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- /* Interface between GDB and target environments, including files and processes
- Copyright 1990, 1991, 1992 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #if !defined (TARGET_H)
- #define TARGET_H
-
- /* 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"
-
- enum strata {
- dummy_stratum, /* The lowest of the low */
- file_stratum, /* Executable files, etc */
- core_stratum, /* Core dump files */
- process_stratum /* Executing processes */
- };
-
- struct target_ops
- {
- 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). */
- void (*to_open) PARAMS ((char *, int));
- void (*to_close) PARAMS ((int));
- void (*to_attach) PARAMS ((char *, int));
- void (*to_detach) PARAMS ((char *, int));
- void (*to_resume) PARAMS ((int, int));
- int (*to_wait) PARAMS ((int *));
- void (*to_fetch_registers) PARAMS ((int));
- void (*to_store_registers) PARAMS ((int));
- void (*to_prepare_to_store) PARAMS ((void));
- void (*to_convert_to_virtual) PARAMS ((int, char *, char *));
- void (*to_convert_from_virtual) PARAMS ((int, char *, char *));
- int (*to_xfer_memory) PARAMS ((CORE_ADDR, char *, int, int,
- struct target_ops *));
- void (*to_files_info) PARAMS ((struct target_ops *));
- int (*to_insert_breakpoint) PARAMS ((CORE_ADDR, char *));
- int (*to_remove_breakpoint) PARAMS ((CORE_ADDR, char *));
- void (*to_terminal_init) PARAMS ((void));
- void (*to_terminal_inferior) PARAMS ((void));
- void (*to_terminal_ours_for_output) PARAMS ((void));
- void (*to_terminal_ours) PARAMS ((void));
- void (*to_terminal_info) PARAMS ((char *, int));
- void (*to_kill) PARAMS ((void));
- void (*to_load) PARAMS ((char *, int));
- int (*to_lookup_symbol) PARAMS ((char *, CORE_ADDR *));
- void (*to_create_inferior) PARAMS ((char *, char *, char **));
- void (*to_mourn_inferior) PARAMS ((void));
- enum strata to_stratum;
- struct target_ops
- *to_next;
- int to_has_all_memory;
- int to_has_memory;
- int to_has_stack;
- int to_has_registers;
- int to_has_execution;
- struct section_table
- *to_sections;
- struct section_table
- *to_sections_end;
- 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. */
-
- 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)
-
- /* 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. */
- #define target_open(name, from_tty) \
- (*current_target->to_open) (name, from_tty)
-
- /* Does whatever cleanup is required for a target that we are no longer
- going to be calling. Argument says whether we are quitting gdb and
- should not get hung in case of errors, or whether we want a clean
- termination even if it takes a while. This routine is automatically
- always called just before a routine is popped off the target stack.
- Closing file descriptors and freeing memory are typical things it should
- do. */
-
- #define target_close(quitting) \
- (*current_target->to_close) (quitting)
-
- /* Attaches to a process on the target side. */
-
- #define target_attach(args, from_tty) \
- (*current_target->to_attach) (args, from_tty)
-
- /* 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. */
-
- #define target_detach(args, from_tty) \
- (*current_target->to_detach) (args, from_tty)
-
- /* Resume execution of the target process. STEP says whether to single-step
- or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given
- to the target, or zero for no signal. */
-
- #define target_resume(step, siggnal) \
- (*current_target->to_resume) (step, siggnal)
-
- /* Wait for inferior process to do something. Return pid of child,
- or -1 in case of error; store status through argument pointer STATUS. */
-
- #define target_wait(status) \
- (*current_target->to_wait) (status)
-
- /* Fetch register REGNO, or all regs if regno == -1. No result. */
-
- #define target_fetch_registers(regno) \
- (*current_target->to_fetch_registers) (regno)
-
- /* Store at least register REGNO, or all regs if REGNO == -1.
- It can store as many registers as it wants to, so the entire registers
- array must be valid. Result is 0 for success, -1 for problems. */
-
- #define target_store_registers(regs) \
- (*current_target->to_store_registers) (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() \
- (*current_target->to_prepare_to_store) ()
-
- /* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
- #define target_convert_to_virtual(regnum, from, to) \
- (*current_target->to_convert_to_virtual) (regnum, from, to)
-
- /* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
-
- #define target_convert_from_virtual(regnum, from, to) \
- (*current_target->to_convert_from_virtual) (regnum, from, to)
-
- /* Reading and writing memory actually happens through a glue
- function which iterates across the various targets. Result is
- 0 for success, or an errno value. */
-
- extern int
- target_read_string PARAMS ((CORE_ADDR, char *, int));
-
- extern int
- target_read_memory PARAMS ((CORE_ADDR, char *, int));
-
- extern int
- target_write_memory PARAMS ((CORE_ADDR, char *, int));
-
- extern int
- xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
-
- extern int
- child_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
-
- extern int
- target_xfer_memory PARAMS ((CORE_ADDR, char *, int, int));
-
- /* From exec.c */
-
- extern void
- print_section_info PARAMS ((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 ADDR in the target machine.
- SAVE is a pointer to memory allocated for saving the
- target contents. It is guaranteed by the caller to be long enough
- to save "sizeof BREAKPOINT" bytes. Result is 0 for success, or
- an errno value. */
-
- #define target_insert_breakpoint(addr, save) \
- (*current_target->to_insert_breakpoint) (addr, save)
-
- /* Remove a breakpoint at address ADDR in the target machine.
- SAVE is a pointer to the same save area
- that was previously passed to target_insert_breakpoint.
- Result is 0 for success, or an errno value. */
-
- #define target_remove_breakpoint(addr, save) \
- (*current_target->to_remove_breakpoint) (addr, save)
-
- /* 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) ()
-
- /* Print useful information about our terminal status, if such a thing
- exists. */
-
- #define target_terminal_info(arg, from_tty) \
- (*current_target->to_terminal_info) (arg, from_tty)
-
- /* Kill the inferior process. Make it go away. */
-
- #define target_kill() \
- (*current_target->to_kill) ()
-
- /* Load an executable file into the target process. This is expected to
- not only bring new code into the target process, but also to update
- GDB's symbol tables to match. */
-
- #define target_load(arg, from_tty) \
- (*current_target->to_load) (arg, from_tty)
-
- /* Look up a symbol in the target's symbol table. NAME is the symbol
- name. ADDRP is a CORE_ADDR * pointing to where the value of the symbol
- should be returned. The result is 0 if successful, nonzero if the
- symbol does not exist in the target environment. This function should
- not call error() if communication with the target is interrupted, since
- it is called from symbol reading, but should return nonzero, possibly
- doing a complain(). */
-
- #define target_lookup_symbol(name, addrp) \
- (*current_target->to_lookup_symbol) (name, addrp)
-
- /* Start an inferior process and set inferior_pid to its pid.
- EXEC_FILE is the file to run.
- ALLARGS is a string containing the arguments to the program.
- ENV is the environment vector to pass. Errors reported with error().
- On VxWorks and various standalone systems, we ignore exec_file. */
-
- #define target_create_inferior(exec_file, args, env) \
- (*current_target->to_create_inferior) (exec_file, args, env)
-
- /* The inferior process has died. Do what is right. */
-
- #define target_mourn_inferior() \
- (*current_target->to_mourn_inferior) ()
-
- /* Pointer to next target in the chain, e.g. a core file and an exec file. */
-
- #define target_next \
- (current_target->to_next)
-
- /* Does the target include all of memory, or only part of it? This
- determines whether we look up the target chain for other parts of
- memory if this target can't satisfy a request. */
-
- #define target_has_all_memory \
- (current_target->to_has_all_memory)
-
- /* Does the target include memory? (Dummy targets don't.) */
-
- #define target_has_memory \
- (current_target->to_has_memory)
-
- /* Does the target have a stack? (Exec files don't, VxWorks doesn't, until
- we start a process.) */
-
- #define target_has_stack \
- (current_target->to_has_stack)
-
- /* Does the target have registers? (Exec files don't.) */
-
- #define target_has_registers \
- (current_target->to_has_registers)
-
- /* Does the target have execution? Can we make it jump (through hoops),
- or pop its stack a few times? */
-
- #define target_has_execution \
- (current_target->to_has_execution)
-
- /* Routines for maintenance of the target structures...
-
- add_target: Add a target to the list of all possible targets.
-
- push_target: Make this target the top of the stack of currently used
- targets, within its particular stratum of the stack. Result
- is 0 if now atop the stack, nonzero if not on top (maybe
- should warn user).
-
- unpush_target: Remove this from the stack of currently used targets,
- no matter where it is on the list. Returns 0 if no
- change, 1 if removed from stack.
-
- pop_target: Remove the top thing on the stack of current targets. */
-
- extern void
- add_target PARAMS ((struct target_ops *));
-
- extern int
- push_target PARAMS ((struct target_ops *));
-
- extern int
- unpush_target PARAMS ((struct target_ops *));
-
- extern void
- target_preopen PARAMS ((int));
-
- extern void
- pop_target PARAMS ((void));
-
- /* Struct section_table maps address ranges to file sections. It is
- mostly used with BFD files, but can be used without (e.g. for handling
- raw disks, or files not in formats handled by BFD). */
-
- struct section_table {
- CORE_ADDR addr; /* Lowest address in section */
- CORE_ADDR endaddr; /* 1+highest address in section */
- sec_ptr sec_ptr; /* BFD section pointer */
- bfd *bfd; /* BFD file pointer */
- };
-
- /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
- Returns 0 if OK, 1 on error. */
-
- extern int
- build_section_table PARAMS ((bfd *, struct section_table **,
- struct section_table **));
-
- /* From inftarg.c */
-
- extern void
- host_convert_from_virtual PARAMS ((int, char *, char *));
-
- extern void
- host_convert_to_virtual PARAMS ((int, char *, char *));
-
- /* From mem-break.c */
-
- extern int
- memory_remove_breakpoint PARAMS ((CORE_ADDR, char *));
-
- extern int
- memory_insert_breakpoint PARAMS ((CORE_ADDR, char *));
-
- /* From target.c */
-
- void
- noprocess PARAMS ((void));
-
- #endif /* !defined (TARGET_H) */
-