imgact_linux.c revision 10221
1/*- 2 * Copyright (c) 1994-1995 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 1.1 1995/06/25 17:32:32 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 47int 48exec_linux_imgact(iparams) 49 struct image_params *iparams; 50{ 51 struct exec *a_out = (struct exec *) iparams->image_header; 52 struct vmspace *vmspace = iparams->proc->p_vmspace; 53 unsigned long vmaddr, virtual_offset, file_offset; 54 unsigned long buffer, bss_size; 55 int error; 56 extern struct sysentvec linux_sysvec; 57 58 if (((a_out->a_magic >> 16) & 0xff) != 0x64) 59 return -1; 60 61 /* 62 * Set file/virtual offset based on a.out variant. 63 */ 64 switch ((int)(a_out->a_magic & 0xffff)) { 65 case 0413: 66 virtual_offset = 0; 67 file_offset = 1024; 68 break; 69 case 0314: 70 virtual_offset = 4096; 71 file_offset = 0; 72 break; 73 default: 74 return (-1); 75 } 76 bss_size = round_page(a_out->a_bss); 77 78 /* 79 * Check various fields in header for validity/bounds. 80 */ 81 if (a_out->a_entry < virtual_offset || 82 a_out->a_entry >= virtual_offset + a_out->a_text || 83 a_out->a_text % NBPG || a_out->a_data % NBPG) 84 return (-1); 85 86 /* text + data can't exceed file size */ 87 if (a_out->a_data + a_out->a_text > iparams->attr->va_size) 88 return (EFAULT); 89 /* 90 * text/data/bss must not exceed limits 91 */ 92 if (a_out->a_text > MAXTSIZ || a_out->a_data + bss_size > MAXDSIZ || 93 a_out->a_data+bss_size > iparams->proc->p_rlimit[RLIMIT_DATA].rlim_cur) 94 return (ENOMEM); 95 96 /* copy in arguments and/or environment from old process */ 97 error = exec_extract_strings(iparams); 98 if (error) 99 return (error); 100 101 /* 102 * Destroy old process VM and create a new one (with a new stack) 103 */ 104 exec_new_vmspace(iparams); 105 106 /* 107 * Check if file_offset page aligned,. 108 * Currently we cannot handle misalinged file offsets, 109 * and so we read in the entire image (what a waste). 110 */ 111 if (file_offset & PGOFSET) { 112#ifdef DEBUG 113 printf("imgact: Non page aligned binary %d\n", file_offset); 114#endif 115 /* 116 * Map text read/execute 117 */ 118 vmaddr = virtual_offset; 119 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 120 round_page(a_out->a_text), FALSE); 121 if (error) 122 return error; 123 124 error = vm_mmap(kernel_map, &buffer, 125 round_page(a_out->a_text + file_offset), 126 VM_PROT_READ, VM_PROT_READ, MAP_FILE, 127 (caddr_t) iparams->vnodep, trunc_page(file_offset)); 128 if (error) 129 return error; 130 131 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, 132 a_out->a_text); 133 if (error) 134 return error; 135 136 vm_map_remove(kernel_map, trunc_page(vmaddr), 137 round_page(a_out->a_text + file_offset)); 138 139 error = vm_map_protect(&vmspace->vm_map, vmaddr, 140 round_page(a_out->a_text), 141 VM_PROT_EXECUTE|VM_PROT_READ, TRUE); 142 if (error) 143 return error; 144 /* 145 * Map data read/write 146 */ 147 vmaddr = virtual_offset + a_out->a_text; 148 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 149 round_page(a_out->a_data + bss_size), FALSE); 150 if (error) 151 return error; 152 153 error = vm_mmap(kernel_map, &buffer, 154 round_page(a_out->a_data + file_offset), 155 VM_PROT_READ, VM_PROT_READ, MAP_FILE, 156 (caddr_t) iparams->vnodep, 157 trunc_page(a_out->a_text + file_offset)); 158 if (error) 159 return error; 160 161 error = copyout((caddr_t)(buffer + file_offset), 162 (caddr_t)vmaddr, 163 a_out->a_data); 164 if (error) 165 return error; 166 167 vm_map_remove(kernel_map, trunc_page(vmaddr), 168 round_page(a_out->a_data + file_offset)); 169 170 error = vm_map_protect(&vmspace->vm_map, vmaddr, 171 round_page(a_out->a_data + bss_size), 172 VM_PROT_WRITE|VM_PROT_READ, TRUE); 173 if (error) 174 return error; 175 } 176 else { 177#ifdef DEBUG 178 printf("imgact: Page aligned binary %d\n", file_offset); 179#endif 180 /* 181 * Map text read/execute 182 */ 183 vmaddr = virtual_offset; 184 error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_text, 185 VM_PROT_READ | VM_PROT_EXECUTE, 186 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, 187 MAP_PRIVATE | MAP_FIXED, 188 (caddr_t)iparams->vnodep, file_offset); 189 if (error) 190 return (error); 191 192 /* 193 * Map data read/write 194 */ 195 vmaddr = virtual_offset + a_out->a_text; 196 error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_data, 197 VM_PROT_READ | VM_PROT_WRITE, 198 VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, 199 (caddr_t)iparams->vnodep, file_offset + a_out->a_text); 200 if (error) 201 return (error); 202 203 /* 204 * Allocate demand-zeroed area for uninitialized data 205 */ 206 if (bss_size != 0) { 207 vmaddr = virtual_offset + a_out->a_text + a_out->a_data; 208 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 209 bss_size, FALSE); 210 if (error) 211 return (error); 212 } 213 /* Indicate that this file should not be modified */ 214 iparams->vnodep->v_flag |= VTEXT; 215 } 216 /* Fill in process VM information */ 217 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT; 218 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT; 219 vmspace->vm_taddr = (caddr_t)virtual_offset; 220 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text; 221 222 /* Fill in image_params */ 223 iparams->interpreted = 0; 224 iparams->entry_addr = a_out->a_entry; 225 226 iparams->proc->p_sysent = &linux_sysvec; 227 return (0); 228} 229 230/* 231 * Tell kern_execve.c about it, with a little help from the linker. 232 * Since `const' objects end up in the text segment, TEXT_SET is the 233 * correct directive to use. 234 */ 235const struct execsw linux_execsw = { exec_linux_imgact, "linux" }; 236TEXT_SET(execsw_set, linux_execsw); 237 238