1 /*- 2 * Copyright (c) 1994-1996 S�ren Schmidt 3 * All rights reserved. 4 * 5 * Based heavily on /sys/kern/imgact_aout.c which is: 6 * Copyright (c) 1993, David Greenman 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software withough specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $Id: imgact_linux.c,v 1.10 1996/03/10 08:42:49 sos 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/imgact_aout.h> 41 #include <sys/kernel.h> 42 #include <sys/sysent.h> 43 44 #include <vm/vm.h> 45 #include <vm/vm_kern.h> 46 #include <vm/vm_param.h> 47 #include <vm/pmap.h> 48 #include <vm/lock.h> 49 #include <vm/vm_map.h> 50 #include <vm/vm_prot.h> 51 #include <vm/vm_extern.h> 52 53 #include <i386/linux/linux.h> 54 #include <i386/linux/linux_proto.h> 55 56 extern int exec_linux_imgact __P((struct image_params *iparams)); 57 58 int 59 exec_linux_imgact(imgp) 60 struct image_params *imgp; 61 { 62 struct exec *a_out = (struct exec *) imgp->image_header; 63 struct vmspace *vmspace = imgp->proc->p_vmspace; 64 unsigned long vmaddr, virtual_offset, file_offset; 65 unsigned long buffer, bss_size; 66 int error; 67 68 if (((a_out->a_magic >> 16) & 0xff) != 0x64) 69 return -1; 70 71 /* 72 * Set file/virtual offset based on a.out variant. 73 */ 74 switch ((int)(a_out->a_magic & 0xffff)) { 75 case 0413: 76 virtual_offset = 0; 77 file_offset = 1024; 78 break; 79 case 0314: 80 virtual_offset = 4096; 81 file_offset = 0; 82 break; 83 default: 84 return (-1); 85 } 86 bss_size = round_page(a_out->a_bss); 87 #ifdef DEBUG 88 printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size); 89 #endif 90 91 /* 92 * Check various fields in header for validity/bounds. 93 */ 94 if (a_out->a_entry < virtual_offset || 95 a_out->a_entry >= virtual_offset + a_out->a_text || 96 a_out->a_text % NBPG || a_out->a_data % NBPG) 97 return (-1); 98 99 /* text + data can't exceed file size */ 100 if (a_out->a_data + a_out->a_text > imgp->attr->va_size) 101 return (EFAULT); 102 /* 103 * text/data/bss must not exceed limits 104 */ 105 if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ || 106 a_out->a_data+bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur) 107 return (ENOMEM); 108 109 /* copy in arguments and/or environment from old process */ 110 error = exec_extract_strings(imgp); 111 if (error) 112 return (error); 113 114 /* 115 * Destroy old process VM and create a new one (with a new stack) 116 */ 117 exec_new_vmspace(imgp); 118 119 /* 120 * Check if file_offset page aligned,. 121 * Currently we cannot handle misalinged file offsets, 122 * and so we read in the entire image (what a waste). 123 */ 124 if (file_offset & PGOFSET) { 125 #ifdef DEBUG 126 printf("imgact: Non page aligned binary %d\n", file_offset); 127 #endif 128 /* 129 * Map text+data+bss read/write/execute 130 */ 131 vmaddr = virtual_offset; 132 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 133 a_out->a_text + a_out->a_data + bss_size, FALSE, 134 VM_PROT_ALL, VM_PROT_ALL, 0); 135 if (error) 136 return error; 137 138 error = vm_mmap(kernel_map, &buffer, 139 round_page(a_out->a_text + a_out->a_data + file_offset), 140 VM_PROT_READ, VM_PROT_READ, MAP_FILE, 141 (caddr_t) imgp->vp, trunc_page(file_offset)); 142 if (error) 143 return error; 144 145 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, 146 a_out->a_text + a_out->a_data); 147 148 vm_map_remove(kernel_map, buffer, 149 buffer + round_page(a_out->a_text + a_out->a_data + file_offset)); 150 151 if (error) 152 return error; 153 154 /* 155 * remove write enable on the 'text' part 156 */ 157 error = vm_map_protect(&vmspace->vm_map, 158 vmaddr, 159 vmaddr + a_out->a_text, 160 VM_PROT_EXECUTE|VM_PROT_READ, 161 TRUE); 162 if (error) 163 return error; 164 } 165 else { 166 #ifdef DEBUG 167 printf("imgact: Page aligned binary %d\n", file_offset); 168 #endif 169 /* 170 * Map text+data read/execute 171 */ 172 vmaddr = virtual_offset; 173 error = vm_mmap(&vmspace->vm_map, &vmaddr, 174 a_out->a_text + a_out->a_data, 175 VM_PROT_READ | VM_PROT_EXECUTE, 176 VM_PROT_ALL, 177 MAP_PRIVATE | MAP_FIXED, 178 (caddr_t)imgp->vp, file_offset); 179 if (error) 180 return (error); 181 182 #ifdef DEBUG 183 printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data); 184 #endif 185 /* 186 * allow read/write of data 187 */ 188 error = vm_map_protect(&vmspace->vm_map, 189 vmaddr + a_out->a_text, 190 vmaddr + a_out->a_text + a_out->a_data, 191 VM_PROT_ALL, 192 FALSE); 193 if (error) 194 return (error); 195 196 /* 197 * Allocate anon demand-zeroed area for uninitialized data 198 */ 199 if (bss_size != 0) { 200 vmaddr = virtual_offset + a_out->a_text + a_out->a_data; 201 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 202 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 203 if (error) 204 return (error); 205 #ifdef DEBUG 206 printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size); 207 #endif 208 209 } 210 /* Indicate that this file should not be modified */ 211 imgp->vp->v_flag |= VTEXT; 212 } 213 /* Fill in process VM information */ 214 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT; 215 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT; 216 vmspace->vm_taddr = (caddr_t)virtual_offset; 217 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text; 218 219 /* Fill in image_params */ 220 imgp->interpreted = 0; 221 imgp->entry_addr = a_out->a_entry; 222 223 imgp->proc->p_sysent = &linux_sysvec; 224 return (0); 225 } 226 227 /* 228 * Tell kern_execve.c about it, with a little help from the linker. 229 * Since `const' objects end up in the text segment, TEXT_SET is the 230 * correct directive to use. 231 */ 232 const struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" }; 233 TEXT_SET(execsw_set, linux_execsw); 234 235