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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [include/] [gdb/] [callback.h] - Blame information for rev 225

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1 24 jeremybenn
/* Remote target system call callback support.
2 225 jeremybenn
   Copyright 1997, 2007, 2008, 2009 Free Software Foundation, Inc.
3 24 jeremybenn
   Contributed by Cygnus Solutions.
4
 
5
   This file is part of GDB.
6
 
7
   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
 
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/* This interface isn't intended to be specific to any particular kind
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   of remote (hardware, simulator, whatever).  As such, support for it
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   (e.g. sim/common/callback.c) should *not* live in the simulator source
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   tree, nor should it live in the gdb source tree.  */
24
 
25
/* There are various ways to handle system calls:
26
 
27
   1) Have a simulator intercept the appropriate trap instruction and
28
   directly perform the system call on behalf of the target program.
29
   This is the typical way of handling system calls for embedded targets.
30
   [Handling system calls for embedded targets isn't that much of an
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   oxymoron as running compiler testsuites make use of the capability.]
32
 
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   This method of system call handling is done when STATE_ENVIRONMENT
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   is ENVIRONMENT_USER.
35
 
36
   2) Have a simulator emulate the hardware as much as possible.
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   If the program running on the real hardware communicates with some sort
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   of target manager, one would want to be able to run this program on the
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   simulator as well.
40
 
41
   This method of system call handling is done when STATE_ENVIRONMENT
42
   is ENVIRONMENT_OPERATING.
43
*/
44
 
45
#ifndef CALLBACK_H
46
#define CALLBACK_H
47
 
48
/* ??? The reason why we check for va_start here should be documented.  */
49
 
50
#ifndef va_start
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#include <ansidecl.h>
52
#include <stdarg.h>
53
#endif
54
/* Needed for enum bfd_endian.  */
55
#include "bfd.h"
56
 
57
/* Mapping of host/target values.  */
58
/* ??? For debugging purposes, one might want to add a string of the
59
   name of the symbol.  */
60
 
61
typedef struct {
62
  int host_val;
63
  int target_val;
64
} CB_TARGET_DEFS_MAP;
65
 
66
#define MAX_CALLBACK_FDS 10
67
 
68
/* Forward decl for stat/fstat.  */
69
struct stat;
70
 
71
typedef struct host_callback_struct host_callback;
72
 
73
struct host_callback_struct
74
{
75
  int (*close) PARAMS ((host_callback *,int));
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  int (*get_errno) PARAMS ((host_callback *));
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  int (*isatty) PARAMS ((host_callback *, int));
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  int (*lseek) PARAMS ((host_callback *, int, long , int));
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  int (*open) PARAMS ((host_callback *, const char*, int mode));
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  int (*read) PARAMS ((host_callback *,int,  char *, int));
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  int (*read_stdin) PARAMS (( host_callback *, char *, int));
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  int (*rename) PARAMS ((host_callback *, const char *, const char *));
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  int (*system) PARAMS ((host_callback *, const char *));
84
  long (*time) PARAMS ((host_callback *, long *));
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  int (*unlink) PARAMS ((host_callback *, const char *));
86
  int (*write) PARAMS ((host_callback *,int, const char *, int));
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  int (*write_stdout) PARAMS ((host_callback *, const char *, int));
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  void (*flush_stdout) PARAMS ((host_callback *));
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  int (*write_stderr) PARAMS ((host_callback *, const char *, int));
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  void (*flush_stderr) PARAMS ((host_callback *));
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  int (*stat) PARAMS ((host_callback *, const char *, struct stat *));
92
  int (*fstat) PARAMS ((host_callback *, int, struct stat *));
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  int (*lstat) PARAMS ((host_callback *, const char *, struct stat *));
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  int (*ftruncate) PARAMS ((host_callback *, int, long));
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  int (*truncate) PARAMS ((host_callback *, const char *, long));
96
  int (*pipe) PARAMS ((host_callback *, int *));
97
 
98
  /* Called by the framework when a read call has emptied a pipe buffer.  */
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  void (*pipe_empty) PARAMS ((host_callback *, int read_fd, int write_fd));
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101
  /* Called by the framework when a write call makes a pipe buffer
102
     non-empty.  */
103
  void (*pipe_nonempty) PARAMS ((host_callback *, int read_fd, int write_fd));
104
 
105
  /* When present, call to the client to give it the oportunity to
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     poll any io devices for a request to quit (indicated by a nonzero
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     return value). */
108
  int (*poll_quit) PARAMS ((host_callback *));
109
 
110
  /* Used when the target has gone away, so we can close open
111
     handles and free memory etc etc.  */
112
  int (*shutdown) PARAMS ((host_callback *));
113
  int (*init)     PARAMS ((host_callback *));
114
 
115
  /* depreciated, use vprintf_filtered - Talk to the user on a console.  */
116
  void (*printf_filtered) PARAMS ((host_callback *, const char *, ...));
117
 
118
  /* Talk to the user on a console.  */
119
  void (*vprintf_filtered) PARAMS ((host_callback *, const char *, va_list));
120
 
121
  /* Same as vprintf_filtered but to stderr.  */
122
  void (*evprintf_filtered) PARAMS ((host_callback *, const char *, va_list));
123
 
124
  /* Print an error message and "exit".
125
     In the case of gdb "exiting" means doing a longjmp back to the main
126
     command loop.  */
127 225 jeremybenn
  void (*error) PARAMS ((host_callback *, const char *, ...))
128
#ifdef __GNUC__
129
    __attribute__ ((__noreturn__))
130
#endif
131
    ;
132 24 jeremybenn
 
133
  int last_errno;               /* host format */
134
 
135
  int fdmap[MAX_CALLBACK_FDS];
136
  /* fd_buddy is used to contruct circular lists of target fds that point to
137
     the same host fd.  A uniquely mapped fd points to itself; for a closed
138
     one, fd_buddy has the value -1.  The host file descriptors for stdin /
139
     stdout / stderr are never closed by the simulators, so they are put
140
     in a special fd_buddy circular list which also has MAX_CALLBACK_FDS
141
     as a member.  */
142
  /* ??? We don't have a callback entry for dup, although it is trival to
143
     implement now.  */
144
  short fd_buddy[MAX_CALLBACK_FDS+1];
145
 
146
  /* 0 = none, >0 = reader (index of writer),
147
     <0 = writer (negative index of reader).
148
     If abs (ispipe[N]) == N, then N is an end of a pipe whose other
149
     end is closed.  */
150
  short ispipe[MAX_CALLBACK_FDS];
151
 
152
  /* A writer stores the buffer at its index.  Consecutive writes
153
     realloc the buffer and add to the size.  The reader indicates the
154
     read part in its .size, until it has consumed it all, at which
155
     point it deallocates the buffer and zeroes out both sizes.  */
156
  struct pipe_write_buffer
157
  {
158
    int size;
159
    char *buffer;
160
  } pipe_buffer[MAX_CALLBACK_FDS];
161
 
162
  /* System call numbers.  */
163
  CB_TARGET_DEFS_MAP *syscall_map;
164
  /* Errno values.  */
165
  CB_TARGET_DEFS_MAP *errno_map;
166
  /* Flags to the open system call.  */
167
  CB_TARGET_DEFS_MAP *open_map;
168
  /* Signal numbers.  */
169
  CB_TARGET_DEFS_MAP *signal_map;
170
  /* Layout of `stat' struct.
171
     The format is a series of "name,length" pairs separated by colons.
172
     Empty space is indicated with a `name' of "space".
173
     All padding must be explicitly mentioned.
174
     Lengths are in bytes.  If this needs to be extended to bits,
175
     use "name.bits".
176
     Example: "st_dev,4:st_ino,4:st_mode,4:..."  */
177
  const char *stat_map;
178
 
179
  enum bfd_endian target_endian;
180
 
181
  /* Size of an "int" on the target (for syscalls whose ABI uses "int").
182
     This must include padding, and only padding-at-higher-address is
183
     supported.  For example, a 64-bit target with 32-bit int:s which
184
     are padded to 64 bits when in an array, should supposedly set this
185
     to 8.  The default is 4 which matches ILP32 targets and 64-bit
186
     targets with 32-bit ints and no padding.  */
187
  int target_sizeof_int;
188
 
189
  /* Marker for those wanting to do sanity checks.
190
     This should remain the last member of this struct to help catch
191
     miscompilation errors. */
192
#define HOST_CALLBACK_MAGIC 4705 /* teds constant */
193
  int magic;
194
};
195
 
196
extern host_callback default_callback;
197
 
198
/* Canonical versions of system call numbers.
199
   It's not intended to willy-nilly throw every system call ever heard
200
   of in here.  Only include those that have an important use.
201
   ??? One can certainly start a discussion over the ones that are currently
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   here, but that will always be true.  */
203
 
204
/* These are used by the ANSI C support of libc.  */
205
#define CB_SYS_exit     1
206
#define CB_SYS_open     2
207
#define CB_SYS_close    3
208
#define CB_SYS_read     4
209
#define CB_SYS_write    5
210
#define CB_SYS_lseek    6
211
#define CB_SYS_unlink   7
212
#define CB_SYS_getpid   8
213
#define CB_SYS_kill     9
214
#define CB_SYS_fstat    10
215
/*#define CB_SYS_sbrk   11 - not currently a system call, but reserved.  */
216
 
217
/* ARGV support.  */
218
#define CB_SYS_argvlen  12
219
#define CB_SYS_argv     13
220
 
221
/* These are extras added for one reason or another.  */
222
#define CB_SYS_chdir    14
223
#define CB_SYS_stat     15
224
#define CB_SYS_chmod    16
225
#define CB_SYS_utime    17
226
#define CB_SYS_time     18
227
 
228
/* More standard syscalls.  */
229
#define CB_SYS_lstat    19
230
#define CB_SYS_rename   20
231
#define CB_SYS_truncate 21
232
#define CB_SYS_ftruncate 22
233
#define CB_SYS_pipe     23
234
 
235
/* Struct use to pass and return information necessary to perform a
236
   system call.  */
237
/* FIXME: Need to consider target word size.  */
238
 
239
typedef struct cb_syscall {
240
  /* The target's value of what system call to perform.  */
241
  int func;
242
  /* The arguments to the syscall.  */
243
  long arg1, arg2, arg3, arg4;
244
 
245
  /* The result.  */
246
  long result;
247
  /* Some system calls have two results.  */
248
  long result2;
249
  /* The target's errno value, or 0 if success.
250
     This is converted to the target's value with host_to_target_errno.  */
251
  int errcode;
252
 
253
  /* Working space to be used by memory read/write callbacks.  */
254
  PTR p1;
255
  PTR p2;
256
  long x1,x2;
257
 
258
  /* Callbacks for reading/writing memory (e.g. for read/write syscalls).
259
     ??? long or unsigned long might be better to use for the `count'
260
     argument here.  We mimic sim_{read,write} for now.  Be careful to
261
     test any changes with -Wall -Werror, mixed signed comparisons
262
     will get you.  */
263
  int (*read_mem) PARAMS ((host_callback * /*cb*/, struct cb_syscall * /*sc*/,
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                           unsigned long /*taddr*/, char * /*buf*/,
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                           int /*bytes*/));
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  int (*write_mem) PARAMS ((host_callback * /*cb*/, struct cb_syscall * /*sc*/,
267
                            unsigned long /*taddr*/, const char * /*buf*/,
268
                            int /*bytes*/));
269
 
270
  /* For sanity checking, should be last entry.  */
271
  int magic;
272
} CB_SYSCALL;
273
 
274
/* Magic number sanity checker.  */
275
#define CB_SYSCALL_MAGIC 0x12344321
276
 
277
/* Macro to initialize CB_SYSCALL.  Called first, before filling in
278
   any fields.  */
279
#define CB_SYSCALL_INIT(sc) \
280
do { \
281
  memset ((sc), 0, sizeof (*(sc))); \
282
  (sc)->magic = CB_SYSCALL_MAGIC; \
283
} while (0)
284
 
285
/* Return codes for various interface routines.  */
286
 
287
typedef enum {
288
  CB_RC_OK = 0,
289
  /* generic error */
290
  CB_RC_ERR,
291
  /* either file not found or no read access */
292
  CB_RC_ACCESS,
293
  CB_RC_NO_MEM
294
} CB_RC;
295
 
296
/* Read in target values for system call numbers, errno values, signals.  */
297
CB_RC cb_read_target_syscall_maps PARAMS ((host_callback *, const char *));
298
 
299
/* Translate target to host syscall function numbers.  */
300
int cb_target_to_host_syscall PARAMS ((host_callback *, int));
301
 
302
/* Translate host to target errno value.  */
303
int cb_host_to_target_errno PARAMS ((host_callback *, int));
304
 
305
/* Translate target to host open flags.  */
306
int cb_target_to_host_open PARAMS ((host_callback *, int));
307
 
308
/* Translate target signal number to host.  */
309
int cb_target_to_host_signal PARAMS ((host_callback *, int));
310
 
311
/* Translate host signal number to target.  */
312
int cb_host_to_target_signal PARAMS ((host_callback *, int));
313
 
314
/* Translate host stat struct to target.
315
   If stat struct ptr is NULL, just compute target stat struct size.
316
   Result is size of target stat struct or 0 if error.  */
317
int cb_host_to_target_stat PARAMS ((host_callback *, const struct stat *, PTR));
318
 
319
/* Translate a value to target endian.  */
320
void cb_store_target_endian PARAMS ((host_callback *, char *, int, long));
321
 
322
/* Tests for special fds.  */
323
int cb_is_stdin PARAMS ((host_callback *, int));
324
int cb_is_stdout PARAMS ((host_callback *, int));
325
int cb_is_stderr PARAMS ((host_callback *, int));
326
 
327
/* Perform a system call.  */
328
CB_RC cb_syscall PARAMS ((host_callback *, CB_SYSCALL *));
329
 
330
#endif

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