8d5306e718
(host_callback): Add stat, fstat, syscall_map, errno_map, open_map,
signal_map, stat_map.
(errn_map,open_map): Renamed to cb_init_foo_map.
(cb_host_to_target_errno,cb_target_to_host_open): Renamed from
host_to_target_errno,target_to_host_open.
(cb_read_target_syscall_maps): Add prototype.
(cb_target_to_host_syscall): Likewise.
(cb_host_to_target_stat): Likewise.
(cb_syscall): Likewise.
(CB_SYS_{exit,open,close,read,write,lseek,unlink,getpid,kill,fstat,
argvlen,argv,chdir,stat,chmod,utime,time}): Define.
(CB_SYSCALL): New type.
(CB_RC): New enum.
241 lines
8.4 KiB
C
241 lines
8.4 KiB
C
/* Remote target system call callback support.
|
||
Copyright 1997 Free Software Foundation, Inc.
|
||
Contributed by Cygnus Solutions.
|
||
|
||
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. */
|
||
|
||
/* This interface isn't intended to be specific to any particular kind
|
||
of remote (hardware, simulator, whatever). As such, support for it
|
||
(e.g. sim/common/callback.c) should *not* live in the simulator source
|
||
tree, nor should it live in the gdb source tree. */
|
||
|
||
/* There are various ways to handle system calls:
|
||
|
||
1) Have a simulator intercept the appropriate trap instruction and
|
||
directly perform the system call on behalf of the target program.
|
||
This is the typical way of handling system calls for embedded targets.
|
||
[Handling system calls for embedded targets isn't that much of an
|
||
oxymoron as running compiler testsuites make use of the capability.]
|
||
|
||
This method of system call handling is done when STATE_ENVIRONMENT
|
||
is ENVIRONMENT_USER.
|
||
|
||
2) Have a simulator emulate the hardware as much as possible.
|
||
If the program running on the real hardware communicates with some sort
|
||
of target manager, one would want to be able to run this program on the
|
||
simulator as well.
|
||
|
||
This method of system call handling is done when STATE_ENVIRONMENT
|
||
is ENVIRONMENT_OPERATING.
|
||
*/
|
||
|
||
#ifndef CALLBACK_H
|
||
#define CALLBACK_H
|
||
|
||
/* ??? The reason why we check for va_start here should be documented. */
|
||
|
||
#ifndef va_start
|
||
#include <ansidecl.h>
|
||
#ifdef ANSI_PROTOTYPES
|
||
#include <stdarg.h>
|
||
#else
|
||
#include <varargs.h>
|
||
#endif
|
||
#endif
|
||
|
||
/* Mapping of host/target values. */
|
||
/* ??? For debugging purposes, one might want to add a string of the
|
||
name of the symbol. */
|
||
|
||
typedef struct {
|
||
int host_val;
|
||
int target_val;
|
||
} CB_TARGET_DEFS_MAP;
|
||
|
||
#define MAX_CALLBACK_FDS 10
|
||
|
||
typedef struct host_callback_struct host_callback;
|
||
|
||
struct host_callback_struct
|
||
{
|
||
int (*close) PARAMS ((host_callback *,int));
|
||
int (*get_errno) PARAMS ((host_callback *));
|
||
int (*isatty) PARAMS ((host_callback *, int));
|
||
int (*lseek) PARAMS ((host_callback *, int, long , int));
|
||
int (*open) PARAMS ((host_callback *, const char*, int mode));
|
||
int (*read) PARAMS ((host_callback *,int, char *, int));
|
||
int (*read_stdin) PARAMS (( host_callback *, char *, int));
|
||
int (*rename) PARAMS ((host_callback *, const char *, const char *));
|
||
int (*system) PARAMS ((host_callback *, const char *));
|
||
long (*time) PARAMS ((host_callback *, long *));
|
||
int (*unlink) PARAMS ((host_callback *, const char *));
|
||
int (*write) PARAMS ((host_callback *,int, const char *, int));
|
||
int (*write_stdout) PARAMS ((host_callback *, const char *, int));
|
||
void (*flush_stdout) PARAMS ((host_callback *));
|
||
int (*write_stderr) PARAMS ((host_callback *, const char *, int));
|
||
void (*flush_stderr) PARAMS ((host_callback *));
|
||
/* PTR is not `struct stat' because the target's value is stored. */
|
||
int (*stat) PARAMS ((host_callback *, const char *, PTR));
|
||
int (*fstat) PARAMS ((host_callback *, int, PTR));
|
||
|
||
/* When present, call to the client to give it the oportunity to
|
||
poll any io devices for a request to quit (indicated by a nonzero
|
||
return value). */
|
||
int (*poll_quit) PARAMS ((host_callback *));
|
||
|
||
/* Used when the target has gone away, so we can close open
|
||
handles and free memory etc etc. */
|
||
int (*shutdown) PARAMS ((host_callback *));
|
||
int (*init) PARAMS ((host_callback *));
|
||
|
||
/* depreciated, use vprintf_filtered - Talk to the user on a console. */
|
||
void (*printf_filtered) PARAMS ((host_callback *, const char *, ...));
|
||
|
||
/* Talk to the user on a console. */
|
||
void (*vprintf_filtered) PARAMS ((host_callback *, const char *, va_list));
|
||
|
||
/* Same as vprintf_filtered but to stderr. */
|
||
void (*evprintf_filtered) PARAMS ((host_callback *, const char *, va_list));
|
||
|
||
/* Print an error message and "exit".
|
||
In the case of gdb "exiting" means doing a longjmp back to the main
|
||
command loop. */
|
||
void (*error) PARAMS ((host_callback *, const char *, ...));
|
||
|
||
int last_errno; /* host format */
|
||
|
||
int fdmap[MAX_CALLBACK_FDS];
|
||
char fdopen[MAX_CALLBACK_FDS];
|
||
char alwaysopen[MAX_CALLBACK_FDS];
|
||
|
||
/* System call numbers. */
|
||
CB_TARGET_DEFS_MAP *syscall_map;
|
||
/* Errno values. */
|
||
CB_TARGET_DEFS_MAP *errno_map;
|
||
/* Flags to the open system call. */
|
||
CB_TARGET_DEFS_MAP *open_map;
|
||
/* Signal numbers. */
|
||
CB_TARGET_DEFS_MAP *signal_map;
|
||
/* Layout of `stat' struct.
|
||
The format is a series of "name,length" pairs separated by colons.
|
||
Empty space is indicated with a `name' of "space".
|
||
All padding must be explicitly mentioned.
|
||
Lengths are in bytes. If this needs to be extended to bits,
|
||
use "name.bits".
|
||
Example: "st_dev,4:st_ino,4:st_mode,4:..." */
|
||
const char *stat_map;
|
||
|
||
/* Marker for those wanting to do sanity checks.
|
||
This should remain the last member of this struct to help catch
|
||
miscompilation errors. */
|
||
#define HOST_CALLBACK_MAGIC 4705 /* teds constant */
|
||
int magic;
|
||
};
|
||
|
||
extern host_callback default_callback;
|
||
|
||
/* Canonical versions of system call numbers.
|
||
It's not intended to willy-nilly throw every system call ever heard
|
||
of in here. Only include those that have an important use. */
|
||
|
||
#define CB_SYS_exit 1
|
||
#define CB_SYS_open 2
|
||
#define CB_SYS_close 3
|
||
#define CB_SYS_read 4
|
||
#define CB_SYS_write 5
|
||
#define CB_SYS_lseek 6
|
||
#define CB_SYS_unlink 7
|
||
#define CB_SYS_getpid 8
|
||
#define CB_SYS_kill 9
|
||
#define CB_SYS_fstat 10
|
||
/*#define CB_SYS_sbrk 11 - not currently a system call, but reserved. */
|
||
|
||
/* ARGV support. */
|
||
#define CB_SYS_argvlen 12
|
||
#define CB_SYS_argv 13
|
||
|
||
/* These are extras added for one reason or another. */
|
||
#define CB_SYS_chdir 20
|
||
#define CB_SYS_stat 21
|
||
#define CB_SYS_chmod 22
|
||
#define CB_SYS_utime 23
|
||
#define CB_SYS_time 24
|
||
|
||
/* Struct use to pass and return information necessary to perform a
|
||
system call. */
|
||
/* FIXME: Need to consider target word size. */
|
||
|
||
typedef struct cb_syscall {
|
||
/* The target's value of what system call to perform. */
|
||
int func;
|
||
/* The arguments to the syscall. */
|
||
long arg1, arg2, arg3, arg4;
|
||
|
||
/* The result. */
|
||
long result;
|
||
/* Some system calls have two results. */
|
||
long result2;
|
||
/* The target's errno value, or 0 if success.
|
||
This is converted to the target's value with host_to_target_errno. */
|
||
int errcode;
|
||
|
||
/* Working space to be used by memory read/write callbacks. */
|
||
long x1,x2;
|
||
|
||
/* Callbacks for reading/writing memory (e.g. for read/write syscalls). */
|
||
unsigned long (*read_mem) PARAMS ((host_callback *, struct cb_syscall *, unsigned long taddr, char *buf, unsigned long bytes));
|
||
unsigned long (*write_mem) PARAMS ((host_callback *, struct cb_syscall *, unsigned long taddr, const char *buf, unsigned long bytes));
|
||
} CB_SYSCALL;
|
||
|
||
/* Return codes for various interface routines. */
|
||
|
||
typedef enum {
|
||
CB_RC_OK = 0,
|
||
/* generic error */
|
||
CB_RC_ERR,
|
||
/* either file not found or no read access */
|
||
CB_RC_ACCESS,
|
||
CB_RC_NO_MEM
|
||
} CB_RC;
|
||
|
||
/* Read in target values for system call numbers, errno values, signals. */
|
||
CB_RC cb_read_target_syscall_maps PARAMS ((host_callback *, const char *));
|
||
|
||
/* Translate target to host syscall function numbers. */
|
||
int cb_target_to_host_syscall PARAMS ((host_callback *, int));
|
||
|
||
/* Translate host to target errno value. */
|
||
int cb_host_to_target_errno PARAMS ((host_callback *, int));
|
||
|
||
/* Translate target to host open flags. */
|
||
int cb_target_to_host_open PARAMS ((host_callback *, int));
|
||
|
||
/* Translate target signal number to host. */
|
||
int cb_target_to_host_signal PARAMS ((host_callback *, int));
|
||
|
||
/* Translate host signal number to target. */
|
||
int cb_host_to_target_signal PARAMS ((host_callback *, int));
|
||
|
||
/* Translate host stat struct to target. */
|
||
struct stat; /* forward decl */
|
||
int cb_host_to_target_stat PARAMS ((host_callback *, const struct stat *,
|
||
PTR, int));
|
||
|
||
/* Perform a system call. */
|
||
CB_RC cb_syscall PARAMS ((host_callback *, CB_SYSCALL *));
|
||
|
||
#endif
|