| 1 | /* Remote target system call callback support.
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| 2 | Copyright 1997 Free Software Foundation, Inc.
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| 3 | Contributed by Cygnus Solutions.
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| 4 |
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| 5 | This file is part of GDB.
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program; if not, write to the Free Software
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| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 20 |
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| 21 | /* This interface isn't intended to be specific to any particular kind
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| 22 | of remote (hardware, simulator, whatever). As such, support for it
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| 23 | (e.g. sim/common/callback.c) should *not* live in the simulator source
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| 24 | tree, nor should it live in the gdb source tree. */
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| 25 |
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| 26 | /* There are various ways to handle system calls:
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| 27 |
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| 28 | 1) Have a simulator intercept the appropriate trap instruction and
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| 29 | directly perform the system call on behalf of the target program.
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| 30 | This is the typical way of handling system calls for embedded targets.
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| 31 | [Handling system calls for embedded targets isn't that much of an
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| 32 | oxymoron as running compiler testsuites make use of the capability.]
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| 33 |
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| 34 | This method of system call handling is done when STATE_ENVIRONMENT
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| 35 | is ENVIRONMENT_USER.
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| 36 |
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| 37 | 2) Have a simulator emulate the hardware as much as possible.
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| 38 | If the program running on the real hardware communicates with some sort
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| 39 | of target manager, one would want to be able to run this program on the
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| 40 | simulator as well.
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| 41 |
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| 42 | This method of system call handling is done when STATE_ENVIRONMENT
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| 43 | is ENVIRONMENT_OPERATING.
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| 44 | */
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| 45 |
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| 46 | #ifndef CALLBACK_H
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| 47 | #define CALLBACK_H
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| 48 |
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| 49 | /* ??? The reason why we check for va_start here should be documented. */
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| 50 |
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| 51 | #ifndef va_start
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| 52 | #include <ansidecl.h>
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| 53 | #ifdef ANSI_PROTOTYPES
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| 54 | #include <stdarg.h>
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| 55 | #else
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| 56 | #include <varargs.h>
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| 57 | #endif
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| 58 | #endif
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| 59 | |
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| 60 |
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| 61 | /* Mapping of host/target values. */
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| 62 | /* ??? For debugging purposes, one might want to add a string of the
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| 63 | name of the symbol. */
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| 64 |
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| 65 | typedef struct {
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| 66 | int host_val;
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| 67 | int target_val;
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