1 /* 2 * Copyright (c) 1993, David Greenman 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by David Greenman 16 * 4. The name of the developer may be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $Id: imgact_aout.c,v 1.3 1993/12/30 01:39:29 davidg Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/resourcevar.h> 37 #include <sys/exec.h> 38 #include <sys/mman.h> 39 #include <sys/imgact.h> 40 #include <sys/kernel.h> 41 42 #include <vm/vm.h> 43 44 int 45 exec_aout_imgact(iparams) 46 struct image_params *iparams; 47 { 48 struct exec *a_out = (struct exec *) iparams->image_header; 49 struct vmspace *vmspace = iparams->proc->p_vmspace; 50 unsigned long vmaddr, virtual_offset, file_offset; 51 unsigned long bss_size; 52 int error, len; 53 54 /* 55 * Set file/virtual offset based on a.out variant. 56 * We do two cases: host byte order and network byte order 57 * (for NetBSD compatibility) 58 */ 59 switch ((int)(a_out->a_magic & 0xffff)) { 60 case ZMAGIC: 61 virtual_offset = 0; 62 if (a_out->a_text) { 63 file_offset = NBPG; 64 } else { 65 /* Bill's "screwball mode" */ 66 file_offset = 0; 67 } 68 break; 69 case QMAGIC: 70 virtual_offset = NBPG; 71 file_offset = 0; 72 break; 73 default: 74 /* NetBSD compatibility */ 75 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) { 76 case ZMAGIC: 77 case QMAGIC: 78 virtual_offset = NBPG; 79 file_offset = 0; 80 break; 81 default: 82 return (-1); 83 } 84 } 85 86 bss_size = roundup(a_out->a_bss, NBPG); 87 88 /* 89 * Check various fields in header for validity/bounds. 90 */ 91 if (/* entry point must lay with text region */ 92 a_out->a_entry < virtual_offset || 93 a_out->a_entry >= virtual_offset + a_out->a_text || 94 95 /* text and data size must each be page rounded */ 96 a_out->a_text % NBPG || 97 a_out->a_data % NBPG) 98 return (-1); 99 100 /* text + data can't exceed file size */ 101 if (a_out->a_data + a_out->a_text > iparams->attr->va_size) 102 return (EFAULT); 103 104 /* 105 * text/data/bss must not exceed limits 106 */ 107 if (/* text can't exceed maximum text size */ 108 a_out->a_text > MAXTSIZ || 109 110 /* data + bss can't exceed maximum data size */ 111 a_out->a_data + bss_size > MAXDSIZ || 112 113 /* data + bss can't exceed rlimit */ 114 a_out->a_data + bss_size > 115 iparams->proc->p_rlimit[RLIMIT_DATA].rlim_cur) 116 return (ENOMEM); 117 118 /* copy in arguments and/or environment from old process */ 119 error = exec_extract_strings(iparams); 120 if (error) 121 return (error); 122 123 /* 124 * Destroy old process VM and create a new one (with a new stack) 125 */ 126 exec_new_vmspace(iparams); 127 128 /* 129 * Map text read/execute 130 */ 131 vmaddr = virtual_offset; 132 error = 133 vm_mmap(&vmspace->vm_map, /* map */ 134 &vmaddr, /* address */ 135 a_out->a_text, /* size */ 136 VM_PROT_READ | VM_PROT_EXECUTE, /* protection */ 137 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* max protection */ 138 MAP_PRIVATE | MAP_FIXED, /* flags */ 139 (caddr_t)iparams->vnodep, /* vnode */ 140 file_offset); /* offset */ 141 if (error) 142 return (error); 143 144 /* 145 * Map data read/write (if text is 0, assume text is in data area 146 * [Bill's screwball mode]) 147 */ 148 vmaddr = virtual_offset + a_out->a_text; 149 error = 150 vm_mmap(&vmspace->vm_map, 151 &vmaddr, 152 a_out->a_data, 153 VM_PROT_READ | VM_PROT_WRITE | (a_out->a_text ? 0 : VM_PROT_EXECUTE), 154 VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, 155 (caddr_t) iparams->vnodep, 156 file_offset + a_out->a_text); 157 if (error) 158 return (error); 159 160 /* 161 * Allocate demand-zeroed area for uninitialized data 162 * "bss" = 'block started by symbol' - named after the IBM 7090 163 * instruction of the same name. 164 */ 165 vmaddr = virtual_offset + a_out->a_text + a_out->a_data; 166 error = vm_allocate(&vmspace->vm_map, &vmaddr, bss_size, FALSE); 167 if (error) 168 return (error); 169 170 /* Fill in process VM information */ 171 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; 172 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; 173 vmspace->vm_taddr = (caddr_t) virtual_offset; 174 vmspace->vm_daddr = (caddr_t) virtual_offset + a_out->a_text; 175 176 /* Fill in image_params */ 177 iparams->interpreted = 0; 178 iparams->entry_addr = a_out->a_entry; 179 180 return (0); 181 } 182 183 /* 184 * Tell kern_execve.c about it, with a little help from the linker. 185 * Since `const' objects end up in the text segment, TEXT_SET is the 186 * correct directive to use. 187 */ 188 static const struct execsw aout_execsw = { exec_aout_imgact }; 189 TEXT_SET(execsw_set, aout_execsw); 190 191