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%08lx, 0x%x, 0x%x, "
  95                 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, 0x%x)\n",
  96                 __FILE__, __LINE__, map_addr, map_len, prot, map_offset));
  97
  98         if ((error = vm_mmap(&vmspace->vm_map,
  99                              &map_addr,
 100                              map_len,
 101                              prot,
 102                              VM_PROT_ALL,
 103                              MAP_PRIVATE | MAP_FIXED,
 104                              OBJT_VNODE,
 105                              vp,
 106                              map_offset)) != 0)
 107                 return error;
 108
 109         if (memsz == filsz) {
 110                 /* We're done! */
 111                 return 0;
 112         }
 113
 114         /*
 115          * Now we have screwball stuff, to accomodate stupid COFF.
 116          * We have to map the remaining bit of the file into the kernel's
 117          * memory map, allocate some anonymous memory, copy that last
 118          * bit into it, and then we're done. *sigh*
 119          * For clean-up reasons, we actally map in the file last.
 120          */
 121
 122         copy_len = (offset + filsz) - trunc_page(offset + filsz);
 123         map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
 124         map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
 125
 126         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));
 127
 128         if (map_len != 0) {
 129                 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
 130                                     map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
 131                 if (error)
 132                         return error;
 133         }
 134
 135         if ((error = vm_mmap(kernel_map,
 136                             (vm_offset_t *) &data_buf,
 137                             PAGE_SIZE,
 138                             VM_PROT_READ,
 139                             VM_PROT_READ,
 140                             0,
 141                             OBJT_VNODE,
 142                             vp,
 143                             trunc_page(offset + filsz))) != 0)
 144                 return error;
 145
 146         error = copyout(data_buf, (caddr_t) map_addr, copy_len);
 147
 148         if (vm_map_remove(kernel_map,
 149                           (vm_offset_t) data_buf,
 150                           (vm_offset_t) data_buf + PAGE_SIZE))
 151                 panic("load_coff_section vm_map_remove failed");
 152
 153         return error;
 154 }
 155
 156 static int
 157 coff_load_file(struct thread *td, char *name)
 158 {
 159         struct proc *p = td->td_proc;
 160         struct vmspace *vmspace = p->p_vmspace;
 161         int error;
 162         struct nameidata nd;
 163         struct vnode *vp;
 164         struct vattr attr;
 165         struct filehdr *fhdr;
 166         struct aouthdr *ahdr;
 167         struct scnhdr *scns;
 168         char *ptr = 0;
 169         int nscns;
 170         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 171         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 172         unsigned long bss_size = 0;
 173         int i;
 174
 175         NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME,
 176             UIO_SYSSPACE, name, td);
 177
 178         error = namei(&nd);
 179         if (error)
 180                 return error;
 181
 182         vp = nd.ni_vp;
 183         if (vp == NULL)
 184                 return ENOEXEC;
 185
 186         if (vp->v_writecount) {
 187                 error = ETXTBSY;
 188                 goto fail;
 189         }
 190
 191         if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0)
 192                 goto fail;
 193
 194         if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
 195             || ((attr.va_mode & 0111) == 0)
 196             || (attr.va_type != VREG))
 197                 goto fail;
 198
 199         if (attr.va_size == 0) {
 200                 error = ENOEXEC;
 201                 goto fail;
 202         }
 203
 204         if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
 205                 goto fail;
 206
 207         if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0)
 208                 goto fail;
 209
 210         /*
 211          * Lose the lock on the vnode. It's no longer needed, and must not
 212          * exist for the pagefault paging to work below.
 213          */
 214         VOP_UNLOCK(vp, 0);
 215
 216         if ((error = vm_mmap(kernel_map,
 217                             (vm_offset_t *) &ptr,
 218                             PAGE_SIZE,
 219                             VM_PROT_READ,
 220                             VM_PROT_READ,
 221                             0,
 222                             OBJT_VNODE,
 223                             vp,
 224                             0)) != 0)
 225                 goto unlocked_fail;
 226
 227         fhdr = (struct filehdr *)ptr;
 228
 229         if (fhdr->f_magic != I386_COFF) {
 230                 error = ENOEXEC;
 231                 goto dealloc_and_fail;
 232         }
 233
 234         nscns = fhdr->f_nscns;
 235
 236         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 237                 /*
 238                  * XXX -- just fail.  I'm so lazy.
 239                  */
 240                 error = ENOEXEC;
 241                 goto dealloc_and_fail;
 242         }
 243
 244         ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
 245
 246         scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
 247                           + sizeof(struct aouthdr));
 248
 249         for (i = 0; i < nscns; i++) {
 250                 if (scns[i].s_flags & STYP_NOLOAD)
 251                         continue;
 252                 else if (scns[i].s_flags & STYP_TEXT) {
 253                         text_address = scns[i].s_vaddr;
 254                         text_size = scns[i].s_size;
 255                         text_offset = scns[i].s_scnptr;
 256                 }
 257                 else if (scns[i].s_flags & STYP_DATA) {
 258                         data_address = scns[i].s_vaddr;
 259                         data_size = scns[i].s_size;
 260                         data_offset = scns[i].s_scnptr;
 261                 } else if (scns[i].s_flags & STYP_BSS) {
 262                         bss_size = scns[i].s_size;
 263                 }
 264         }
 265
 266         if ((error = load_coff_section(vmspace, vp, text_offset,
 267                                       (caddr_t)(void *)(uintptr_t)text_address,
 268                                       text_size, text_size,
 269                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
 270                 goto dealloc_and_fail;
 271         }
 272         if ((error = load_coff_section(vmspace, vp, data_offset,
 273                                       (caddr_t)(void *)(uintptr_t)data_address,
 274                                       data_size + bss_size, data_size,
 275                                       VM_PROT_ALL)) != 0) {
 276                 goto dealloc_and_fail;
 277         }
 278
 279         error = 0;
 280
 281  dealloc_and_fail:
 282         if (vm_map_remove(kernel_map,
 283                           (vm_offset_t) ptr,
 284                           (vm_offset_t) ptr + PAGE_SIZE))
 285                 panic("%s vm_map_remove failed", __func__);
 286
 287  fail:
 288         VOP_UNLOCK(vp, 0);
 289  unlocked_fail:
 290         NDFREE(&nd, NDF_ONLY_PNBUF);
 291         vrele(nd.ni_vp);
 292         return error;
 293 }
 294
 295 static int
 296 exec_coff_imgact(imgp)
 297         struct image_params *imgp;
 298 {
 299         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
 300         const struct aouthdr *ahdr;
 301         const struct scnhdr *scns;
 302         int i;
 303         struct vmspace *vmspace;
 304         int nscns;
 305         int error;
 306         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 307         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 308         unsigned long bss_size = 0;
 309         caddr_t hole;
 310
 311         if (fhdr->f_magic != I386_COFF ||
 312             !(fhdr->f_flags & F_EXEC)) {
 313
 314                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 315                  return -1;
 316         }
 317
 318         nscns = fhdr->f_nscns;
 319         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 320                 /*
 321                  * For now, return an error -- need to be able to
 322                  * read in all of the section structures.
 323                  */
 324
 325                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 326                 return -1;
 327         }
 328
 329         ahdr = (const struct aouthdr*)
 330                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
 331         imgp->entry_addr = ahdr->entry;
 332
 333         scns = (const struct scnhdr*)
 334                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
 335                 sizeof(struct aouthdr));
 336
 337         VOP_UNLOCK(imgp->vp, 0);
 338
 339         error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
 340         if (error)
 341                 goto fail;
 342         vmspace = imgp->proc->p_vmspace;
 343
 344         for (i = 0; i < nscns; i++) {
 345
 346           DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
 347                    "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
 348                    scns[i].s_vaddr, scns[i].s_scnptr));
 349           if (scns[i].s_flags & STYP_NOLOAD) {
 350                 /*
 351                  * A section that is not loaded, for whatever
 352                  * reason.  It takes precedance over other flag
 353                  * bits...
 354                  */
 355                 continue;
 356           } else if (scns[i].s_flags & STYP_TEXT) {
 357                 text_address = scns[i].s_vaddr;
 358                 text_size = scns[i].s_size;
 359                 text_offset = scns[i].s_scnptr;
 360           } else if (scns[i].s_flags & STYP_DATA) {
 361                 /* .data section */
 362                 data_address = scns[i].s_vaddr;
 363                 data_size = scns[i].s_size;
 364                 data_offset = scns[i].s_scnptr;
 365           } else if (scns[i].s_flags & STYP_BSS) {
 366                 /* .bss section */
 367                 bss_size = scns[i].s_size;
 368           } else if (scns[i].s_flags & STYP_LIB) {
 369                 char *buf = 0;
 370                 int foff = trunc_page(scns[i].s_scnptr);
 371                 int off = scns[i].s_scnptr - foff;
 372                 int len = round_page(scns[i].s_size + PAGE_SIZE);
 373                 int j;
 374
 375                 if ((error = vm_mmap(kernel_map,
 376                                     (vm_offset_t *) &buf,
 377                                     len,
 378                                     VM_PROT_READ,
 379                                     VM_PROT_READ,
 380                                     0,
 381                                     OBJT_VNODE,
 382                                     imgp->vp,
 383                                     foff)) != 0) {
 384                         error = ENOEXEC;
 385                         goto fail;
 386                 }
 387                 if(scns[i].s_size) {
 388                         char *libbuf;
 389                         int emul_path_len = strlen(ibcs2_emul_path);
 390
 391                         libbuf = malloc(MAXPATHLEN + emul_path_len,
 392                                         M_TEMP, M_WAITOK);
 393                         strcpy(libbuf, ibcs2_emul_path);
 394
 395                         for (j = off; j < scns[i].s_size + off;) {
 396                                 long stroff, nextoff;
 397                                 char *libname;
 398
 399                                 nextoff = 4 * *(long *)(buf + j);
 400                                 stroff = 4 * *(long *)(buf + j + sizeof(long));
 401
 402                                 libname = buf + j + stroff;
 403                                 j += nextoff;
 404
 405                                 DPRINTF(("%s(%d):  shared library %s\n",
 406                                          __FILE__, __LINE__, libname));
 407                                 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN);
 408                                 error = coff_load_file(
 409                                     FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
 410                                 if (error)
 411                                         error = coff_load_file(
 412                                             FIRST_THREAD_IN_PROC(imgp->proc),
 413                                             libname);
 414                                 if (error)
 415                                         break;
 416                         }
 417                         free(libbuf, M_TEMP);
 418                 }
 419                 if (vm_map_remove(kernel_map,
 420                                   (vm_offset_t) buf,
 421                                   (vm_offset_t) buf + len))
 422                         panic("exec_coff_imgact vm_map_remove failed");
 423                 if (error)
 424                         goto fail;
 425                 }
 426         }
 427         /*
 428          * Map in .text now
 429          */
 430
 431         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
 432                 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
 433                 __FILE__, __LINE__, text_offset, text_address,
 434                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
 435         if ((error = load_coff_section(vmspace, imgp->vp,
 436                                       text_offset,
 437                                       (caddr_t)(void *)(uintptr_t)text_address,
 438                                       text_size, text_size,
 439                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
 440                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 441                 goto fail;
 442         }
 443         /*
 444          * Map in .data and .bss now
 445          */
 446
 447
 448         DPRINTF(("%s(%d): load_coff_section(vmspace, "
 449                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
 450                 __FILE__, __LINE__, data_offset, data_address,
 451                 data_size + bss_size, data_size, VM_PROT_ALL));
 452         if ((error = load_coff_section(vmspace, imgp->vp,
 453                                       data_offset,
 454                                       (caddr_t)(void *)(uintptr_t)data_address,
 455                                       data_size + bss_size, data_size,
 456                                       VM_PROT_ALL)) != 0) {
 457
 458                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 459                 goto fail;
 460         }
 461
 462         imgp->interpreted = 0;
 463         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
 464
 465         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
 466         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
 467         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
 468         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
 469
 470         hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
 471
 472
 473         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
 474                 __FILE__, __LINE__, hole));
 475         DPRINTF(("imgact: error = %d\n", error));
 476
 477         error = vm_map_find(&vmspace->vm_map, NULL, 0,
 478                             (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
 479                                 VM_PROT_ALL, VM_PROT_ALL, 0);
 480
 481         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
 482                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
 483                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
 484         DPRINTF(("%s(%d):  returning successfully!\n", __FILE__, __LINE__));
 485
 486 fail:
 487         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
 488
 489         return error;
 490 }
 491
 492 /*
 493  * Tell kern_execve.c about it, with a little help from the linker.
 494  */
 495 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
 496 EXEC_SET(coff, coff_execsw);