Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/imgact_coff.c
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1 /*- 2 * Copyright (c) 1994 Sean Eric Fagan 3 * Copyright (c) 1994 Søren Schmidt 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software withough specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/i386/ibcs2/imgact_coff.c,v 1.17.2.1 1999/09/05 08:11:31 peter Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/resourcevar.h> 35 #include <sys/exec.h> 36 #include <sys/mman.h> 37 #include <sys/imgact.h> 38 #include <sys/kernel.h> 39 #include <sys/file.h> 40 #include <sys/malloc.h> 41 #include <sys/mount.h> 42 #include <sys/namei.h> 43 #include <sys/sysent.h> 44 #include <sys/vnode.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_param.h> 48 #include <vm/vm_prot.h> 49 #include <vm/lock.h> 50 #include <vm/pmap.h> 51 #include <vm/vm_map.h> 52 #include <vm/vm_kern.h> 53 #include <vm/vm_extern.h> 54 55 #include <i386/ibcs2/coff.h> 56 #include <i386/ibcs2/ibcs2_util.h> 57 58 extern struct sysentvec ibcs2_svr3_sysvec; 59 60 extern int coff_load_file __P((struct proc *p, char *name)); 61 extern int exec_coff_imgact __P((struct image_params *imgp)); 62 63 static int load_coff_section __P((struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)); 64 65 static int 66 load_coff_section(vmspace, vp, offset, vmaddr, memsz, filsz, prot) 67 struct vmspace *vmspace; 68 struct vnode *vp; 69 vm_offset_t offset; 70 caddr_t vmaddr; 71 size_t memsz, filsz; 72 vm_prot_t prot; 73 { 74 size_t map_len; 75 vm_offset_t map_offset; 76 vm_offset_t map_addr; 77 int error; 78 unsigned char *data_buf = 0; 79 size_t copy_len; 80 81 map_offset = trunc_page(offset); 82 map_addr = trunc_page(vmaddr); 83 84 if (memsz > filsz) { 85 /* 86 * We have the stupid situation that 87 * the section is longer than it is on file, 88 * which means it has zero-filled areas, and 89 * we have to work for it. Stupid iBCS! 90 */ 91 map_len = trunc_page(offset + filsz) - trunc_page(map_offset); 92 } else { 93 /* 94 * The only stuff we care about is on disk, and we 95 * don't care if we map in more than is really there. 96 */ 97 map_len = round_page(offset + filsz) - trunc_page(map_offset); 98 } 99 100 DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, " 101 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n", 102 __FILE__, __LINE__, map_addr, map_len, prot, map_offset)); 103 104 if (error = vm_mmap(&vmspace->vm_map, 105 &map_addr, 106 map_len, 107 prot, 108 VM_PROT_ALL, 109 MAP_PRIVATE | MAP_FIXED, 110 (caddr_t) vp, 111 map_offset)) 112 return error; 113 114 if (memsz == filsz) { 115 /* We're done! */ 116 return 0; 117 } 118 119 /* 120 * Now we have screwball stuff, to accomodate stupid COFF. 121 * We have to map the remaining bit of the file into the kernel's 122 * memory map, allocate some anonymous memory, copy that last 123 * bit into it, and then we're done. *sigh* 124 * For clean-up reasons, we actally map in the file last. 125 */ 126 127 copy_len = (offset + filsz) - trunc_page(offset + filsz); 128 map_addr = trunc_page(vmaddr + filsz); 129 map_len = round_page(vmaddr + memsz) - map_addr; 130 131 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx,0x%x, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", __FILE__, __LINE__, map_addr, map_len)); 132 133 if (map_len != 0) { 134 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr, 135 map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 136 if (error) 137 return error; 138 } 139 140 if (error = vm_mmap(kernel_map, 141 (vm_offset_t *) &data_buf, 142 PAGE_SIZE, 143 VM_PROT_READ, 144 VM_PROT_READ, 145 0, 146 (caddr_t) vp, 147 trunc_page(offset + filsz))) 148 return error; 149 150 error = copyout(data_buf, (caddr_t) map_addr, copy_len); 151 152 if (vm_map_remove(kernel_map, 153 (vm_offset_t) data_buf, 154 (vm_offset_t) data_buf + PAGE_SIZE)) 155 panic("load_coff_section vm_map_remove failed"); 156 157 return error; 158 } 159 160 int 161 coff_load_file(struct proc *p, char *name) 162 { 163 struct vmspace *vmspace = p->p_vmspace; 164 int error; 165 struct nameidata nd; 166 struct vnode *vp; 167 struct vattr attr; 168 struct filehdr *fhdr; 169 struct aouthdr *ahdr; 170 struct scnhdr *scns; 171 char *ptr = 0; 172 int nscns; 173 unsigned long text_offset = 0, text_address = 0, text_size = 0; 174 unsigned long data_offset = 0, data_address = 0, data_size = 0; 175 unsigned long bss_size = 0; 176 int i; 177 178 /* XXX use of 'curproc' should be 'p'?*/ 179 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, curproc); 180 181 error = namei(&nd); 182 if (error) 183 return error; 184 185 vp = nd.ni_vp; 186 if (vp == NULL) 187 return ENOEXEC; 188 189 if (vp->v_writecount) { 190 error = ETXTBSY; 191 goto fail; 192 } 193 194 if (error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) 195 goto fail; 196 197 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) 198 || ((attr.va_mode & 0111) == 0) 199 || (attr.va_type != VREG)) 200 goto fail; 201 202 if (attr.va_size == 0) { 203 error = ENOEXEC; 204 goto fail; 205 } 206 207 if (error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) 208 goto fail; 209 210 if (error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) 211 goto fail; 212 213 /* 214 * Lose the lock on the vnode. It's no longer needed, and must not 215 * exist for the pagefault paging to work below. 216 */ 217 VOP_UNLOCK(vp); 218 219 if (error = vm_mmap(kernel_map, 220 (vm_offset_t *) &ptr, 221 PAGE_SIZE, 222 VM_PROT_READ, 223 VM_PROT_READ, 224 0, 225 (caddr_t) vp, 226 0)) 227 goto fail; 228 229 fhdr = (struct filehdr *)ptr; 230 231 if (fhdr->f_magic != I386_COFF) { 232 error = ENOEXEC; 233 goto dealloc_and_fail; 234 } 235 236 nscns = fhdr->f_nscns; 237 238 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 239 /* 240 * XXX -- just fail. I'm so lazy. 241 */ 242 error = ENOEXEC; 243 goto dealloc_and_fail; 244 } 245 246 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 247 248 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 249 + sizeof(struct aouthdr)); 250 251 for (i = 0; i < nscns; i++) { 252 if (scns[i].s_flags & STYP_NOLOAD) 253 continue; 254 else if (scns[i].s_flags & STYP_TEXT) { 255 text_address = scns[i].s_vaddr; 256 text_size = scns[i].s_size; 257 text_offset = scns[i].s_scnptr; 258 } 259 else if (scns[i].s_flags & STYP_DATA) { 260 data_address = scns[i].s_vaddr; 261 data_size = scns[i].s_size; 262 data_offset = scns[i].s_scnptr; 263 } else if (scns[i].s_flags & STYP_BSS) { 264 bss_size = scns[i].s_size; 265 } 266 } 267 268 if (error = load_coff_section(vmspace, vp, text_offset, 269 (caddr_t)text_address, 270 text_size, text_size, 271 VM_PROT_READ | VM_PROT_EXECUTE)) { 272 goto dealloc_and_fail; 273 } 274 if (error = load_coff_section(vmspace, vp, data_offset, 275 (caddr_t)data_address, 276 data_size + bss_size, data_size, 277 VM_PROT_ALL)) { 278 goto dealloc_and_fail; 279 } 280 281 error = 0; 282 283 dealloc_and_fail: 284 if (vm_map_remove(kernel_map, 285 (vm_offset_t) ptr, 286 (vm_offset_t) ptr + PAGE_SIZE)) 287 panic(__FUNCTION__ " vm_map_remove failed"); 288 289 fail: 290 vput(nd.ni_vp); 291 FREE(nd.ni_cnd.cn_pnbuf, M_NAMEI); 292 return error; 293 } 294 295 int 296 exec_coff_imgact(imgp) 297 struct image_params *imgp; 298 { 299 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header; 300 const struct aouthdr *ahdr; 301 const struct scnhdr *scns; 302 int i; 303 struct vmspace *vmspace = imgp->proc->p_vmspace; 304 int nscns; 305 int error; 306 unsigned long text_offset = 0, text_address = 0, text_size = 0; 307 unsigned long data_offset = 0, data_address = 0, data_size = 0; 308 unsigned long bss_size = 0; 309 caddr_t hole; 310 311 if (fhdr->f_magic != I386_COFF || 312 !(fhdr->f_flags & F_EXEC)) { 313 314 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 315 return -1; 316 } 317 318 nscns = fhdr->f_nscns; 319 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 320 /* 321 * For now, return an error -- need to be able to 322 * read in all of the section structures. 323 */ 324 325 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 326 return -1; 327 } 328 329 ahdr = (const struct aouthdr*) 330 ((const char*)(imgp->image_header) + sizeof(struct filehdr)); 331 imgp->entry_addr = ahdr->entry; 332 333 scns = (const struct scnhdr*) 334 ((const char*)(imgp->image_header) + sizeof(struct filehdr) + 335 sizeof(struct aouthdr)); 336 337 if (error = exec_extract_strings(imgp)) { 338 DPRINTF(("%s(%d): return %d\n", __FILE__, __LINE__, error)); 339 return error; 340 } 341 342 exec_new_vmspace(imgp); 343 344 for (i = 0; i < nscns; i++) { 345 346 DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, " 347 "scns[i].s_scnptr = %d\n", i, scns[i].s_name, 348 scns[i].s_vaddr, scns[i].s_scnptr)); 349 if (scns[i].s_flags & STYP_NOLOAD) { 350 /* 351 * A section that is not loaded, for whatever 352 * reason. It takes precedance over other flag 353 * bits... 354 */ 355 continue; 356 } else if (scns[i].s_flags & STYP_TEXT) { 357 text_address = scns[i].s_vaddr; 358 text_size = scns[i].s_size; 359 text_offset = scns[i].s_scnptr; 360 } else if (scns[i].s_flags & STYP_DATA) { 361 /* .data section */ 362 data_address = scns[i].s_vaddr; 363 data_size = scns[i].s_size; 364 data_offset = scns[i].s_scnptr; 365 } else if (scns[i].s_flags & STYP_BSS) { 366 /* .bss section */ 367 bss_size = scns[i].s_size; 368 } else if (scns[i].s_flags & STYP_LIB) { 369 char *buf = 0; 370 int foff = trunc_page(scns[i].s_scnptr); 371 int off = scns[i].s_scnptr - foff; 372 int len = round_page(scns[i].s_size + PAGE_SIZE); 373 int j; 374 375 if (error = vm_mmap(kernel_map, 376 (vm_offset_t *) &buf, 377 len, 378 VM_PROT_READ, 379 VM_PROT_READ, 380 0, 381 (caddr_t) imgp->vp, 382 foff)) { 383 return ENOEXEC; 384 } 385 if(scns[i].s_size) { 386 char *libbuf; 387 int emul_path_len = strlen(ibcs2_emul_path); 388 389 libbuf = malloc(MAXPATHLEN + emul_path_len, 390 M_TEMP, M_WAITOK); 391 strcpy(libbuf, ibcs2_emul_path); 392 393 for (j = off; j < scns[i].s_size + off; j++) { 394 char *libname; 395 396 libname = buf + j + 4 * *(long*)(buf + j + 4); 397 j += 4* *(long*)(buf + j); 398 399 DPRINTF(("%s(%d): shared library %s\n", 400 __FILE__, __LINE__, libname)); 401 strcpy(&libbuf[emul_path_len], libname); 402 error = coff_load_file(imgp->proc, libbuf); 403 if (error) 404 error = coff_load_file(imgp->proc, 405 libname); 406 if (error) 407 break; 408 } 409 free(libbuf, M_TEMP); 410 } 411 if (vm_map_remove(kernel_map, 412 (vm_offset_t) buf, 413 (vm_offset_t) buf + len)) 414 panic("exec_coff_imgact vm_map_remove failed"); 415 if (error) 416 return error; 417 } 418 } 419 /* 420 * Map in .text now 421 */ 422 423 DPRINTF(("%s(%d): load_coff_section(vmspace, " 424 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n", 425 __FILE__, __LINE__, text_offset, text_address, 426 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE)); 427 if (error = load_coff_section(vmspace, imgp->vp, 428 text_offset, (caddr_t)text_address, 429 text_size, text_size, 430 VM_PROT_READ | VM_PROT_EXECUTE)) { 431 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 432 return error; 433 } 434 /* 435 * Map in .data and .bss now 436 */ 437 438 439 DPRINTF(("%s(%d): load_coff_section(vmspace, " 440 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n", 441 __FILE__, __LINE__, data_offset, data_address, 442 data_size + bss_size, data_size, VM_PROT_ALL)); 443 if (error = load_coff_section(vmspace, imgp->vp, 444 data_offset, (caddr_t)data_address, 445 data_size + bss_size, data_size, 446 VM_PROT_ALL)) { 447 448 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 449 return error; 450 } 451 452 imgp->interpreted = 0; 453 imgp->proc->p_sysent = &ibcs2_svr3_sysvec; 454 455 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 456 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 457 vmspace->vm_taddr = (caddr_t)text_address; 458 vmspace->vm_daddr = (caddr_t)data_address; 459 460 hole = (caddr_t)trunc_page(vmspace->vm_daddr) + ctob(vmspace->vm_dsize); 461 462 463 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", 464 __FILE__, __LINE__, hole)); 465 DPRINTF(("imgact: error = %d\n", error)); 466 467 error = vm_map_find(&vmspace->vm_map, NULL, 0, 468 (vm_offset_t *) &hole, PAGE_SIZE, FALSE, 469 VM_PROT_ALL, VM_PROT_ALL, 0); 470 471 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n", 472 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 473 ctob(vmspace->vm_dsize) + vmspace->vm_daddr )); 474 DPRINTF(("%s(%d): returning successfully!\n", __FILE__, __LINE__)); 475 476 /* Indicate that this file should not be modified */ 477 imgp->vp->v_flag |= VTEXT; 478 return 0; 479 } 480 481 /* 482 * Tell kern_execve.c about it, with a little help from the linker. 483 * Since `const' objects end up in the text segment, TEXT_SET is the 484 * correct directive to use. 485 */ 486 const struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 487 TEXT_SET(execsw_set, coff_execsw);
Cache object: 88fcc5bad9a984ae4b3008f6e0fd7453
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