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, 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);