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 without 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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD: releng/8.4/sys/i386/ibcs2/imgact_coff.c 224727 2011-08-09 08:09:32Z kib $"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/exec.h> 36 #include <sys/fcntl.h> 37 #include <sys/imgact.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/mman.h> 42 #include <sys/mount.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 46 #include <vm/vm.h> 47 #include <vm/pmap.h> 48 #include <vm/vm_map.h> 49 #include <vm/vm_kern.h> 50 #include <vm/vm_extern.h> 51 52 #include <i386/ibcs2/coff.h> 53 #include <i386/ibcs2/ibcs2_util.h> 54 55 MODULE_DEPEND(coff, ibcs2, 1, 1, 1); 56 57 extern struct sysentvec ibcs2_svr3_sysvec; 58 59 static int coff_load_file(struct thread *td, char *name); 60 static int exec_coff_imgact(struct image_params *imgp); 61 62 static int load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot); 63 64 static int 65 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, 66 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) 67 { 68 size_t map_len; 69 vm_offset_t map_offset; 70 vm_offset_t map_addr; 71 int error; 72 unsigned char *data_buf = 0; 73 size_t copy_len; 74 75 map_offset = trunc_page(offset); 76 map_addr = trunc_page((vm_offset_t)vmaddr); 77 78 if (memsz > filsz) { 79 /* 80 * We have the stupid situation that 81 * the section is longer than it is on file, 82 * which means it has zero-filled areas, and 83 * we have to work for it. Stupid iBCS! 84 */ 85 map_len = trunc_page(offset + filsz) - trunc_page(map_offset); 86 } else { 87 /* 88 * The only stuff we care about is on disk, and we 89 * don't care if we map in more than is really there. 90 */ 91 map_len = round_page(offset + filsz) - trunc_page(map_offset); 92 } 93 94 DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08jx, 0x%x, 0x%x, " 95 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, 0x%x)\n", 96 __FILE__, __LINE__, (uintmax_t)map_addr, map_len, prot, 97 map_offset)); 98 99 if ((error = vm_mmap(&vmspace->vm_map, 100 &map_addr, 101 map_len, 102 prot, 103 VM_PROT_ALL, 104 MAP_PRIVATE | MAP_FIXED, 105 OBJT_VNODE, 106 vp, 107 map_offset)) != 0) 108 return error; 109 110 if (memsz == filsz) { 111 /* We're done! */ 112 return 0; 113 } 114 115 /* 116 * Now we have screwball stuff, to accomodate stupid COFF. 117 * We have to map the remaining bit of the file into the kernel's 118 * memory map, allocate some anonymous memory, copy that last 119 * bit into it, and then we're done. *sigh* 120 * For clean-up reasons, we actally map in the file last. 121 */ 122 123 copy_len = (offset + filsz) - trunc_page(offset + filsz); 124 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 125 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 126 127 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08jx,0x%x, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", __FILE__, __LINE__, (uintmax_t)map_addr, map_len)); 128 129 if (map_len != 0) { 130 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr, 131 map_len, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0); 132 if (error) 133 return (vm_mmap_to_errno(error)); 134 } 135 136 if ((error = vm_mmap(exec_map, 137 (vm_offset_t *) &data_buf, 138 PAGE_SIZE, 139 VM_PROT_READ, 140 VM_PROT_READ, 141 0, 142 OBJT_VNODE, 143 vp, 144 trunc_page(offset + filsz))) != 0) 145 return error; 146 147 error = copyout(data_buf, (caddr_t) map_addr, copy_len); 148 149 if (vm_map_remove(exec_map, 150 (vm_offset_t) data_buf, 151 (vm_offset_t) data_buf + PAGE_SIZE)) 152 panic("load_coff_section vm_map_remove failed"); 153 154 return error; 155 } 156 157 static int 158 coff_load_file(struct thread *td, char *name) 159 { 160 struct proc *p = td->td_proc; 161 struct vmspace *vmspace = p->p_vmspace; 162 int error; 163 struct nameidata nd; 164 struct vnode *vp; 165 struct vattr attr; 166 struct filehdr *fhdr; 167 struct aouthdr *ahdr; 168 struct scnhdr *scns; 169 char *ptr = 0; 170 int nscns; 171 unsigned long text_offset = 0, text_address = 0, text_size = 0; 172 unsigned long data_offset = 0, data_address = 0, data_size = 0; 173 unsigned long bss_size = 0; 174 int i; 175 176 NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME, 177 UIO_SYSSPACE, name, td); 178 179 error = namei(&nd); 180 if (error) 181 return error; 182 183 vp = nd.ni_vp; 184 if (vp == NULL) 185 return ENOEXEC; 186 187 if (vp->v_writecount) { 188 error = ETXTBSY; 189 goto fail; 190 } 191 192 if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0) 193 goto fail; 194 195 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) 196 || ((attr.va_mode & 0111) == 0) 197 || (attr.va_type != VREG)) 198 goto fail; 199 200 if (attr.va_size == 0) { 201 error = ENOEXEC; 202 goto fail; 203 } 204 205 if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0) 206 goto fail; 207 208 if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0) 209 goto fail; 210 211 /* 212 * Lose the lock on the vnode. It's no longer needed, and must not 213 * exist for the pagefault paging to work below. 214 */ 215 VOP_UNLOCK(vp, 0); 216 217 if ((error = vm_mmap(exec_map, 218 (vm_offset_t *) &ptr, 219 PAGE_SIZE, 220 VM_PROT_READ, 221 VM_PROT_READ, 222 0, 223 OBJT_VNODE, 224 vp, 225 0)) != 0) 226 goto unlocked_fail; 227 228 fhdr = (struct filehdr *)ptr; 229 230 if (fhdr->f_magic != I386_COFF) { 231 error = ENOEXEC; 232 goto dealloc_and_fail; 233 } 234 235 nscns = fhdr->f_nscns; 236 237 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 238 /* 239 * XXX -- just fail. I'm so lazy. 240 */ 241 error = ENOEXEC; 242 goto dealloc_and_fail; 243 } 244 245 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 246 247 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 248 + sizeof(struct aouthdr)); 249 250 for (i = 0; i < nscns; i++) { 251 if (scns[i].s_flags & STYP_NOLOAD) 252 continue; 253 else if (scns[i].s_flags & STYP_TEXT) { 254 text_address = scns[i].s_vaddr; 255 text_size = scns[i].s_size; 256 text_offset = scns[i].s_scnptr; 257 } 258 else if (scns[i].s_flags & STYP_DATA) { 259 data_address = scns[i].s_vaddr; 260 data_size = scns[i].s_size; 261 data_offset = scns[i].s_scnptr; 262 } else if (scns[i].s_flags & STYP_BSS) { 263 bss_size = scns[i].s_size; 264 } 265 } 266 267 if ((error = load_coff_section(vmspace, vp, text_offset, 268 (caddr_t)(void *)(uintptr_t)text_address, 269 text_size, text_size, 270 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 271 goto dealloc_and_fail; 272 } 273 if ((error = load_coff_section(vmspace, vp, data_offset, 274 (caddr_t)(void *)(uintptr_t)data_address, 275 data_size + bss_size, data_size, 276 VM_PROT_ALL)) != 0) { 277 goto dealloc_and_fail; 278 } 279 280 error = 0; 281 282 dealloc_and_fail: 283 if (vm_map_remove(exec_map, 284 (vm_offset_t) ptr, 285 (vm_offset_t) ptr + PAGE_SIZE)) 286 panic("%s vm_map_remove failed", __func__); 287 288 fail: 289 VOP_UNLOCK(vp, 0); 290 unlocked_fail: 291 NDFREE(&nd, NDF_ONLY_PNBUF); 292 vrele(nd.ni_vp); 293 return error; 294 } 295 296 static int 297 exec_coff_imgact(imgp) 298 struct image_params *imgp; 299 { 300 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header; 301 const struct aouthdr *ahdr; 302 const struct scnhdr *scns; 303 int i; 304 struct vmspace *vmspace; 305 int nscns; 306 int error; 307 unsigned long text_offset = 0, text_address = 0, text_size = 0; 308 unsigned long data_offset = 0, data_address = 0, data_size = 0; 309 unsigned long bss_size = 0; 310 vm_offset_t hole; 311 312 if (fhdr->f_magic != I386_COFF || 313 !(fhdr->f_flags & F_EXEC)) { 314 315 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 316 return -1; 317 } 318 319 nscns = fhdr->f_nscns; 320 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 321 /* 322 * For now, return an error -- need to be able to 323 * read in all of the section structures. 324 */ 325 326 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 327 return -1; 328 } 329 330 ahdr = (const struct aouthdr*) 331 ((const char*)(imgp->image_header) + sizeof(struct filehdr)); 332 imgp->entry_addr = ahdr->entry; 333 334 scns = (const struct scnhdr*) 335 ((const char*)(imgp->image_header) + sizeof(struct filehdr) + 336 sizeof(struct aouthdr)); 337 338 VOP_UNLOCK(imgp->vp, 0); 339 340 error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec); 341 if (error) 342 goto fail; 343 vmspace = imgp->proc->p_vmspace; 344 345 for (i = 0; i < nscns; i++) { 346 347 DPRINTF(("i = %d, s_name = %s, s_vaddr = %08lx, " 348 "s_scnptr = %ld s_size = %lx\n", i, scns[i].s_name, 349 scns[i].s_vaddr, scns[i].s_scnptr, scns[i].s_size)); 350 if (scns[i].s_flags & STYP_NOLOAD) { 351 /* 352 * A section that is not loaded, for whatever 353 * reason. It takes precedance over other flag 354 * bits... 355 */ 356 continue; 357 } else if (scns[i].s_flags & STYP_TEXT) { 358 text_address = scns[i].s_vaddr; 359 text_size = scns[i].s_size; 360 text_offset = scns[i].s_scnptr; 361 } else if (scns[i].s_flags & STYP_DATA) { 362 /* .data section */ 363 data_address = scns[i].s_vaddr; 364 data_size = scns[i].s_size; 365 data_offset = scns[i].s_scnptr; 366 } else if (scns[i].s_flags & STYP_BSS) { 367 /* .bss section */ 368 bss_size = scns[i].s_size; 369 } else if (scns[i].s_flags & STYP_LIB) { 370 char *buf = 0; 371 int foff = trunc_page(scns[i].s_scnptr); 372 int off = scns[i].s_scnptr - foff; 373 int len = round_page(scns[i].s_size + PAGE_SIZE); 374 int j; 375 376 if ((error = vm_mmap(exec_map, 377 (vm_offset_t *) &buf, 378 len, 379 VM_PROT_READ, 380 VM_PROT_READ, 381 MAP_SHARED, 382 OBJT_VNODE, 383 imgp->vp, 384 foff)) != 0) { 385 error = ENOEXEC; 386 goto fail; 387 } 388 if(scns[i].s_size) { 389 char *libbuf; 390 int emul_path_len = strlen(ibcs2_emul_path); 391 392 libbuf = malloc(MAXPATHLEN + emul_path_len, 393 M_TEMP, M_WAITOK); 394 strcpy(libbuf, ibcs2_emul_path); 395 396 for (j = off; j < scns[i].s_size + off;) { 397 long stroff, nextoff; 398 char *libname; 399 400 nextoff = 4 * *(long *)(buf + j); 401 stroff = 4 * *(long *)(buf + j + sizeof(long)); 402 403 libname = buf + j + stroff; 404 j += nextoff; 405 406 DPRINTF(("%s(%d): shared library %s\n", 407 __FILE__, __LINE__, libname)); 408 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN); 409 error = coff_load_file( 410 FIRST_THREAD_IN_PROC(imgp->proc), libbuf); 411 if (error) 412 error = coff_load_file( 413 FIRST_THREAD_IN_PROC(imgp->proc), 414 libname); 415 if (error) { 416 printf( 417 "error %d loading coff shared library %s\n", 418 error, libname); 419 break; 420 } 421 } 422 free(libbuf, M_TEMP); 423 } 424 if (vm_map_remove(exec_map, 425 (vm_offset_t) buf, 426 (vm_offset_t) buf + len)) 427 panic("exec_coff_imgact vm_map_remove failed"); 428 if (error) 429 goto fail; 430 } 431 } 432 /* 433 * Map in .text now 434 */ 435 436 DPRINTF(("%s(%d): load_coff_section(vmspace, " 437 "imgp->vp, %08lx, %08lx, 0x%lx, 0x%lx, 0x%x)\n", 438 __FILE__, __LINE__, text_offset, text_address, 439 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE)); 440 if ((error = load_coff_section(vmspace, imgp->vp, 441 text_offset, 442 (caddr_t)(void *)(uintptr_t)text_address, 443 text_size, text_size, 444 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 445 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 446 goto fail; 447 } 448 /* 449 * Map in .data and .bss now 450 */ 451 452 453 DPRINTF(("%s(%d): load_coff_section(vmspace, " 454 "imgp->vp, 0x%08lx, 0x%08lx, 0x%lx, 0x%lx, 0x%x)\n", 455 __FILE__, __LINE__, data_offset, data_address, 456 data_size + bss_size, data_size, VM_PROT_ALL)); 457 if ((error = load_coff_section(vmspace, imgp->vp, 458 data_offset, 459 (caddr_t)(void *)(uintptr_t)data_address, 460 data_size + bss_size, data_size, 461 VM_PROT_ALL)) != 0) { 462 463 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 464 goto fail; 465 } 466 467 imgp->interpreted = 0; 468 imgp->proc->p_sysent = &ibcs2_svr3_sysvec; 469 470 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 471 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 472 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address; 473 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address; 474 475 hole = trunc_page((vm_offset_t)vmspace->vm_daddr + 476 ctob(vmspace->vm_dsize)); 477 478 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%jx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", 479 __FILE__, __LINE__, (uintmax_t)hole)); 480 DPRINTF(("imgact: error = %d\n", error)); 481 482 vm_map_find(&vmspace->vm_map, NULL, 0, 483 (vm_offset_t *)&hole, PAGE_SIZE, VMFS_NO_SPACE, 484 VM_PROT_ALL, VM_PROT_ALL, 0); 485 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%p end = 0x%p\n", 486 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 487 ctob(vmspace->vm_dsize) + vmspace->vm_daddr )); 488 DPRINTF(("%s(%d): returning %d!\n", __FILE__, __LINE__, error)); 489 490 fail: 491 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 492 493 return (error); 494 } 495 496 /* 497 * Tell kern_execve.c about it, with a little help from the linker. 498 */ 499 static struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 500 EXEC_SET(coff, coff_execsw);
Cache object: d48d8ea67f978f0411045ed77e1b6c02
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