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/9.1/sys/i386/ibcs2/imgact_coff.c 232387 2012-03-02 11:32:47Z 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 kmem_free_wakeup(exec_map, (vm_offset_t)data_buf, PAGE_SIZE); 150 151 return error; 152 } 153 154 static int 155 coff_load_file(struct thread *td, char *name) 156 { 157 struct proc *p = td->td_proc; 158 struct vmspace *vmspace = p->p_vmspace; 159 int error; 160 struct nameidata nd; 161 struct vnode *vp; 162 struct vattr attr; 163 struct filehdr *fhdr; 164 struct aouthdr *ahdr; 165 struct scnhdr *scns; 166 char *ptr = 0; 167 int nscns; 168 unsigned long text_offset = 0, text_address = 0, text_size = 0; 169 unsigned long data_offset = 0, data_address = 0, data_size = 0; 170 unsigned long bss_size = 0; 171 int i; 172 173 NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME, 174 UIO_SYSSPACE, name, td); 175 176 error = namei(&nd); 177 if (error) 178 return error; 179 180 vp = nd.ni_vp; 181 if (vp == NULL) 182 return ENOEXEC; 183 184 if (vp->v_writecount) { 185 error = ETXTBSY; 186 goto fail; 187 } 188 189 if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0) 190 goto fail; 191 192 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) 193 || ((attr.va_mode & 0111) == 0) 194 || (attr.va_type != VREG)) 195 goto fail; 196 197 if (attr.va_size == 0) { 198 error = ENOEXEC; 199 goto fail; 200 } 201 202 if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0) 203 goto fail; 204 205 if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0) 206 goto fail; 207 208 /* 209 * Lose the lock on the vnode. It's no longer needed, and must not 210 * exist for the pagefault paging to work below. 211 */ 212 VOP_UNLOCK(vp, 0); 213 214 if ((error = vm_mmap(exec_map, 215 (vm_offset_t *) &ptr, 216 PAGE_SIZE, 217 VM_PROT_READ, 218 VM_PROT_READ, 219 0, 220 OBJT_VNODE, 221 vp, 222 0)) != 0) 223 goto unlocked_fail; 224 225 fhdr = (struct filehdr *)ptr; 226 227 if (fhdr->f_magic != I386_COFF) { 228 error = ENOEXEC; 229 goto dealloc_and_fail; 230 } 231 232 nscns = fhdr->f_nscns; 233 234 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 235 /* 236 * XXX -- just fail. I'm so lazy. 237 */ 238 error = ENOEXEC; 239 goto dealloc_and_fail; 240 } 241 242 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 243 244 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 245 + sizeof(struct aouthdr)); 246 247 for (i = 0; i < nscns; i++) { 248 if (scns[i].s_flags & STYP_NOLOAD) 249 continue; 250 else if (scns[i].s_flags & STYP_TEXT) { 251 text_address = scns[i].s_vaddr; 252 text_size = scns[i].s_size; 253 text_offset = scns[i].s_scnptr; 254 } 255 else if (scns[i].s_flags & STYP_DATA) { 256 data_address = scns[i].s_vaddr; 257 data_size = scns[i].s_size; 258 data_offset = scns[i].s_scnptr; 259 } else if (scns[i].s_flags & STYP_BSS) { 260 bss_size = scns[i].s_size; 261 } 262 } 263 264 if ((error = load_coff_section(vmspace, vp, text_offset, 265 (caddr_t)(void *)(uintptr_t)text_address, 266 text_size, text_size, 267 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 268 goto dealloc_and_fail; 269 } 270 if ((error = load_coff_section(vmspace, vp, data_offset, 271 (caddr_t)(void *)(uintptr_t)data_address, 272 data_size + bss_size, data_size, 273 VM_PROT_ALL)) != 0) { 274 goto dealloc_and_fail; 275 } 276 277 error = 0; 278 279 dealloc_and_fail: 280 kmem_free_wakeup(exec_map, (vm_offset_t)ptr, PAGE_SIZE); 281 fail: 282 VOP_UNLOCK(vp, 0); 283 unlocked_fail: 284 NDFREE(&nd, NDF_ONLY_PNBUF); 285 vrele(nd.ni_vp); 286 return error; 287 } 288 289 static int 290 exec_coff_imgact(imgp) 291 struct image_params *imgp; 292 { 293 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header; 294 const struct aouthdr *ahdr; 295 const struct scnhdr *scns; 296 int i; 297 struct vmspace *vmspace; 298 int nscns; 299 int error; 300 unsigned long text_offset = 0, text_address = 0, text_size = 0; 301 unsigned long data_offset = 0, data_address = 0, data_size = 0; 302 unsigned long bss_size = 0; 303 vm_offset_t hole; 304 305 if (fhdr->f_magic != I386_COFF || 306 !(fhdr->f_flags & F_EXEC)) { 307 308 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 309 return -1; 310 } 311 312 nscns = fhdr->f_nscns; 313 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 314 /* 315 * For now, return an error -- need to be able to 316 * read in all of the section structures. 317 */ 318 319 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 320 return -1; 321 } 322 323 ahdr = (const struct aouthdr*) 324 ((const char*)(imgp->image_header) + sizeof(struct filehdr)); 325 imgp->entry_addr = ahdr->entry; 326 327 scns = (const struct scnhdr*) 328 ((const char*)(imgp->image_header) + sizeof(struct filehdr) + 329 sizeof(struct aouthdr)); 330 331 VOP_UNLOCK(imgp->vp, 0); 332 333 error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec); 334 if (error) 335 goto fail; 336 vmspace = imgp->proc->p_vmspace; 337 338 for (i = 0; i < nscns; i++) { 339 340 DPRINTF(("i = %d, s_name = %s, s_vaddr = %08lx, " 341 "s_scnptr = %ld s_size = %lx\n", i, scns[i].s_name, 342 scns[i].s_vaddr, scns[i].s_scnptr, scns[i].s_size)); 343 if (scns[i].s_flags & STYP_NOLOAD) { 344 /* 345 * A section that is not loaded, for whatever 346 * reason. It takes precedance over other flag 347 * bits... 348 */ 349 continue; 350 } else if (scns[i].s_flags & STYP_TEXT) { 351 text_address = scns[i].s_vaddr; 352 text_size = scns[i].s_size; 353 text_offset = scns[i].s_scnptr; 354 } else if (scns[i].s_flags & STYP_DATA) { 355 /* .data section */ 356 data_address = scns[i].s_vaddr; 357 data_size = scns[i].s_size; 358 data_offset = scns[i].s_scnptr; 359 } else if (scns[i].s_flags & STYP_BSS) { 360 /* .bss section */ 361 bss_size = scns[i].s_size; 362 } else if (scns[i].s_flags & STYP_LIB) { 363 char *buf = 0; 364 int foff = trunc_page(scns[i].s_scnptr); 365 int off = scns[i].s_scnptr - foff; 366 int len = round_page(scns[i].s_size + PAGE_SIZE); 367 int j; 368 369 if ((error = vm_mmap(exec_map, 370 (vm_offset_t *) &buf, 371 len, 372 VM_PROT_READ, 373 VM_PROT_READ, 374 MAP_SHARED, 375 OBJT_VNODE, 376 imgp->vp, 377 foff)) != 0) { 378 error = ENOEXEC; 379 goto fail; 380 } 381 if(scns[i].s_size) { 382 char *libbuf; 383 int emul_path_len = strlen(ibcs2_emul_path); 384 385 libbuf = malloc(MAXPATHLEN + emul_path_len, 386 M_TEMP, M_WAITOK); 387 strcpy(libbuf, ibcs2_emul_path); 388 389 for (j = off; j < scns[i].s_size + off;) { 390 long stroff, nextoff; 391 char *libname; 392 393 nextoff = 4 * *(long *)(buf + j); 394 stroff = 4 * *(long *)(buf + j + sizeof(long)); 395 396 libname = buf + j + stroff; 397 j += nextoff; 398 399 DPRINTF(("%s(%d): shared library %s\n", 400 __FILE__, __LINE__, libname)); 401 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN); 402 error = coff_load_file( 403 FIRST_THREAD_IN_PROC(imgp->proc), libbuf); 404 if (error) 405 error = coff_load_file( 406 FIRST_THREAD_IN_PROC(imgp->proc), 407 libname); 408 if (error) { 409 printf( 410 "error %d loading coff shared library %s\n", 411 error, libname); 412 break; 413 } 414 } 415 free(libbuf, M_TEMP); 416 } 417 kmem_free_wakeup(exec_map, (vm_offset_t)buf, len); 418 if (error) 419 goto fail; 420 } 421 } 422 /* 423 * Map in .text now 424 */ 425 426 DPRINTF(("%s(%d): load_coff_section(vmspace, " 427 "imgp->vp, %08lx, %08lx, 0x%lx, 0x%lx, 0x%x)\n", 428 __FILE__, __LINE__, text_offset, text_address, 429 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE)); 430 if ((error = load_coff_section(vmspace, imgp->vp, 431 text_offset, 432 (caddr_t)(void *)(uintptr_t)text_address, 433 text_size, text_size, 434 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 435 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 436 goto fail; 437 } 438 /* 439 * Map in .data and .bss now 440 */ 441 442 443 DPRINTF(("%s(%d): load_coff_section(vmspace, " 444 "imgp->vp, 0x%08lx, 0x%08lx, 0x%lx, 0x%lx, 0x%x)\n", 445 __FILE__, __LINE__, data_offset, data_address, 446 data_size + bss_size, data_size, VM_PROT_ALL)); 447 if ((error = load_coff_section(vmspace, imgp->vp, 448 data_offset, 449 (caddr_t)(void *)(uintptr_t)data_address, 450 data_size + bss_size, data_size, 451 VM_PROT_ALL)) != 0) { 452 453 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 454 goto fail; 455 } 456 457 imgp->interpreted = 0; 458 imgp->proc->p_sysent = &ibcs2_svr3_sysvec; 459 460 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 461 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 462 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address; 463 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address; 464 465 hole = trunc_page((vm_offset_t)vmspace->vm_daddr + 466 ctob(vmspace->vm_dsize)); 467 468 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%jx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", 469 __FILE__, __LINE__, (uintmax_t)hole)); 470 DPRINTF(("imgact: error = %d\n", error)); 471 472 vm_map_find(&vmspace->vm_map, NULL, 0, 473 (vm_offset_t *)&hole, PAGE_SIZE, VMFS_NO_SPACE, 474 VM_PROT_ALL, VM_PROT_ALL, 0); 475 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%p end = 0x%p\n", 476 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 477 ctob(vmspace->vm_dsize) + vmspace->vm_daddr )); 478 DPRINTF(("%s(%d): returning %d!\n", __FILE__, __LINE__, error)); 479 480 fail: 481 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 482 483 return (error); 484 } 485 486 /* 487 * Tell kern_execve.c about it, with a little help from the linker. 488 */ 489 static struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 490 EXEC_SET(coff, coff_execsw);
Cache object: 31f114144629fd7e5a47adab3346eea3
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