mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
271 lines
9.2 KiB
C
271 lines
9.2 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
|
|||
|
|
|
|||
|
|
/* Forward decl for stat/fstat. */
|
|||
|
|
struct stat;
|
|||
|
|
|
|||
|
|
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 *));
|
|||
|
|
int (*stat) PARAMS ((host_callback *, const char *, struct stat *));
|
|||
|
|
int (*fstat) PARAMS ((host_callback *, int, struct stat *));
|
|||
|
|
|
|||
|
|
/* 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.
|
|||
|
|
??? One can certainly start a discussion over the ones that are currently
|
|||
|
|
here, but that will always be true. */
|
|||
|
|
|
|||
|
|
/* These are used by the ANSI C support of libc. */
|
|||
|
|
#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 14
|
|||
|
|
#define CB_SYS_stat 15
|
|||
|
|
#define CB_SYS_chmod 16
|
|||
|
|
#define CB_SYS_utime 17
|
|||
|
|
#define CB_SYS_time 18
|
|||
|
|
|
|||
|
|
/* 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. */
|
|||
|
|
PTR p1;
|
|||
|
|
PTR p2;
|
|||
|
|
long x1,x2;
|
|||
|
|
|
|||
|
|
/* Callbacks for reading/writing memory (e.g. for read/write syscalls).
|
|||
|
|
??? long or unsigned long might be better to use for the `count'
|
|||
|
|
argument here. We mimic sim_{read,write} for now. Be careful to
|
|||
|
|
test any changes with -Wall -Werror, mixed signed comparisons
|
|||
|
|
will get you. */
|
|||
|
|
int (*read_mem) PARAMS ((host_callback * /*cb*/, struct cb_syscall * /*sc*/,
|
|||
|
|
unsigned long /*taddr*/, char * /*buf*/,
|
|||
|
|
int /*bytes*/));
|
|||
|
|
int (*write_mem) PARAMS ((host_callback * /*cb*/, struct cb_syscall * /*sc*/,
|
|||
|
|
unsigned long /*taddr*/, const char * /*buf*/,
|
|||
|
|
int /*bytes*/));
|
|||
|
|
|
|||
|
|
/* For sanity checking, should be last entry. */
|
|||
|
|
int magic;
|
|||
|
|
} CB_SYSCALL;
|
|||
|
|
|
|||
|
|
/* Magic number sanity checker. */
|
|||
|
|
#define CB_SYSCALL_MAGIC 0x12344321
|
|||
|
|
|
|||
|
|
/* Macro to initialize CB_SYSCALL. Called first, before filling in
|
|||
|
|
any fields. */
|
|||
|
|
#define CB_SYSCALL_INIT(sc) \
|
|||
|
|
do { \
|
|||
|
|
memset ((sc), 0, sizeof (*(sc))); \
|
|||
|
|
(sc)->magic = CB_SYSCALL_MAGIC; \
|
|||
|
|
} while (0)
|
|||
|
|
|
|||
|
|
/* 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.
|
|||
|
|
If stat struct ptr is NULL, just compute target stat struct size.
|
|||
|
|
Result is size of target stat struct or 0 if error. */
|
|||
|
|
int cb_host_to_target_stat PARAMS ((host_callback *, const struct stat *, PTR));
|
|||
|
|
|
|||
|
|
/* Perform a system call. */
|
|||
|
|
CB_RC cb_syscall PARAMS ((host_callback *, CB_SYSCALL *));
|
|||
|
|
|
|||
|
|
#endif
|