sys/emulation/ibcs2/coff/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 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: src/sys/i386/ibcs2/imgact_coff.c,v 1.40 1999/12/15 23:01:47 eivind Exp $
  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/pmap.h>
  45 #include <vm/vm_map.h>
  46 #include <vm/vm_kern.h>
  47 #include <vm/vm_extern.h>
  48 #include <vm/vm_zone.h>
  49
  50 #include <i386/ibcs2/coff.h>
  51 #include <i386/ibcs2/ibcs2_util.h>
  52
  53 extern struct sysentvec ibcs2_svr3_sysvec;
  54
  55 static int coff_load_file __P((struct proc *p, char *name));
  56 static int exec_coff_imgact __P((struct image_params *imgp));
  57
  58 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));
  59
  60 static int
  61 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
  62                   caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
  63 {
  64         size_t map_len;
  65         vm_offset_t map_offset;
  66         vm_offset_t map_addr;
  67         int error;
  68         unsigned char *data_buf = 0;
  69         size_t copy_len;
  70
  71         map_offset = trunc_page(offset);
  72         map_addr = trunc_page((vm_offset_t)vmaddr);
  73
  74         if (memsz > filsz) {
  75                 /*
  76                  * We have the stupid situation that
  77                  * the section is longer than it is on file,
  78                  * which means it has zero-filled areas, and
  79                  * we have to work for it.  Stupid iBCS!
  80                  */
  81                 map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
  82         } else {
  83                 /*
  84                  * The only stuff we care about is on disk, and we
  85                  * don't care if we map in more than is really there.
  86                  */
  87                 map_len = round_page(offset + filsz) - trunc_page(map_offset);
  88         }
  89
  90         DPRINTF(("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
  91                 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n",
  92                 __FILE__, __LINE__, map_addr, map_len, prot, map_offset));
  93
  94         if ((error = vm_mmap(&vmspace->vm_map,
  95                              &map_addr,
  96                              map_len,
  97                              prot,
  98                              VM_PROT_ALL,
  99                              MAP_PRIVATE | MAP_FIXED,
 100                              (caddr_t) vp,
 101                              map_offset)) != 0)
 102                 return error;
 103
 104         if (memsz == filsz) {
 105                 /* We're done! */
 106                 return 0;
 107         }
 108
 109         /*
 110          * Now we have screwball stuff, to accomodate stupid COFF.
 111          * We have to map the remaining bit of the file into the kernel's
 112          * memory map, allocate some anonymous memory, copy that last
 113          * bit into it, and then we're done. *sigh*
 114          * For clean-up reasons, we actally map in the file last.
 115          */
 116
 117         copy_len = (offset + filsz) - trunc_page(offset + filsz);
 118         map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
 119         map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
 120
 121         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));
 122
 123         if (map_len != 0) {
 124                 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
 125                                     map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
 126                 if (error)
 127                         return error;
 128         }
 129
 130         if ((error = vm_mmap(kernel_map,
 131                             (vm_offset_t *) &data_buf,
 132                             PAGE_SIZE,
 133                             VM_PROT_READ,
 134                             VM_PROT_READ,
 135                             0,
 136                             (caddr_t) vp,
 137                             trunc_page(offset + filsz))) != 0)
 138                 return error;
 139
 140         error = copyout(data_buf, (caddr_t) map_addr, copy_len);
 141
 142         if (vm_map_remove(kernel_map,
 143                           (vm_offset_t) data_buf,
 144                           (vm_offset_t) data_buf + PAGE_SIZE))
 145                 panic("load_coff_section vm_map_remove failed");
 146
 147         return error;
 148 }
 149
 150 static int
 151 coff_load_file(struct proc *p, char *name)
 152 {
 153         struct vmspace *vmspace = p->p_vmspace;
 154         int error;
 155         struct nameidata nd;
 156         struct vnode *vp;
 157         struct vattr attr;
 158         struct filehdr *fhdr;
 159         struct aouthdr *ahdr;
 160         struct scnhdr *scns;
 161         char *ptr = 0;
 162         int nscns;
 163         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 164         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 165         unsigned long bss_size = 0;
 166         int i;
 167
 168         /* XXX use of 'curproc' should be 'p'?*/
 169         NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, curproc);
 170
 171         error = namei(&nd);
 172         if (error)
 173                 return error;
 174
 175         vp = nd.ni_vp;
 176         if (vp == NULL)
 177                 return ENOEXEC;
 178
 179         if (vp->v_writecount) {
 180                 error = ETXTBSY;
 181                 goto fail;
 182         }
 183
 184         if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0)
 185                 goto fail;
 186
 187         if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
 188             || ((attr.va_mode & 0111) == 0)
 189             || (attr.va_type != VREG))
 190                 goto fail;
 191
 192         if (attr.va_size == 0) {
 193                 error = ENOEXEC;
 194                 goto fail;
 195         }
 196
 197         if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0)
 198                 goto fail;
 199
 200         if ((error = VOP_OPEN(vp, FREAD, p->p_ucred, p)) != 0)
 201                 goto fail;
 202
 203         /*
 204          * Lose the lock on the vnode. It's no longer needed, and must not
 205          * exist for the pagefault paging to work below.
 206          */
 207         VOP_UNLOCK(vp, 0, p);
 208
 209         if ((error = vm_mmap(kernel_map,
 210                             (vm_offset_t *) &ptr,
 211                             PAGE_SIZE,
 212                             VM_PROT_READ,
 213                             VM_PROT_READ,
 214                             0,
 215                             (caddr_t) vp,
 216                             0)) != 0)
 217                 goto unlocked_fail;
 218
 219         fhdr = (struct filehdr *)ptr;
 220
 221         if (fhdr->f_magic != I386_COFF) {
 222                 error = ENOEXEC;
 223                 goto dealloc_and_fail;
 224         }
 225
 226         nscns = fhdr->f_nscns;
 227
 228         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 229                 /*
 230                  * XXX -- just fail.  I'm so lazy.
 231                  */
 232                 error = ENOEXEC;
 233                 goto dealloc_and_fail;
 234         }
 235
 236         ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
 237
 238         scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
 239                           + sizeof(struct aouthdr));
 240
 241         for (i = 0; i < nscns; i++) {
 242                 if (scns[i].s_flags & STYP_NOLOAD)
 243                         continue;
 244                 else if (scns[i].s_flags & STYP_TEXT) {
 245                         text_address = scns[i].s_vaddr;
 246                         text_size = scns[i].s_size;
 247                         text_offset = scns[i].s_scnptr;
 248                 }
 249                 else if (scns[i].s_flags & STYP_DATA) {
 250                         data_address = scns[i].s_vaddr;
 251                         data_size = scns[i].s_size;
 252                         data_offset = scns[i].s_scnptr;
 253                 } else if (scns[i].s_flags & STYP_BSS) {
 254                         bss_size = scns[i].s_size;
 255                 }
 256         }
 257
 258         if ((error = load_coff_section(vmspace, vp, text_offset,
 259                                       (caddr_t)(void *)(uintptr_t)text_address,
 260                                       text_size, text_size,
 261                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
 262                 goto dealloc_and_fail;
 263         }
 264         if ((error = load_coff_section(vmspace, vp, data_offset,
 265                                       (caddr_t)(void *)(uintptr_t)data_address,
 266                                       data_size + bss_size, data_size,
 267                                       VM_PROT_ALL)) != 0) {
 268                 goto dealloc_and_fail;
 269         }
 270
 271         error = 0;
 272
 273  dealloc_and_fail:
 274         if (vm_map_remove(kernel_map,
 275                           (vm_offset_t) ptr,
 276                           (vm_offset_t) ptr + PAGE_SIZE))
 277                 panic(__FUNCTION__ " vm_map_remove failed");
 278
 279  fail:
 280         VOP_UNLOCK(vp, 0, p);
 281  unlocked_fail:
 282         NDFREE(&nd, NDF_ONLY_PNBUF);
 283         vrele(nd.ni_vp);
 284         return error;
 285 }
 286
 287 static int
 288 exec_coff_imgact(imgp)
 289         struct image_params *imgp;
 290 {
 291         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
 292         const struct aouthdr *ahdr;
 293         const struct scnhdr *scns;
 294         int i;
 295         struct vmspace *vmspace;
 296         int nscns;
 297         int error;
 298         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 299         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 300         unsigned long bss_size = 0;
 301         caddr_t hole;
 302
 303         if (fhdr->f_magic != I386_COFF ||
 304             !(fhdr->f_flags & F_EXEC)) {
 305
 306                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 307                  return -1;
 308         }
 309
 310         nscns = fhdr->f_nscns;
 311         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 312                 /*
 313                  * For now, return an error -- need to be able to
 314                  * read in all of the section structures.
 315                  */
 316
 317                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 318                 return -1;
 319         }
 320
 321         ahdr = (const struct aouthdr*)
 322                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
 323         imgp->entry_addr = ahdr->entry;
 324
 325         scns = (const struct scnhdr*)
 326                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
 327                 sizeof(struct aouthdr));
 328
 329         if ((error = exec_extract_strings(imgp)) != 0) {
 330                 DPRINTF(("%s(%d):  return %d\n", __FILE__, __LINE__, error));
 331                 return error;
 332         }
 333
 334         exec_new_vmspace(imgp);
 335         vmspace = imgp->proc->p_vmspace;
 336
 337         for (i = 0; i < nscns; i++) {
 338
 339           DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
 340                    "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
 341                    scns[i].s_vaddr, scns[i].s_scnptr));
 342           if (scns[i].s_flags & STYP_NOLOAD) {
 343                 /*
 344                  * A section that is not loaded, for whatever
 345                  * reason.  It takes precedance over other flag
 346                  * bits...
 347                  */
 348                 continue;
 349           } else if (scns[i].s_flags & STYP_TEXT) {
 350                 text_address = scns[i].s_vaddr;
 351                 text_size = scns[i].s_size;
 352                 text_offset = scns[i].s_scnptr;
 353           } else if (scns[i].s_flags & STYP_DATA) {
 354                 /* .data section */
 355                 data_address = scns[i].s_vaddr;
 356                 data_size = scns[i].s_size;
 357                 data_offset = scns[i].s_scnptr;
 358           } else if (scns[i].s_flags & STYP_BSS) {
 359                 /* .bss section */
 360                 bss_size = scns[i].s_size;
 361           } else if (scns[i].s_flags & STYP_LIB) {
 362                 char *buf = 0;
 363                 int foff = trunc_page(scns[i].s_scnptr);
 364                 int off = scns[i].s_scnptr - foff;
 365                 int len = round_page(scns[i].s_size + PAGE_SIZE);
 366                 int j;
 367
 368                 if ((error = vm_mmap(kernel_map,
 369                                     (vm_offset_t *) &buf,
 370                                     len,
 371                                     VM_PROT_READ,
 372                                     VM_PROT_READ,
 373                                     0,
 374                                     (caddr_t) imgp->vp,
 375                                     foff)) != 0) {
 376                         return ENOEXEC;
 377                 }
 378                 if(scns[i].s_size) {
 379                         char *libbuf;
 380                         int emul_path_len = strlen(ibcs2_emul_path);
 381
 382                         libbuf = malloc(MAXPATHLEN + emul_path_len,
 383                                         M_TEMP, M_WAITOK);
 384                         strcpy(libbuf, ibcs2_emul_path);
 385
 386                         for (j = off; j < scns[i].s_size + off; j++) {
 387                                 char *libname;
 388
 389                                 libname = buf + j + 4 * *(long*)(buf + j + 4);
 390                                 j += 4* *(long*)(buf + j);
 391
 392                                 DPRINTF(("%s(%d):  shared library %s\n",
 393                                          __FILE__, __LINE__, libname));
 394                                 strcpy(&libbuf[emul_path_len], libname);
 395                                 error = coff_load_file(imgp->proc, libbuf);
 396                                 if (error)
 397                                         error = coff_load_file(imgp->proc,
 398                                                                libname);
 399                                 if (error)
 400                                         break;
 401                         }
 402                         free(libbuf, M_TEMP);
 403                 }
 404                 if (vm_map_remove(kernel_map,
 405                                   (vm_offset_t) buf,
 406                                   (vm_offset_t) buf + len))
 407                         panic("exec_coff_imgact vm_map_remove failed");
 408                 if (error)
 409                         return error;
 410                 }
 411         }
 412         /*
 413          * Map in .text now
 414          */
 415
 416         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
 417                 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
 418                 __FILE__, __LINE__, text_offset, text_address,
 419                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
 420         if ((error = load_coff_section(vmspace, imgp->vp,
 421                                       text_offset,
 422                                       (caddr_t)(void *)(uintptr_t)text_address,
 423                                       text_size, text_size,
 424                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
 425                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 426                 return error;
 427         }
 428         /*
 429          * Map in .data and .bss now
 430          */
 431
 432
 433         DPRINTF(("%s(%d): load_coff_section(vmspace, "
 434                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
 435                 __FILE__, __LINE__, data_offset, data_address,
 436                 data_size + bss_size, data_size, VM_PROT_ALL));
 437         if ((error = load_coff_section(vmspace, imgp->vp,
 438                                       data_offset,
 439                                       (caddr_t)(void *)(uintptr_t)data_address,
 440                                       data_size + bss_size, data_size,
 441                                       VM_PROT_ALL)) != 0) {
 442
 443                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 444                 return error;
 445         }
 446
 447         imgp->interpreted = 0;
 448         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
 449
 450         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
 451         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
 452         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
 453         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
 454
 455         hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
 456
 457
 458         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
 459                 __FILE__, __LINE__, hole));
 460         DPRINTF(("imgact: error = %d\n", error));
 461
 462         error = vm_map_find(&vmspace->vm_map, NULL, 0,
 463                             (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
 464                                 VM_PROT_ALL, VM_PROT_ALL, 0);
 465
 466         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
 467                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
 468                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
 469         DPRINTF(("%s(%d):  returning successfully!\n", __FILE__, __LINE__));
 470
 471         /* Indicate that this file should not be modified */
 472         imgp->vp->v_flag |= VTEXT;
 473         return 0;
 474 }
 475
 476 /*
 477  * Tell kern_execve.c about it, with a little help from the linker.
 478  */
 479 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
 480 EXEC_SET(coff, coff_execsw);