase) (struct target_ops *,

                           ULONGEST address, LONGEST length);

    /* Finishes a flash memory write sequence.  After this operation

       all flash memory should be available for writing and the result

       of reading from areas written by 'to_flash_write' should be

       equal to what was written.  */

    void (*to_flash_done) (struct target_ops *);

    /* Describe the architecture-specific features of this target.

       Returns the description found, or NULL if no description

       was available.  */

    const struct target_desc *(*to_read_description) (struct target_ops *ops);

    int to_magic;

    /* Need sub-structure for target machine related rather than comm related?

     */

  };

/* Magic number for checking ops size.  If a struct doesn't end with this

   number, somebody changed the declaration but didn't change all the

   places that initialize one.  */

#define OPS_MAGIC       3840

/* The ops structure for our "current" target process.  This should

   never be NULL.  If there is no target, it points to the dummy_target.  */

extern struct target_ops current_target;

/* Define easy words for doing these operations on our current target.  */

#define target_shortname        (current_target.to_shortname)

#define target_longname         (current_target.to_longname)

/* Does whatever cleanup is required for a target that we are no

   longer going to be calling.  QUITTING indicates that GDB is exiting

   and should not get hung on an error (otherwise it is important to

   perform clean termination, even if it takes a while).  This routine

   is automatically always called when popping the target off the

   target stack (to_beneath is undefined).  Closing file descriptors

   and freeing all memory allocated memory are typical things it

   should do.  */

void target_close (struct target_ops *targ, int quitting);

/* Attaches to a process on the target side.  Arguments are as passed

   to the `attach' command by the user.  This routine can be called

   when the target is not on the target-stack, if the target_can_run

   routine returns 1; in that case, it must push itself onto the stack.

   Upon exit, the target should be ready for normal operations, and

   should be ready to deliver the status of the process immediately

   (without waiting) to an upcoming target_wait call.  */

#define target_attach(args, from_tty)   \

     (*current_target.to_attach) (args, from_tty)

/* The target_attach operation places a process under debugger control,

   and stops the process.

   This operation provides a target-specific hook that allows the

   necessary bookkeeping to be performed after an attach completes.  */

#define target_post_attach(pid) \

     (*current_target.to_post_attach) (pid)

/* Takes a program previously attached to and detaches it.

   The program may resume execution (some targets do, some don't) and will

   no longer stop on signals, etc.  We better not have left any breakpoints

   in the program or it'll die when it hits one.  ARGS is arguments

   typed by the user (e.g. a signal to send the process).  FROM_TTY

   says whether to be verbose or not.  */

extern void target_detach (char *, int);

/* Disconnect from the current target without resuming it (leaving it

   waiting for a debugger).  */

extern void target_disconnect (char *, int);

/* Resume execution of the target process PTID.  STEP says whether to

   single-step or to run free; SIGGNAL is the signal to be given to

   the target, or TARGET_SIGNAL_0 for no signal.  The caller may not

   pass TARGET_SIGNAL_DEFAULT.  */

#define target_resume(ptid, step, siggnal)                              \

  do {                                                                  \

    dcache_invalidate(target_dcache);                                   \

    (*current_target.to_resume) (ptid, step, siggnal);                  \

  } while (0)

/* Wait for process pid to do something.  PTID = -1 to wait for any

   pid to do something.  Return pid of child, or -1 in case of error;

   store status through argument pointer STATUS.  Note that it is

   _NOT_ OK to throw_exception() out of target_wait() without popping

   the debugging target from the stack; GDB isn't prepared to get back

   to the prompt with a debugging target but without the frame cache,

   stop_pc, etc., set up.  */

#define target_wait(ptid, status)               \

     (*current_target.to_wait) (ptid, status)

/* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */

#define target_fetch_registers(regcache, regno) \

     (*current_target.to_fetch_registers) (regcache, regno)

/* Store at least register REGNO, or all regs if REGNO == -1.

   It can store as many registers as it wants to, so target_prepare_to_store

   must have been previously called.  Calls error() if there are problems.  */

#define target_store_registers(regcache, regs)  \

     (*current_target.to_store_registers) (regcache, regs)

/* Get ready to modify the registers array.  On machines which store

   individual registers, this doesn't need to do anything.  On machines

   which store all the registers in one fell swoop, this makes sure

   that REGISTERS contains all the registers from the program being

   debugged.  */

#define target_prepare_to_store(regcache)       \

     (*current_target.to_prepare_to_store) (regcache)

extern DCACHE *target_dcache;

extern int target_read_string (CORE_ADDR, char **, int, int *);

extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);

extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,

                                int len);

extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,

                        struct mem_attrib *, struct target_ops *);

/* Fetches the target's memory map.  If one is found it is sorted

   and returned, after some consistency checking.  Otherwise, NULL

   is returned.  */

VEC(mem_region_s) *target_memory_map (void);

/* Erase the specified flash region.  */

void target_flash_erase (ULONGEST address, LONGEST length);

/* Finish a sequence of flash operations.  */

void target_flash_done (void);

/* Describes a request for a memory write operation.  */

struct memory_write_request

  {

    /* Begining address that must be written. */

    ULONGEST begin;

    /* Past-the-end address. */

    ULONGEST end;

    /* The data to write. */

    gdb_byte *data;

    /* A callback baton for progress reporting for this request.  */

    void *baton;

  };

typedef struct memory_write_request memory_write_request_s;

DEF_VEC_O(memory_write_request_s);

/* Enumeration specifying different flash preservation behaviour.  */

enum flash_preserve_mode

  {

    flash_preserve,

    flash_discard

  };

/* Write several memory blocks at once.  This version can be more

   efficient than making several calls to target_write_memory, in

   particular because it can optimize accesses to flash memory.

   Moreover, this is currently the only memory access function in gdb

   that supports writing to flash memory, and it should be used for

   all cases where access to flash memory is desirable.

   REQUESTS is the vector (see vec.h) of memory_write_request.

   PRESERVE_FLASH_P indicates what to do with blocks which must be

     erased, but not completely rewritten.

   PROGRESS_CB is a function that will be periodically called to provide

     feedback to user.  It will be called with the baton corresponding

     to the request currently being written.  It may also be called

     with a NULL baton, when preserved flash sectors are being rewritten.

   The function returns 0 on success, and error otherwise.  */

int target_write_memory_blocks (VEC(memory_write_request_s) *requests,

                                enum flash_preserve_mode preserve_flash_p,

                                void (*progress_cb) (ULONGEST, void *));

/* From infrun.c.  */

extern int inferior_has_forked (int pid, int *child_pid);

extern int inferior_has_vforked (int pid, int *child_pid);

extern int inferior_has_execd (int pid, char **execd_pathname);

/* From exec.c */

extern void print_section_info (struct target_ops *, bfd *);

/* Print a line about the current target.  */

#define target_files_info()     \

     (*current_target.to_files_info) (&current_target)

/* Insert a breakpoint at address BP_TGT->placed_address in the target

   machine.  Result is 0 for success, or an errno value.  */

#define target_insert_breakpoint(bp_tgt)        \

     (*current_target.to_insert_breakpoint) (bp_tgt)

/* Remove a breakpoint at address BP_TGT->placed_address in the target

   machine.  Result is 0 for success, or an errno value.  */

#define target_remove_breakpoint(bp_tgt)        \

     (*current_target.to_remove_breakpoint) (bp_tgt)

/* Initialize the terminal settings we record for the inferior,

   before we actually run the inferior.  */

#define target_terminal_init() \

     (*current_target.to_terminal_init) ()

/* Put the inferior's terminal settings into effect.

   This is preparation for starting or resuming the inferior.  */

#define target_terminal_inferior() \

     (*current_target.to_terminal_inferior) ()

/* Put some of our terminal settings into effect,

   enough to get proper results from our output,

   but do not change into or out of RAW mode

   so that no input is discarded.

   After doing this, either terminal_ours or terminal_inferior

   should be called to get back to a normal state of affairs.  */

#define target_terminal_ours_for_output() \

     (*current_target.to_terminal_ours_for_output) ()

/* Put our terminal settings into effect.

   First record the inferior's terminal settings

   so they can be restored properly later.  */

#define target_terminal_ours() \

     (*current_target.to_terminal_ours) ()

/* Save our terminal settings.

   This is called from TUI after entering or leaving the curses

   mode.  Since curses modifies our terminal this call is here

   to take this change into account.  */

#define target_terminal_save_ours() \

     (*current_target.to_terminal_save_ours) ()

/* Print useful information about our terminal status, if such a thing