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/vm_prot.h> 45 #include <vm/pmap.h> 46 #include <vm/vm_map.h> 47 #include <vm/vm_kern.h> 48 #include <vm/vm_extern.h> 49 #include <vm/vm_zone.h> 50 51 #include <i386/ibcs2/coff.h> 52 #include <i386/ibcs2/ibcs2_util.h> 53 54 extern struct sysentvec ibcs2_svr3_sysvec; 55 56 static int coff_load_file __P((struct proc *p, char *name)); 57 static int exec_coff_imgact __P((struct image_params *imgp)); 58 59 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)); 60 61 static int 62 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, 63 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) 64 { 65 size_t map_len; 66 vm_offset_t map_offset; 67 vm_offset_t map_addr; 68 int error; 69 unsigned char *data_buf = 0; 70 size_t copy_len; 71 72 map_offset = trunc_page(offset); 73 map_addr = trunc_page((vm_offset_t)vmaddr); 74 75 if (memsz > filsz) { 76 /* 77 * We have the stupid situation that 78 * the section is longer than it is on file, 79 * which means it has zero-filled areas, and 80 * we have to work for it. Stupid iBCS! 81 */ 82 map_len = trunc_page(offset + filsz) - trunc_page(map_offset); 83 } else { 84 /* 85 * The only stuff we care about is on disk, and we 86 * don't care if we map in more than is really there. 87 */ 88 map_len = round_page(offset + filsz) - trunc_page(map_offset); 89 } 90 91 DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, " 92 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n", 93 __FILE__, __LINE__, map_addr, map_len, prot, map_offset)); 94 95 if (error = vm_mmap(&vmspace->vm_map, 96 &map_addr, 97 map_len, 98 prot, 99 VM_PROT_ALL, 100 MAP_PRIVATE | MAP_FIXED, 101 (caddr_t) vp, 102 map_offset)) 103 return error; 104 105 if (memsz == filsz) { 106 /* We're done! */ 107 return 0; 108 } 109 110 /* 111 * Now we have screwball stuff, to accomodate stupid COFF. 112 * We have to map the remaining bit of the file into the kernel's 113 * memory map, allocate some anonymous memory, copy that last 114 * bit into it, and then we're done. *sigh* 115 * For clean-up reasons, we actally map in the file last. 116 */ 117 118 copy_len = (offset + filsz) - trunc_page(offset + filsz); 119 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 120 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 121 122 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)); 123 124 if (map_len != 0) { 125 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr, 126 map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 127 if (error) 128 return error; 129 } 130 131 if (error = vm_mmap(kernel_map, 132 (vm_offset_t *) &data_buf, 133 PAGE_SIZE, 134 VM_PROT_READ, 135 VM_PROT_READ, 136 0, 137 (caddr_t) vp, 138 trunc_page(offset + filsz))) 139 return error; 140 141 error = copyout(data_buf, (caddr_t) map_addr, copy_len); 142 143 if (vm_map_remove(kernel_map, 144 (vm_offset_t) data_buf, 145 (vm_offset_t) data_buf + PAGE_SIZE)) 146 panic("load_coff_section vm_map_remove failed"); 147 148 return error; 149 } 150 151 static int 152 coff_load_file(struct proc *p, char *name) 153 { 154 struct vmspace *vmspace = p->p_vmspace; 155 int error; 156 struct nameidata nd; 157 struct vnode *vp; 158 struct vattr attr; 159 struct filehdr *fhdr; 160 struct aouthdr *ahdr; 161 struct scnhdr *scns; 162 char *ptr = 0; 163 int nscns; 164 unsigned long text_offset = 0, text_address = 0, text_size = 0; 165 unsigned long data_offset = 0, data_address = 0, data_size = 0; 166 unsigned long bss_size = 0; 167 int i; 168 169 /* XXX use of 'curproc' should be 'p'?*/ 170 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, curproc); 171 172 error = namei(&nd); 173 if (error) 174 return error; 175 176 vp = nd.ni_vp; 177 if (vp == NULL) 178 return ENOEXEC; 179 180 if (vp->v_writecount) { 181 error = ETXTBSY; 182 goto fail; 183 } 184 185 if (error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) 186 goto fail; 187 188 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) 189 || ((attr.va_mode & 0111) == 0) 190 || (attr.va_type != VREG)) 191 goto fail; 192 193 if (attr.va_size == 0) { 194 error = ENOEXEC; 195 goto fail; 196 } 197 198 if (error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) 199 goto fail; 200 201 if (error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) 202 goto fail; 203 204 /* 205 * Lose the lock on the vnode. It's no longer needed, and must not 206 * exist for the pagefault paging to work below. 207 */ 208 VOP_UNLOCK(vp, 0, p); 209 210 if (error = vm_mmap(kernel_map, 211 (vm_offset_t *) &ptr, 212 PAGE_SIZE, 213 VM_PROT_READ, 214 VM_PROT_READ, 215 0, 216 (caddr_t) vp, 217 0)) 218 goto fail; 219 220 fhdr = (struct filehdr *)ptr; 221 222 if (fhdr->f_magic != I386_COFF) { 223 error = ENOEXEC; 224 goto dealloc_and_fail; 225 } 226 227 nscns = fhdr->f_nscns; 228 229 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 230 /* 231 * XXX -- just fail. I'm so lazy. 232 */ 233 error = ENOEXEC; 234 goto dealloc_and_fail; 235 } 236 237 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 238 239 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 240 + sizeof(struct aouthdr)); 241 242 for (i = 0; i < nscns; i++) { 243 if (scns[i].s_flags & STYP_NOLOAD) 244 continue; 245 else if (scns[i].s_flags & STYP_TEXT) { 246 text_address = scns[i].s_vaddr; 247 text_size = scns[i].s_size; 248 text_offset = scns[i].s_scnptr; 249 } 250 else if (scns[i].s_flags & STYP_DATA) { 251 data_address = scns[i].s_vaddr; 252 data_size = scns[i].s_size; 253 data_offset = scns[i].s_scnptr; 254 } else if (scns[i].s_flags & STYP_BSS) { 255 bss_size = scns[i].s_size; 256 } 257 } 258 259 if (error = load_coff_section(vmspace, vp, text_offset, 260 (caddr_t)(void *)(uintptr_t)text_address, 261 text_size, text_size, 262 VM_PROT_READ | VM_PROT_EXECUTE)) { 263 goto dealloc_and_fail; 264 } 265 if (error = load_coff_section(vmspace, vp, data_offset, 266 (caddr_t)(void *)(uintptr_t)data_address, 267 data_size + bss_size, data_size, 268 VM_PROT_ALL)) { 269 goto dealloc_and_fail; 270 } 271 272 error = 0; 273 274 dealloc_and_fail: 275 if (vm_map_remove(kernel_map, 276 (vm_offset_t) ptr, 277 (vm_offset_t) ptr + PAGE_SIZE)) 278 panic(__FUNCTION__ " vm_map_remove failed"); 279 280 fail: 281 vput(nd.ni_vp); 282 zfree(namei_zone, nd.ni_cnd.cn_pnbuf); 283 return error; 284 } 285 286 static int 287 exec_coff_imgact(imgp) 288 struct image_params *imgp; 289 { 290 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header; 291 const struct aouthdr *ahdr; 292 const struct scnhdr *scns; 293 int i; 294 struct vmspace *vmspace; 295 int nscns; 296 int error; 297 unsigned long text_offset = 0, text_address = 0, text_size = 0; 298 unsigned long data_offset = 0, data_address = 0, data_size = 0; 299 unsigned long bss_size = 0; 300 caddr_t hole; 301 302 if (fhdr->f_magic != I386_COFF || 303 !(fhdr->f_flags & F_EXEC)) { 304 305 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 306 return -1; 307 } 308 309 nscns = fhdr->f_nscns; 310 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 311 /* 312 * For now, return an error -- need to be able to 313 * read in all of the section structures. 314 */ 315 316 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 317 return -1; 318 } 319 320 ahdr = (const struct aouthdr*) 321 ((const char*)(imgp->image_header) + sizeof(struct filehdr)); 322 imgp->entry_addr = ahdr->entry; 323 324 scns = (const struct scnhdr*) 325 ((const char*)(imgp->image_header) + sizeof(struct filehdr) + 326 sizeof(struct aouthdr)); 327 328 if (error = exec_extract_strings(imgp)) { 329 DPRINTF(("%s(%d): return %d\n", __FILE__, __LINE__, error)); 330 return error; 331 } 332 333 exec_new_vmspace(imgp); 334 vmspace = imgp->proc->p_vmspace; 335 336 for (i = 0; i < nscns; i++) { 337 338 DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, " 339 "scns[i].s_scnptr = %d\n", i, scns[i].s_name, 340 scns[i].s_vaddr, scns[i].s_scnptr)); 341 if (scns[i].s_flags & STYP_NOLOAD) { 342 /* 343 * A section that is not loaded, for whatever 344 * reason. It takes precedance over other flag 345 * bits... 346 */ 347 continue; 348 } else if (scns[i].s_flags & STYP_TEXT) { 349 text_address = scns[i].s_vaddr; 350 text_size = scns[i].s_size; 351 text_offset = scns[i].s_scnptr; 352 } else if (scns[i].s_flags & STYP_DATA) { 353 /* .data section */ 354 data_address = scns[i].s_vaddr; 355 data_size = scns[i].s_size; 356 data_offset = scns[i].s_scnptr; 357 } else if (scns[i].s_flags & STYP_BSS) { 358 /* .bss section */ 359 bss_size = scns[i].s_size; 360 } else if (scns[i].s_flags & STYP_LIB) { 361 char *buf = 0; 362 int foff = trunc_page(scns[i].s_scnptr); 363 int off = scns[i].s_scnptr - foff; 364 int len = round_page(scns[i].s_size + PAGE_SIZE); 365 int j; 366 367 if (error = vm_mmap(kernel_map, 368 (vm_offset_t *) &buf, 369 len, 370 VM_PROT_READ, 371 VM_PROT_READ, 372 0, 373 (caddr_t) imgp->vp, 374 foff)) { 375 return ENOEXEC; 376 } 377 if(scns[i].s_size) { 378 char *libbuf; 379 int emul_path_len = strlen(ibcs2_emul_path); 380 381 libbuf = malloc(MAXPATHLEN + emul_path_len, 382 M_TEMP, M_WAITOK); 383 strcpy(libbuf, ibcs2_emul_path); 384 385 for (j = off; j < scns[i].s_size + off; j++) { 386 char *libname; 387 388 libname = buf + j + 4 * *(long*)(buf + j + 4); 389 j += 4* *(long*)(buf + j); 390 391 DPRINTF(("%s(%d): shared library %s\n", 392 __FILE__, __LINE__, libname)); 393 strcpy(&libbuf[emul_path_len], libname); 394 error = coff_load_file(imgp->proc, libbuf); 395 if (error) 396 error = coff_load_file(imgp->proc, 397 libname); 398 if (error) 399 break; 400 } 401 free(libbuf, M_TEMP); 402 } 403 if (vm_map_remove(kernel_map, 404 (vm_offset_t) buf, 405 (vm_offset_t) buf + len)) 406 panic("exec_coff_imgact vm_map_remove failed"); 407 if (error) 408 return error; 409 } 410 } 411 /* 412 * Map in .text now 413 */ 414 415 DPRINTF(("%s(%d): load_coff_section(vmspace, " 416 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n", 417 __FILE__, __LINE__, text_offset, text_address, 418 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE)); 419 if (error = load_coff_section(vmspace, imgp->vp, 420 text_offset, 421 (caddr_t)(void *)(uintptr_t)text_address, 422 text_size, text_size, 423 VM_PROT_READ | VM_PROT_EXECUTE)) { 424 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 425 return error; 426 } 427 /* 428 * Map in .data and .bss now 429 */ 430 431 432 DPRINTF(("%s(%d): load_coff_section(vmspace, " 433 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n", 434 __FILE__, __LINE__, data_offset, data_address, 435 data_size + bss_size, data_size, VM_PROT_ALL)); 436 if (error = load_coff_section(vmspace, imgp->vp, 437 data_offset, 438 (caddr_t)(void *)(uintptr_t)data_address, 439 data_size + bss_size, data_size, 440 VM_PROT_ALL)) { 441 442 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 443 return error; 444 } 445 446 imgp->interpreted = 0; 447 imgp->proc->p_sysent = &ibcs2_svr3_sysvec; 448 449 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 450 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 451 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address; 452 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address; 453 454 hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize); 455 456 457 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", 458 __FILE__, __LINE__, hole)); 459 DPRINTF(("imgact: error = %d\n", error)); 460 461 error = vm_map_find(&vmspace->vm_map, NULL, 0, 462 (vm_offset_t *) &hole, PAGE_SIZE, FALSE, 463 VM_PROT_ALL, VM_PROT_ALL, 0); 464 465 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n", 466 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 467 ctob(vmspace->vm_dsize) + vmspace->vm_daddr )); 468 DPRINTF(("%s(%d): returning successfully!\n", __FILE__, __LINE__)); 469 470 /* Indicate that this file should not be modified */ 471 imgp->vp->v_flag |= VTEXT; 472 return 0; 473 } 474 475 /* 476 * Tell kern_execve.c about it, with a little help from the linker. 477 * Since `const' objects end up in the text segment, TEXT_SET is the 478 * correct directive to use. 479 */ 480 static const struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 481 EXEC_SET(coff, coff_execsw);
Cache object: 0862993f0e16e72aa66da9566442e02f
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