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 * $FreeBSD$ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/mman.h> 35 #include <sys/imgact.h> 36 #include <sys/kernel.h> 37 #include <sys/fcntl.h> 38 #include <sys/malloc.h> 39 #include <sys/mount.h> 40 #include <sys/namei.h> 41 #include <sys/vnode.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 #include <vm/vm_map.h> 46 #include <vm/vm_kern.h> 47 #include <vm/vm_extern.h> 48 #include <vm/vm_zone.h> 49 50 #include <i386/ibcs2/coff.h> 51 #include <i386/ibcs2/ibcs2_util.h> 52 53 extern struct sysentvec ibcs2_svr3_sysvec; 54 55 static int coff_load_file __P((struct proc *p, char *name)); 56 static int exec_coff_imgact __P((struct image_params *imgp)); 57 58 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)); 59 60 static int 61 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, 62 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) 63 { 64 size_t map_len; 65 vm_offset_t map_offset; 66 vm_offset_t map_addr; 67 int error; 68 unsigned char *data_buf = 0; 69 size_t copy_len; 70 71 map_offset = trunc_page(offset); 72 map_addr = trunc_page((vm_offset_t)vmaddr); 73 74 if (memsz > filsz) { 75 /* 76 * We have the stupid situation that 77 * the section is longer than it is on file, 78 * which means it has zero-filled areas, and 79 * we have to work for it. Stupid iBCS! 80 */ 81 map_len = trunc_page(offset + filsz) - trunc_page(map_offset); 82 } else { 83 /* 84 * The only stuff we care about is on disk, and we 85 * don't care if we map in more than is really there. 86 */ 87 map_len = round_page(offset + filsz) - trunc_page(map_offset); 88 } 89 90 DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, " 91 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n", 92 __FILE__, __LINE__, map_addr, map_len, prot, map_offset)); 93 94 if ((error = vm_mmap(&vmspace->vm_map, 95 &map_addr, 96 map_len, 97 prot, 98 VM_PROT_ALL, 99 MAP_PRIVATE | MAP_FIXED, 100 (caddr_t) vp, 101 map_offset)) != 0) 102 return error; 103 104 if (memsz == filsz) { 105 /* We're done! */ 106 return 0; 107 } 108 109 /* 110 * Now we have screwball stuff, to accomodate stupid COFF. 111 * We have to map the remaining bit of the file into the kernel's 112 * memory map, allocate some anonymous memory, copy that last 113 * bit into it, and then we're done. *sigh* 114 * For clean-up reasons, we actally map in the file last. 115 */ 116 117 copy_len = (offset + filsz) - trunc_page(offset + filsz); 118 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 119 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 120 121 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)); 122 123 if (map_len != 0) { 124 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr, 125 map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 126 if (error) 127 return error; 128 } 129 130 if ((error = vm_mmap(kernel_map, 131 (vm_offset_t *) &data_buf, 132 PAGE_SIZE, 133 VM_PROT_READ, 134 VM_PROT_READ, 135 0, 136 (caddr_t) vp, 137 trunc_page(offset + filsz))) != 0) 138 return error; 139 140 error = copyout(data_buf, (caddr_t) map_addr, copy_len); 141 142 if (vm_map_remove(kernel_map, 143 (vm_offset_t) data_buf, 144 (vm_offset_t) data_buf + PAGE_SIZE)) 145 panic("load_coff_section vm_map_remove failed"); 146 147 return error; 148 } 149 150 static int 151 coff_load_file(struct proc *p, char *name) 152 { 153 struct vmspace *vmspace = p->p_vmspace; 154 int error; 155 struct nameidata nd; 156 struct vnode *vp; 157 struct vattr attr; 158 struct filehdr *fhdr; 159 struct aouthdr *ahdr; 160 struct scnhdr *scns; 161 char *ptr = 0; 162 int nscns; 163 unsigned long text_offset = 0, text_address = 0, text_size = 0; 164 unsigned long data_offset = 0, data_address = 0, data_size = 0; 165 unsigned long bss_size = 0; 166 int i; 167 168 /* XXX use of 'curproc' should be 'p'?*/ 169 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, curproc); 170 171 error = namei(&nd); 172 if (error) 173 return error; 174 175 vp = nd.ni_vp; 176 if (vp == NULL) 177 return ENOEXEC; 178 179 if (vp->v_writecount) { 180 error = ETXTBSY; 181 goto fail; 182 } 183 184 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 185 goto fail; 186 187 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) 188 || ((attr.va_mode & 0111) == 0) 189 || (attr.va_type != VREG)) 190 goto fail; 191 192 if (attr.va_size == 0) { 193 error = ENOEXEC; 194 goto fail; 195 } 196 197 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 198 goto fail; 199 200 if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0) 201 goto fail; 202 203 /* 204 * Lose the lock on the vnode. It's no longer needed, and must not 205 * exist for the pagefault paging to work below. 206 */ 207 VOP_UNLOCK(vp, 0, p); 208 209 if ((error = vm_mmap(kernel_map, 210 (vm_offset_t *) &ptr, 211 PAGE_SIZE, 212 VM_PROT_READ, 213 VM_PROT_READ, 214 0, 215 (caddr_t) vp, 216 0)) != 0) 217 goto unlocked_fail; 218 219 fhdr = (struct filehdr *)ptr; 220 221 if (fhdr->f_magic != I386_COFF) { 222 error = ENOEXEC; 223 goto dealloc_and_fail; 224 } 225 226 nscns = fhdr->f_nscns; 227 228 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 229 /* 230 * XXX -- just fail. I'm so lazy. 231 */ 232 error = ENOEXEC; 233 goto dealloc_and_fail; 234 } 235 236 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 237 238 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 239 + sizeof(struct aouthdr)); 240 241 for (i = 0; i < nscns; i++) { 242 if (scns[i].s_flags & STYP_NOLOAD) 243 continue; 244 else if (scns[i].s_flags & STYP_TEXT) { 245 text_address = scns[i].s_vaddr; 246 text_size = scns[i].s_size; 247 text_offset = scns[i].s_scnptr; 248 } 249 else if (scns[i].s_flags & STYP_DATA) { 250 data_address = scns[i].s_vaddr; 251 data_size = scns[i].s_size; 252 data_offset = scns[i].s_scnptr; 253 } else if (scns[i].s_flags & STYP_BSS) { 254 bss_size = scns[i].s_size; 255 } 256 } 257 258 if ((error = load_coff_section(vmspace, vp, text_offset, 259 (caddr_t)(void *)(uintptr_t)text_address, 260 text_size, text_size, 261 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 262 goto dealloc_and_fail; 263 } 264 if ((error = load_coff_section(vmspace, vp, data_offset, 265 (caddr_t)(void *)(uintptr_t)data_address, 266 data_size + bss_size, data_size, 267 VM_PROT_ALL)) != 0) { 268 goto dealloc_and_fail; 269 } 270 271 error = 0; 272 273 dealloc_and_fail: 274 if (vm_map_remove(kernel_map, 275 (vm_offset_t) ptr, 276 (vm_offset_t) ptr + PAGE_SIZE)) 277 panic(__FUNCTION__ " vm_map_remove failed"); 278 279 fail: 280 VOP_UNLOCK(vp, 0, p); 281 unlocked_fail: 282 NDFREE(&nd, NDF_ONLY_PNBUF); 283 vrele(nd.ni_vp); 284 return error; 285 } 286 287 static int 288 exec_coff_imgact(imgp) 289 struct image_params *imgp; 290 { 291 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header; 292 const struct aouthdr *ahdr; 293 const struct scnhdr *scns; 294 int i; 295 struct vmspace *vmspace; 296 int nscns; 297 int error; 298 unsigned long text_offset = 0, text_address = 0, text_size = 0; 299 unsigned long data_offset = 0, data_address = 0, data_size = 0; 300 unsigned long bss_size = 0; 301 caddr_t hole; 302 303 if (fhdr->f_magic != I386_COFF || 304 !(fhdr->f_flags & F_EXEC)) { 305 306 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 307 return -1; 308 } 309 310 nscns = fhdr->f_nscns; 311 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 312 /* 313 * For now, return an error -- need to be able to 314 * read in all of the section structures. 315 */ 316 317 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 318 return -1; 319 } 320 321 ahdr = (const struct aouthdr*) 322 ((const char*)(imgp->image_header) + sizeof(struct filehdr)); 323 imgp->entry_addr = ahdr->entry; 324 325 scns = (const struct scnhdr*) 326 ((const char*)(imgp->image_header) + sizeof(struct filehdr) + 327 sizeof(struct aouthdr)); 328 329 if ((error = exec_extract_strings(imgp)) != 0) { 330 DPRINTF(("%s(%d): return %d\n", __FILE__, __LINE__, error)); 331 return error; 332 } 333 334 exec_new_vmspace(imgp); 335 vmspace = imgp->proc->p_vmspace; 336 337 for (i = 0; i < nscns; i++) { 338 339 DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, " 340 "scns[i].s_scnptr = %d\n", i, scns[i].s_name, 341 scns[i].s_vaddr, scns[i].s_scnptr)); 342 if (scns[i].s_flags & STYP_NOLOAD) { 343 /* 344 * A section that is not loaded, for whatever 345 * reason. It takes precedance over other flag 346 * bits... 347 */ 348 continue; 349 } else if (scns[i].s_flags & STYP_TEXT) { 350 text_address = scns[i].s_vaddr; 351 text_size = scns[i].s_size; 352 text_offset = scns[i].s_scnptr; 353 } else if (scns[i].s_flags & STYP_DATA) { 354 /* .data section */ 355 data_address = scns[i].s_vaddr; 356 data_size = scns[i].s_size; 357 data_offset = scns[i].s_scnptr; 358 } else if (scns[i].s_flags & STYP_BSS) { 359 /* .bss section */ 360 bss_size = scns[i].s_size; 361 } else if (scns[i].s_flags & STYP_LIB) { 362 char *buf = 0; 363 int foff = trunc_page(scns[i].s_scnptr); 364 int off = scns[i].s_scnptr - foff; 365 int len = round_page(scns[i].s_size + PAGE_SIZE); 366 int j; 367 368 if ((error = vm_mmap(kernel_map, 369 (vm_offset_t *) &buf, 370 len, 371 VM_PROT_READ, 372 VM_PROT_READ, 373 0, 374 (caddr_t) imgp->vp, 375 foff)) != 0) { 376 return ENOEXEC; 377 } 378 if(scns[i].s_size) { 379 char *libbuf; 380 int emul_path_len = strlen(ibcs2_emul_path); 381 382 libbuf = malloc(MAXPATHLEN + emul_path_len, 383 M_TEMP, M_WAITOK); 384 strcpy(libbuf, ibcs2_emul_path); 385 386 for (j = off; j < scns[i].s_size + off; j++) { 387 char *libname; 388 389 libname = buf + j + 4 * *(long*)(buf + j + 4); 390 j += 4* *(long*)(buf + j); 391 392 DPRINTF(("%s(%d): shared library %s\n", 393 __FILE__, __LINE__, libname)); 394 strcpy(&libbuf[emul_path_len], libname); 395 error = coff_load_file(imgp->proc, libbuf); 396 if (error) 397 error = coff_load_file(imgp->proc, 398 libname); 399 if (error) 400 break; 401 } 402 free(libbuf, M_TEMP); 403 } 404 if (vm_map_remove(kernel_map, 405 (vm_offset_t) buf, 406 (vm_offset_t) buf + len)) 407 panic("exec_coff_imgact vm_map_remove failed"); 408 if (error) 409 return error; 410 } 411 } 412 /* 413 * Map in .text now 414 */ 415 416 DPRINTF(("%s(%d): load_coff_section(vmspace, " 417 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n", 418 __FILE__, __LINE__, text_offset, text_address, 419 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE)); 420 if ((error = load_coff_section(vmspace, imgp->vp, 421 text_offset, 422 (caddr_t)(void *)(uintptr_t)text_address, 423 text_size, text_size, 424 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 425 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 426 return error; 427 } 428 /* 429 * Map in .data and .bss now 430 */ 431 432 433 DPRINTF(("%s(%d): load_coff_section(vmspace, " 434 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n", 435 __FILE__, __LINE__, data_offset, data_address, 436 data_size + bss_size, data_size, VM_PROT_ALL)); 437 if ((error = load_coff_section(vmspace, imgp->vp, 438 data_offset, 439 (caddr_t)(void *)(uintptr_t)data_address, 440 data_size + bss_size, data_size, 441 VM_PROT_ALL)) != 0) { 442 443 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 444 return error; 445 } 446 447 imgp->interpreted = 0; 448 imgp->proc->p_sysent = &ibcs2_svr3_sysvec; 449 450 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 451 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 452 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address; 453 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address; 454 455 hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize); 456 457 458 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", 459 __FILE__, __LINE__, hole)); 460 DPRINTF(("imgact: error = %d\n", error)); 461 462 error = vm_map_find(&vmspace->vm_map, NULL, 0, 463 (vm_offset_t *) &hole, PAGE_SIZE, FALSE, 464 VM_PROT_ALL, VM_PROT_ALL, 0); 465 466 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n", 467 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 468 ctob(vmspace->vm_dsize) + vmspace->vm_daddr )); 469 DPRINTF(("%s(%d): returning successfully!\n", __FILE__, __LINE__)); 470 471 /* Indicate that this file should not be modified */ 472 imgp->vp->v_flag |= VTEXT; 473 return 0; 474 } 475 476 /* 477 * Tell kern_execve.c about it, with a little help from the linker. 478 */ 479 static struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 480 EXEC_SET(coff, coff_execsw);
Cache object: 5b7979df41355a34848aecd46ee53c75
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