sys/sys/exec.h

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)exec.h      8.3 (Berkeley) 1/21/94
  39  * $FreeBSD: src/sys/sys/exec.h,v 1.26 1999/12/29 04:24:40 peter Exp $
  40  * $DragonFly: src/sys/sys/exec.h,v 1.5 2006/12/23 00:27:03 swildner Exp $
  41  */
  42
  43 #ifndef _SYS_EXEC_H_
  44 #define _SYS_EXEC_H_
  45
  46 /*
  47  * The following structure is found at the top of the user stack of each
  48  * user process. The ps program uses it to locate argv and environment
  49  * strings. Programs that wish ps to display other information may modify
  50  * it; normally ps_argvstr points to the argv vector, and ps_nargvstr
  51  * is the same as the program's argc. The fields ps_envstr and ps_nenvstr
  52  * are the equivalent for the environment.
  53  */
  54 struct ps_strings {
  55         char    **ps_argvstr;   /* first of 0 or more argument strings */
  56         int     ps_nargvstr;    /* the number of argument strings */
  57         char    **ps_envstr;    /* first of 0 or more environment strings */
  58         int     ps_nenvstr;     /* the number of environment strings */
  59 };
  60
  61 /*
  62  * Address of ps_strings structure (in user space).
  63  */
  64 #define PS_STRINGS      (USRSTACK - sizeof(struct ps_strings))
  65 #define SPARE_USRSPACE  256
  66
  67 struct image_params;
  68
  69 struct execsw {
  70         int (*ex_imgact) (struct image_params *);
  71         const char *ex_name;
  72 };
  73
  74 #include <machine/exec.h>
  75
  76 #ifdef _KERNEL
  77 #include <sys/cdefs.h>
  78
  79 int exec_map_first_page (struct image_params *);
  80 void exec_unmap_first_page (struct image_params *);
  81
  82 int exec_register (const struct execsw *);
  83 int exec_unregister (const struct execsw *);
  84
  85 /*
  86  * note: name##_mod cannot be const storage because the
  87  * linker_file_sysinit() function modifies _file in the
  88  * moduledata_t.
  89  */
  90
  91 #include <sys/module.h>
  92
  93 #define DEFINE_EXEC_MODULE(name, execsw_arg) \
  94         static int name ## _modevent(module_t mod, int type, void *data) \
  95         { \
  96                 struct execsw *exec = (struct execsw *)data; \
  97                 int error = 0; \
  98                 switch (type) { \
  99                 case MOD_LOAD: \
 100                         /* kprintf(#name " module loaded\n"); */ \
 101                         error = exec_register(exec); \
 102                         if (error) \
 103                                 kprintf(#name "register failed\n"); \
 104                         break; \
 105                 case MOD_UNLOAD: \
 106                         /* kprintf(#name " module unloaded\n"); */ \
 107                         error = exec_unregister(exec); \
 108                         if (error) \
 109                                 kprintf(#name " unregister failed\n"); \
 110                         break; \
 111                 default: \
 112                         break; \
 113                 } \
 114                 return error; \
 115         } \
 116         static moduledata_t name ## _mod = { \
 117                 #name, \
 118                 name ## _modevent, \
 119                 (void *)& execsw_arg \
 120         };
 121
 122 #define EXEC_SET_ORDERED(name, execsw_arg, order)                       \
 123         DEFINE_EXEC_MODULE(name, execsw_arg)                            \
 124         DECLARE_MODULE(name, name ## _mod, SI_SUB_EXEC, order)
 125
 126 #define EXEC_SET(name, execsw_arg)                                      \
 127         EXEC_SET_ORDERED(name, execsw_arg, SI_ORDER_ANY)
 128
 129 #endif
 130
 131 #endif