1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef _SYS_EXEC_H_ 38 #define _SYS_EXEC_H_ 39 40 /* 41 * Before ps_args existed, the following structure, found at the top of 42 * the user stack of each user process, was used by ps(1) to locate 43 * environment and argv strings. Normally ps_argvstr points to the 44 * argv vector, and ps_nargvstr is the same as the program's argc. The 45 * fields ps_envstr and ps_nenvstr are the equivalent for the environment. 46 * 47 * Programs should now use setproctitle(3) to change ps output. 48 * setproctitle() always informs the kernel with sysctl and sets the 49 * pointers in ps_strings. The kern.proc.args sysctl first tries p_args. 50 * If p_args is NULL, it then falls back to reading ps_strings and following 51 * the pointers. 52 */ 53 struct ps_strings { 54 char **ps_argvstr; /* first of 0 or more argument strings */ 55 unsigned int ps_nargvstr; /* the number of argument strings */ 56 char **ps_envstr; /* first of 0 or more environment strings */ 57 unsigned int ps_nenvstr; /* the number of environment strings */ 58 }; 59 60 struct image_params; 61 62 struct execsw { 63 int (*ex_imgact)(struct image_params *); 64 const char *ex_name; 65 }; 66 67 #include <machine/exec.h> 68 69 #ifdef _KERNEL 70 #include <sys/cdefs.h> 71 72 /* 73 * Address of ps_strings structure (in user space). 74 * Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant. 75 */ 76 #define PS_STRINGS (USRSTACK - sizeof(struct ps_strings)) 77 #define PROC_PS_STRINGS(p) \ 78 ((p)->p_vmspace->vm_stacktop - (p)->p_sysent->sv_psstringssz) 79 80 /* 81 * Address of signal trampoline (in user space). 82 * This assumes that the sigcode resides in the shared page. 83 */ 84 #define PROC_SIGCODE(p) \ 85 ((p)->p_vmspace->vm_shp_base + (p)->p_sysent->sv_sigcode_offset) 86 87 #define PROC_HAS_SHP(p) \ 88 ((p)->p_sysent->sv_shared_page_obj != NULL) 89 90 int exec_map_first_page(struct image_params *); 91 void exec_unmap_first_page(struct image_params *); 92 93 int exec_register(const struct execsw *); 94 int exec_unregister(const struct execsw *); 95 96 enum uio_seg; 97 98 /* 99 * note: name##_mod cannot be const storage because the 100 * linker_file_sysinit() function modifies _file in the 101 * moduledata_t. 102 */ 103 104 #include <sys/module.h> 105 106 #define EXEC_SET(name, execsw_arg) \ 107 static int __CONCAT(name,_modevent)(module_t mod, int type, \ 108 void *data) \ 109 { \ 110 struct execsw *exec = (struct execsw *)data; \ 111 int error = 0; \ 112 switch (type) { \ 113 case MOD_LOAD: \ 114 /* printf(#name " module loaded\n"); */ \ 115 error = exec_register(exec); \ 116 if (error) \ 117 printf(__XSTRING(name) "register failed\n"); \ 118 break; \ 119 case MOD_UNLOAD: \ 120 /* printf(#name " module unloaded\n"); */ \ 121 error = exec_unregister(exec); \ 122 if (error) \ 123 printf(__XSTRING(name) " unregister failed\n");\ 124 break; \ 125 default: \ 126 error = EOPNOTSUPP; \ 127 break; \ 128 } \ 129 return error; \ 130 } \ 131 static moduledata_t __CONCAT(name,_mod) = { \ 132 __XSTRING(name), \ 133 __CONCAT(name,_modevent), \ 134 (void *)& execsw_arg \ 135 }; \ 136 DECLARE_MODULE_TIED(name, __CONCAT(name,_mod), SI_SUB_EXEC, \ 137 SI_ORDER_ANY) 138 #endif 139 140 #endif 141