sys/i386/ibcs2/imgact_coff.c

   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("$FreeBSD$");
  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, 0, 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         kmap_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, writecount;
 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         error = VOP_GET_WRITECOUNT(vp, &writecount);
 185         if (error != 0)
 186                 goto fail;
 187         if (writecount != 0) {
 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         kmap_free_wakeup(exec_map, (vm_offset_t)ptr,  PAGE_SIZE);
 284  fail:
 285         VOP_UNLOCK(vp, 0);
 286  unlocked_fail:
 287         NDFREE(&nd, NDF_ONLY_PNBUF);
 288         vrele(nd.ni_vp);
 289         return error;
 290 }
 291
 292 static int
 293 exec_coff_imgact(imgp)
 294         struct image_params *imgp;
 295 {
 296         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
 297         const struct aouthdr *ahdr;
 298         const struct scnhdr *scns;
 299         int i;
 300         struct vmspace *vmspace;
 301         int nscns;
 302         int error;
 303         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 304         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 305         unsigned long bss_size = 0;
 306         vm_offset_t hole;
 307
 308         if (fhdr->f_magic != I386_COFF ||
 309             !(fhdr->f_flags & F_EXEC)) {
 310
 311                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 312                  return -1;
 313         }
 314
 315         nscns = fhdr->f_nscns;
 316         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 317                 /*
 318                  * For now, return an error -- need to be able to
 319                  * read in all of the section structures.
 320                  */
 321
 322                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 323                 return -1;
 324         }
 325
 326         ahdr = (const struct aouthdr*)
 327                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
 328         imgp->entry_addr = ahdr->entry;
 329
 330         scns = (const struct scnhdr*)
 331                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
 332                 sizeof(struct aouthdr));
 333
 334         VOP_UNLOCK(imgp->vp, 0);
 335
 336         error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
 337         if (error)
 338                 goto fail;
 339         vmspace = imgp->proc->p_vmspace;
 340
 341         for (i = 0; i < nscns; i++) {
 342
 343           DPRINTF(("i = %d, s_name = %s, s_vaddr = %08lx, "
 344                    "s_scnptr = %ld s_size = %lx\n", i, scns[i].s_name,
 345                    scns[i].s_vaddr, scns[i].s_scnptr, scns[i].s_size));
 346           if (scns[i].s_flags & STYP_NOLOAD) {
 347                 /*
 348                  * A section that is not loaded, for whatever
 349                  * reason.  It takes precedance over other flag
 350                  * bits...
 351                  */
 352                 continue;
 353           } else if (scns[i].s_flags & STYP_TEXT) {
 354                 text_address = scns[i].s_vaddr;
 355                 text_size = scns[i].s_size;
 356                 text_offset = scns[i].s_scnptr;
 357           } else if (scns[i].s_flags & STYP_DATA) {
 358                 /* .data section */
 359                 data_address = scns[i].s_vaddr;
 360                 data_size = scns[i].s_size;
 361                 data_offset = scns[i].s_scnptr;
 362           } else if (scns[i].s_flags & STYP_BSS) {
 363                 /* .bss section */
 364                 bss_size = scns[i].s_size;
 365           } else if (scns[i].s_flags & STYP_LIB) {
 366                 char *buf = 0;
 367                 int foff = trunc_page(scns[i].s_scnptr);
 368                 int off = scns[i].s_scnptr - foff;
 369                 int len = round_page(scns[i].s_size + PAGE_SIZE);
 370                 int j;
 371
 372                 if ((error = vm_mmap(exec_map,
 373                                     (vm_offset_t *) &buf,
 374                                     len,
 375                                     VM_PROT_READ,
 376                                     VM_PROT_READ,
 377                                     MAP_SHARED,
 378                                     OBJT_VNODE,
 379                                     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                                 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN);
 405                                 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                                         printf(
 413                                 "error %d loading coff shared library %s\n",
 414                                             error, libname);
 415                                         break;
 416                                 }
 417                         }
 418                         free(libbuf, M_TEMP);
 419                 }
 420                 kmap_free_wakeup(exec_map, (vm_offset_t)buf, len);
 421                 if (error)
 422                         goto fail;
 423                 }
 424         }
 425         /*
 426          * Map in .text now
 427          */
 428
 429         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
 430                 "imgp->vp, %08lx, %08lx, 0x%lx, 0x%lx, 0x%x)\n",
 431                 __FILE__, __LINE__, text_offset, text_address,
 432                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
 433         if ((error = load_coff_section(vmspace, imgp->vp,
 434                                       text_offset,
 435                                       (caddr_t)(void *)(uintptr_t)text_address,
 436                                       text_size, text_size,
 437                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
 438                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 439                 goto fail;
 440         }
 441         /*
 442          * Map in .data and .bss now
 443          */
 444
 445
 446         DPRINTF(("%s(%d): load_coff_section(vmspace, "
 447                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%lx, 0x%lx, 0x%x)\n",
 448                 __FILE__, __LINE__, data_offset, data_address,
 449                 data_size + bss_size, data_size, VM_PROT_ALL));
 450         if ((error = load_coff_section(vmspace, imgp->vp,
 451                                       data_offset,
 452                                       (caddr_t)(void *)(uintptr_t)data_address,
 453                                       data_size + bss_size, data_size,
 454                                       VM_PROT_ALL)) != 0) {
 455
 456                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 457                 goto fail;
 458         }
 459
 460         imgp->interpreted = 0;
 461         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
 462
 463         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
 464         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
 465         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
 466         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
 467
 468         hole = trunc_page((vm_offset_t)vmspace->vm_daddr +
 469             ctob(vmspace->vm_dsize));
 470
 471         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%jx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
 472             __FILE__, __LINE__, (uintmax_t)hole));
 473         DPRINTF(("imgact: error = %d\n", error));
 474
 475         vm_map_find(&vmspace->vm_map, NULL, 0,
 476             (vm_offset_t *)&hole, PAGE_SIZE, 0, VMFS_NO_SPACE,
 477             VM_PROT_ALL, VM_PROT_ALL, 0);
 478         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%p end = 0x%p\n",
 479                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
 480                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
 481         DPRINTF(("%s(%d):  returning %d!\n", __FILE__, __LINE__, error));
 482
 483 fail:
 484         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
 485
 486         return (error);
 487 }
 488
 489 /*
 490  * Tell kern_execve.c about it, with a little help from the linker.
 491  */
 492 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
 493 EXEC_SET(coff, coff_execsw);