imgact_coff.c revision 103128
1/*- 2 * Copyright (c) 1994 Sean Eric Fagan 3 * Copyright (c) 1994 S�ren 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 * $FreeBSD: head/sys/i386/ibcs2/imgact_coff.c 103128 2002-09-09 15:51:10Z robert $ 30 */ 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/fcntl.h> 35#include <sys/imgact.h> 36#include <sys/kernel.h> 37#include <sys/lock.h> 38#include <sys/malloc.h> 39#include <sys/mman.h> 40#include <sys/mount.h> 41#include <sys/namei.h> 42#include <sys/vnode.h> 43 44#include <vm/vm.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 50#include <i386/ibcs2/coff.h> 51#include <i386/ibcs2/ibcs2_util.h> 52 53MODULE_DEPEND(coff, ibcs2, 1, 1, 1); 54 55extern struct sysentvec ibcs2_svr3_sysvec; 56 57static int coff_load_file(struct thread *td, char *name); 58static int exec_coff_imgact(struct image_params *imgp); 59 60static 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); 61 62static int 63load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, 64 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) 65{ 66 size_t map_len; 67 vm_offset_t map_offset; 68 vm_offset_t map_addr; 69 int error; 70 unsigned char *data_buf = 0; 71 size_t copy_len; 72 73 map_offset = trunc_page(offset); 74 map_addr = trunc_page((vm_offset_t)vmaddr); 75 76 if (memsz > filsz) { 77 /* 78 * We have the stupid situation that 79 * the section is longer than it is on file, 80 * which means it has zero-filled areas, and 81 * we have to work for it. Stupid iBCS! 82 */ 83 map_len = trunc_page(offset + filsz) - trunc_page(map_offset); 84 } else { 85 /* 86 * The only stuff we care about is on disk, and we 87 * don't care if we map in more than is really there. 88 */ 89 map_len = round_page(offset + filsz) - trunc_page(map_offset); 90 } 91 92 DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, " 93 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n", 94 __FILE__, __LINE__, map_addr, map_len, prot, map_offset)); 95 96 if ((error = vm_mmap(&vmspace->vm_map, 97 &map_addr, 98 map_len, 99 prot, 100 VM_PROT_ALL, 101 MAP_PRIVATE | MAP_FIXED, 102 (caddr_t) vp, 103 map_offset)) != 0) 104 return error; 105 106 if (memsz == filsz) { 107 /* We're done! */ 108 return 0; 109 } 110 111 /* 112 * Now we have screwball stuff, to accomodate stupid COFF. 113 * We have to map the remaining bit of the file into the kernel's 114 * memory map, allocate some anonymous memory, copy that last 115 * bit into it, and then we're done. *sigh* 116 * For clean-up reasons, we actally map in the file last. 117 */ 118 119 copy_len = (offset + filsz) - trunc_page(offset + filsz); 120 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 121 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 122 123 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)); 124 125 if (map_len != 0) { 126 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr, 127 map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 128 if (error) 129 return error; 130 } 131 132 if ((error = vm_mmap(kernel_map, 133 (vm_offset_t *) &data_buf, 134 PAGE_SIZE, 135 VM_PROT_READ, 136 VM_PROT_READ, 137 0, 138 (caddr_t) vp, 139 trunc_page(offset + filsz))) != 0) 140 return error; 141 142 error = copyout(data_buf, (caddr_t) map_addr, copy_len); 143 144 if (vm_map_remove(kernel_map, 145 (vm_offset_t) data_buf, 146 (vm_offset_t) data_buf + PAGE_SIZE)) 147 panic("load_coff_section vm_map_remove failed"); 148 149 return error; 150} 151 152static int 153coff_load_file(struct thread *td, char *name) 154{ 155 struct proc *p = td->td_proc; 156 struct vmspace *vmspace = p->p_vmspace; 157 int error; 158 struct nameidata nd; 159 struct vnode *vp; 160 struct vattr attr; 161 struct filehdr *fhdr; 162 struct aouthdr *ahdr; 163 struct scnhdr *scns; 164 char *ptr = 0; 165 int nscns; 166 unsigned long text_offset = 0, text_address = 0, text_size = 0; 167 unsigned long data_offset = 0, data_address = 0, data_size = 0; 168 unsigned long bss_size = 0; 169 int i; 170 171 NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, td); 172 173 error = namei(&nd); 174 if (error) 175 return error; 176 177 vp = nd.ni_vp; 178 if (vp == NULL) 179 return ENOEXEC; 180 181 if (vp->v_writecount) { 182 error = ETXTBSY; 183 goto fail; 184 } 185 186 if ((error = VOP_GETATTR(vp, &attr, td->td_ucred, td)) != 0) 187 goto fail; 188 189 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) 190 || ((attr.va_mode & 0111) == 0) 191 || (attr.va_type != VREG)) 192 goto fail; 193 194 if (attr.va_size == 0) { 195 error = ENOEXEC; 196 goto fail; 197 } 198 199 if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0) 200 goto fail; 201 202 if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td)) != 0) 203 goto fail; 204 205 /* 206 * Lose the lock on the vnode. It's no longer needed, and must not 207 * exist for the pagefault paging to work below. 208 */ 209 VOP_UNLOCK(vp, 0, td); 210 211 if ((error = vm_mmap(kernel_map, 212 (vm_offset_t *) &ptr, 213 PAGE_SIZE, 214 VM_PROT_READ, 215 VM_PROT_READ, 216 0, 217 (caddr_t) vp, 218 0)) != 0) 219 goto unlocked_fail; 220 221 fhdr = (struct filehdr *)ptr; 222 223 if (fhdr->f_magic != I386_COFF) { 224 error = ENOEXEC; 225 goto dealloc_and_fail; 226 } 227 228 nscns = fhdr->f_nscns; 229 230 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 231 /* 232 * XXX -- just fail. I'm so lazy. 233 */ 234 error = ENOEXEC; 235 goto dealloc_and_fail; 236 } 237 238 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 239 240 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 241 + sizeof(struct aouthdr)); 242 243 for (i = 0; i < nscns; i++) { 244 if (scns[i].s_flags & STYP_NOLOAD) 245 continue; 246 else if (scns[i].s_flags & STYP_TEXT) { 247 text_address = scns[i].s_vaddr; 248 text_size = scns[i].s_size; 249 text_offset = scns[i].s_scnptr; 250 } 251 else if (scns[i].s_flags & STYP_DATA) { 252 data_address = scns[i].s_vaddr; 253 data_size = scns[i].s_size; 254 data_offset = scns[i].s_scnptr; 255 } else if (scns[i].s_flags & STYP_BSS) { 256 bss_size = scns[i].s_size; 257 } 258 } 259 260 if ((error = load_coff_section(vmspace, vp, text_offset, 261 (caddr_t)(void *)(uintptr_t)text_address, 262 text_size, text_size, 263 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 264 goto dealloc_and_fail; 265 } 266 if ((error = load_coff_section(vmspace, vp, data_offset, 267 (caddr_t)(void *)(uintptr_t)data_address, 268 data_size + bss_size, data_size, 269 VM_PROT_ALL)) != 0) { 270 goto dealloc_and_fail; 271 } 272 273 error = 0; 274 275 dealloc_and_fail: 276 if (vm_map_remove(kernel_map, 277 (vm_offset_t) ptr, 278 (vm_offset_t) ptr + PAGE_SIZE)) 279 panic("%s vm_map_remove failed", __func__); 280 281 fail: 282 VOP_UNLOCK(vp, 0, td); 283 unlocked_fail: 284 NDFREE(&nd, NDF_ONLY_PNBUF); 285 vrele(nd.ni_vp); 286 return error; 287} 288 289static int 290exec_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 caddr_t hole; 304 struct thread *td = curthread; 305 306 if (fhdr->f_magic != I386_COFF || 307 !(fhdr->f_flags & F_EXEC)) { 308 309 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 310 return -1; 311 } 312 313 nscns = fhdr->f_nscns; 314 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 315 /* 316 * For now, return an error -- need to be able to 317 * read in all of the section structures. 318 */ 319 320 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__)); 321 return -1; 322 } 323 324 ahdr = (const struct aouthdr*) 325 ((const char*)(imgp->image_header) + sizeof(struct filehdr)); 326 imgp->entry_addr = ahdr->entry; 327 328 scns = (const struct scnhdr*) 329 ((const char*)(imgp->image_header) + sizeof(struct filehdr) + 330 sizeof(struct aouthdr)); 331 332 VOP_UNLOCK(imgp->vp, 0, td); 333 334 if ((error = exec_extract_strings(imgp)) != 0) { 335 DPRINTF(("%s(%d): return %d\n", __FILE__, __LINE__, error)); 336 goto fail; 337 } 338 339 exec_new_vmspace(imgp, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK); 340 vmspace = imgp->proc->p_vmspace; 341 342 for (i = 0; i < nscns; i++) { 343 344 DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, " 345 "scns[i].s_scnptr = %d\n", i, scns[i].s_name, 346 scns[i].s_vaddr, scns[i].s_scnptr)); 347 if (scns[i].s_flags & STYP_NOLOAD) { 348 /* 349 * A section that is not loaded, for whatever 350 * reason. It takes precedance over other flag 351 * bits... 352 */ 353 continue; 354 } else if (scns[i].s_flags & STYP_TEXT) { 355 text_address = scns[i].s_vaddr; 356 text_size = scns[i].s_size; 357 text_offset = scns[i].s_scnptr; 358 } else if (scns[i].s_flags & STYP_DATA) { 359 /* .data section */ 360 data_address = scns[i].s_vaddr; 361 data_size = scns[i].s_size; 362 data_offset = scns[i].s_scnptr; 363 } else if (scns[i].s_flags & STYP_BSS) { 364 /* .bss section */ 365 bss_size = scns[i].s_size; 366 } else if (scns[i].s_flags & STYP_LIB) { 367 char *buf = 0; 368 int foff = trunc_page(scns[i].s_scnptr); 369 int off = scns[i].s_scnptr - foff; 370 int len = round_page(scns[i].s_size + PAGE_SIZE); 371 int j; 372 373 if ((error = vm_mmap(kernel_map, 374 (vm_offset_t *) &buf, 375 len, 376 VM_PROT_READ, 377 VM_PROT_READ, 378 0, 379 (caddr_t) imgp->vp, 380 foff)) != 0) { 381 error = ENOEXEC; 382 goto fail; 383 } 384 if(scns[i].s_size) { 385 char *libbuf; 386 int emul_path_len = strlen(ibcs2_emul_path); 387 388 libbuf = malloc(MAXPATHLEN + emul_path_len, 389 M_TEMP, M_WAITOK); 390 strcpy(libbuf, ibcs2_emul_path); 391 392 for (j = off; j < scns[i].s_size + off;) { 393 long stroff, nextoff; 394 char *libname; 395 396 nextoff = 4 * *(long *)(buf + j); 397 stroff = 4 * *(long *)(buf + j + sizeof(long)); 398 399 libname = buf + j + stroff; 400 j += nextoff; 401 402 DPRINTF(("%s(%d): shared library %s\n", 403 __FILE__, __LINE__, libname)); 404 strcpy(&libbuf[emul_path_len], libname); 405/* XXXKSE only 1:1 in coff */ error = coff_load_file( 406 FIRST_THREAD_IN_PROC(imgp->proc), libbuf); 407 if (error) 408 error = coff_load_file( 409 FIRST_THREAD_IN_PROC(imgp->proc), 410 libname); 411 if (error) 412 break; 413 } 414 free(libbuf, M_TEMP); 415 } 416 if (vm_map_remove(kernel_map, 417 (vm_offset_t) buf, 418 (vm_offset_t) buf + len)) 419 panic("exec_coff_imgact vm_map_remove failed"); 420 if (error) 421 goto fail; 422 } 423 } 424 /* 425 * Map in .text now 426 */ 427 428 DPRINTF(("%s(%d): load_coff_section(vmspace, " 429 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n", 430 __FILE__, __LINE__, text_offset, text_address, 431 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE)); 432 if ((error = load_coff_section(vmspace, imgp->vp, 433 text_offset, 434 (caddr_t)(void *)(uintptr_t)text_address, 435 text_size, text_size, 436 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) { 437 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 438 goto fail; 439 } 440 /* 441 * Map in .data and .bss now 442 */ 443 444 445 DPRINTF(("%s(%d): load_coff_section(vmspace, " 446 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n", 447 __FILE__, __LINE__, data_offset, data_address, 448 data_size + bss_size, data_size, VM_PROT_ALL)); 449 if ((error = load_coff_section(vmspace, imgp->vp, 450 data_offset, 451 (caddr_t)(void *)(uintptr_t)data_address, 452 data_size + bss_size, data_size, 453 VM_PROT_ALL)) != 0) { 454 455 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error)); 456 goto fail; 457 } 458 459 imgp->interpreted = 0; 460 imgp->proc->p_sysent = &ibcs2_svr3_sysvec; 461 462 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 463 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 464 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address; 465 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address; 466 467 hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize); 468 469 470 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", 471 __FILE__, __LINE__, hole)); 472 DPRINTF(("imgact: error = %d\n", error)); 473 474 error = vm_map_find(&vmspace->vm_map, NULL, 0, 475 (vm_offset_t *) &hole, PAGE_SIZE, FALSE, 476 VM_PROT_ALL, VM_PROT_ALL, 0); 477 478 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n", 479 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 480 ctob(vmspace->vm_dsize) + vmspace->vm_daddr )); 481 DPRINTF(("%s(%d): returning successfully!\n", __FILE__, __LINE__)); 482 483fail: 484 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 485 486 return error; 487} 488 489/* 490 * Tell kern_execve.c about it, with a little help from the linker. 491 */ 492static struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 493EXEC_SET(coff, coff_execsw); 494