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 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  *      $Id: imgact_coff.c,v 1.30 1998/02/11 01:46:47 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/vm_prot.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 #include <vm/vm_zone.h>
  50
  51 #include <i386/ibcs2/coff.h>
  52 #include <i386/ibcs2/ibcs2_util.h>
  53
  54 extern struct sysentvec ibcs2_svr3_sysvec;
  55
  56 static int coff_load_file __P((struct proc *p, char *name));
  57 static int exec_coff_imgact __P((struct image_params *imgp));
  58
  59 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));
  60
  61 static int
  62 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
  63                   caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
  64 {
  65         size_t map_len;
  66         vm_offset_t map_offset;
  67         vm_offset_t map_addr;
  68         int error;
  69         unsigned char *data_buf = 0;
  70         size_t copy_len;
  71
  72         map_offset = trunc_page(offset);
  73         map_addr = trunc_page(vmaddr);
  74
  75         if (memsz > filsz) {
  76                 /*
  77                  * We have the stupid situation that
  78                  * the section is longer than it is on file,
  79                  * which means it has zero-filled areas, and
  80                  * we have to work for it.  Stupid iBCS!
  81                  */
  82                 map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
  83         } else {
  84                 /*
  85                  * The only stuff we care about is on disk, and we
  86                  * don't care if we map in more than is really there.
  87                  */
  88                 map_len = round_page(offset + filsz) - trunc_page(map_offset);
  89         }
  90
  91         DPRINTF(("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
  92                 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n",
  93                 __FILE__, __LINE__, map_addr, map_len, prot, map_offset));
  94
  95         if (error = vm_mmap(&vmspace->vm_map,
  96                              &map_addr,
  97                              map_len,
  98                              prot,
  99                              VM_PROT_ALL,
 100                              MAP_PRIVATE | MAP_FIXED,
 101                              (caddr_t) vp,
 102                              map_offset))
 103                 return error;
 104
 105         if (memsz == filsz) {
 106                 /* We're done! */
 107                 return 0;
 108         }
 109
 110         /*
 111          * Now we have screwball stuff, to accomodate stupid COFF.
 112          * We have to map the remaining bit of the file into the kernel's
 113          * memory map, allocate some anonymous memory, copy that last
 114          * bit into it, and then we're done. *sigh*
 115          * For clean-up reasons, we actally map in the file last.
 116          */
 117
 118         copy_len = (offset + filsz) - trunc_page(offset + filsz);
 119         map_addr = trunc_page(vmaddr + filsz);
 120         map_len = round_page(vmaddr + memsz) - map_addr;
 121
 122         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));
 123
 124         if (map_len != 0) {
 125                 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
 126                                     map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
 127                 if (error)
 128                         return error;
 129         }
 130
 131         if (error = vm_mmap(kernel_map,
 132                             (vm_offset_t *) &data_buf,
 133                             PAGE_SIZE,
 134                             VM_PROT_READ,
 135                             VM_PROT_READ,
 136                             0,
 137                             (caddr_t) vp,
 138                             trunc_page(offset + filsz)))
 139                 return error;
 140
 141         error = copyout(data_buf, (caddr_t) map_addr, copy_len);
 142
 143         if (vm_map_remove(kernel_map,
 144                           (vm_offset_t) data_buf,
 145                           (vm_offset_t) data_buf + PAGE_SIZE))
 146                 panic("load_coff_section vm_map_remove failed");
 147
 148         return error;
 149 }
 150
 151 static int
 152 coff_load_file(struct proc *p, char *name)
 153 {
 154         struct vmspace *vmspace = p->p_vmspace;
 155         int error;
 156         struct nameidata nd;
 157         struct vnode *vp;
 158         struct vattr attr;
 159         struct filehdr *fhdr;
 160         struct aouthdr *ahdr;
 161         struct scnhdr *scns;
 162         char *ptr = 0;
 163         int nscns;
 164         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 165         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 166         unsigned long bss_size = 0;
 167         int i;
 168
 169         /* XXX use of 'curproc' should be 'p'?*/
 170         NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, curproc);
 171
 172         error = namei(&nd);
 173         if (error)
 174                 return error;
 175
 176         vp = nd.ni_vp;
 177         if (vp == NULL)
 178                 return ENOEXEC;
 179
 180         if (vp->v_writecount) {
 181                 error = ETXTBSY;
 182                 goto fail;
 183         }
 184
 185         if (error = VOP_GETATTR(vp, &attr, p->p_ucred, p))
 186                 goto fail;
 187
 188         if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
 189             || ((attr.va_mode & 0111) == 0)
 190             || (attr.va_type != VREG))
 191                 goto fail;
 192
 193         if (attr.va_size == 0) {
 194                 error = ENOEXEC;
 195                 goto fail;
 196         }
 197
 198         if (error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p))
 199                 goto fail;
 200
 201         if (error = VOP_OPEN(vp, FREAD, p->p_ucred, p))
 202                 goto fail;
 203
 204         /*
 205          * Lose the lock on the vnode. It's no longer needed, and must not
 206          * exist for the pagefault paging to work below.
 207          */
 208         VOP_UNLOCK(vp, 0, p);
 209
 210         if (error = vm_mmap(kernel_map,
 211                             (vm_offset_t *) &ptr,
 212                             PAGE_SIZE,
 213                             VM_PROT_READ,
 214                             VM_PROT_READ,
 215                             0,
 216                             (caddr_t) vp,
 217                             0))
 218         goto fail;
 219
 220         fhdr = (struct filehdr *)ptr;
 221
 222         if (fhdr->f_magic != I386_COFF) {
 223                 error = ENOEXEC;
 224                 goto dealloc_and_fail;
 225         }
 226
 227         nscns = fhdr->f_nscns;
 228
 229         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 230                 /*
 231                  * XXX -- just fail.  I'm so lazy.
 232                  */
 233                 error = ENOEXEC;
 234                 goto dealloc_and_fail;
 235         }
 236
 237         ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
 238
 239         scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
 240                           + sizeof(struct aouthdr));
 241
 242         for (i = 0; i < nscns; i++) {
 243                 if (scns[i].s_flags & STYP_NOLOAD)
 244                         continue;
 245                 else if (scns[i].s_flags & STYP_TEXT) {
 246                         text_address = scns[i].s_vaddr;
 247                         text_size = scns[i].s_size;
 248                         text_offset = scns[i].s_scnptr;
 249                 }
 250                 else if (scns[i].s_flags & STYP_DATA) {
 251                         data_address = scns[i].s_vaddr;
 252                         data_size = scns[i].s_size;
 253                         data_offset = scns[i].s_scnptr;
 254                 } else if (scns[i].s_flags & STYP_BSS) {
 255                         bss_size = scns[i].s_size;
 256                 }
 257         }
 258
 259         if (error = load_coff_section(vmspace, vp, text_offset,
 260                                       (caddr_t)(void *)(uintptr_t)text_address,
 261                                       text_size, text_size,
 262                                       VM_PROT_READ | VM_PROT_EXECUTE)) {
 263                 goto dealloc_and_fail;
 264         }
 265         if (error = load_coff_section(vmspace, vp, data_offset,
 266                                       (caddr_t)(void *)(uintptr_t)data_address,
 267                                       data_size + bss_size, data_size,
 268                                       VM_PROT_ALL)) {
 269                 goto dealloc_and_fail;
 270         }
 271
 272         error = 0;
 273
 274         dealloc_and_fail:
 275         if (vm_map_remove(kernel_map,
 276                           (vm_offset_t) ptr,
 277                           (vm_offset_t) ptr + PAGE_SIZE))
 278                 panic(__FUNCTION__ " vm_map_remove failed");
 279
 280  fail:
 281     vput(nd.ni_vp);
 282         zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
 283         return error;
 284 }
 285
 286 static int
 287 exec_coff_imgact(imgp)
 288         struct image_params *imgp;
 289 {
 290         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
 291         const struct aouthdr *ahdr;
 292         const struct scnhdr *scns;
 293         int i;
 294         struct vmspace *vmspace;
 295         int nscns;
 296         int error;
 297         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 298         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 299         unsigned long bss_size = 0;
 300         caddr_t hole;
 301
 302         if (fhdr->f_magic != I386_COFF ||
 303             !(fhdr->f_flags & F_EXEC)) {
 304
 305                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 306                  return -1;
 307         }
 308
 309         nscns = fhdr->f_nscns;
 310         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 311                 /*
 312                  * For now, return an error -- need to be able to
 313                  * read in all of the section structures.
 314                  */
 315
 316                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 317                 return -1;
 318         }
 319
 320         ahdr = (const struct aouthdr*)
 321                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
 322         imgp->entry_addr = ahdr->entry;
 323
 324         scns = (const struct scnhdr*)
 325                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
 326                 sizeof(struct aouthdr));
 327
 328         if (error = exec_extract_strings(imgp)) {
 329                 DPRINTF(("%s(%d):  return %d\n", __FILE__, __LINE__, error));
 330                 return error;
 331         }
 332
 333         exec_new_vmspace(imgp);
 334         vmspace = imgp->proc->p_vmspace;
 335
 336         for (i = 0; i < nscns; i++) {
 337
 338           DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
 339                    "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
 340                    scns[i].s_vaddr, scns[i].s_scnptr));
 341           if (scns[i].s_flags & STYP_NOLOAD) {
 342                 /*
 343                  * A section that is not loaded, for whatever
 344                  * reason.  It takes precedance over other flag
 345                  * bits...
 346                  */
 347                 continue;
 348           } else if (scns[i].s_flags & STYP_TEXT) {
 349                 text_address = scns[i].s_vaddr;
 350                 text_size = scns[i].s_size;
 351                 text_offset = scns[i].s_scnptr;
 352           } else if (scns[i].s_flags & STYP_DATA) {
 353                 /* .data section */
 354                 data_address = scns[i].s_vaddr;
 355                 data_size = scns[i].s_size;
 356                 data_offset = scns[i].s_scnptr;
 357           } else if (scns[i].s_flags & STYP_BSS) {
 358                 /* .bss section */
 359                 bss_size = scns[i].s_size;
 360           } else if (scns[i].s_flags & STYP_LIB) {
 361                 char *buf = 0;
 362                 int foff = trunc_page(scns[i].s_scnptr);
 363                 int off = scns[i].s_scnptr - foff;
 364                 int len = round_page(scns[i].s_size + PAGE_SIZE);
 365                 int j;
 366
 367                 if (error = vm_mmap(kernel_map,
 368                                     (vm_offset_t *) &buf,
 369                                     len,
 370                                     VM_PROT_READ,
 371                                     VM_PROT_READ,
 372                                     0,
 373                                     (caddr_t) imgp->vp,
 374                                     foff)) {
 375                         return ENOEXEC;
 376                 }
 377                 if(scns[i].s_size) {
 378                         char *libbuf;
 379                         int emul_path_len = strlen(ibcs2_emul_path);
 380
 381                         libbuf = malloc(MAXPATHLEN + emul_path_len,
 382                                         M_TEMP, M_WAITOK);
 383                         strcpy(libbuf, ibcs2_emul_path);
 384
 385                         for (j = off; j < scns[i].s_size + off; j++) {
 386                                 char *libname;
 387
 388                                 libname = buf + j + 4 * *(long*)(buf + j + 4);
 389                                 j += 4* *(long*)(buf + j);
 390
 391                                 DPRINTF(("%s(%d):  shared library %s\n",
 392                                          __FILE__, __LINE__, libname));
 393                                 strcpy(&libbuf[emul_path_len], libname);
 394                                 error = coff_load_file(imgp->proc, libbuf);
 395                                 if (error)
 396                                         error = coff_load_file(imgp->proc,
 397                                                                libname);
 398                                 if (error)
 399                                         break;
 400                         }
 401                         free(libbuf, M_TEMP);
 402                 }
 403                 if (vm_map_remove(kernel_map,
 404                                   (vm_offset_t) buf,
 405                                   (vm_offset_t) buf + len))
 406                         panic("exec_coff_imgact vm_map_remove failed");
 407                 if (error)
 408                         return error;
 409                 }
 410         }
 411         /*
 412          * Map in .text now
 413          */
 414
 415         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
 416                 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
 417                 __FILE__, __LINE__, text_offset, text_address,
 418                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
 419         if (error = load_coff_section(vmspace, imgp->vp,
 420                                       text_offset,
 421                                       (caddr_t)(void *)(uintptr_t)text_address,
 422                                       text_size, text_size,
 423                                       VM_PROT_READ | VM_PROT_EXECUTE)) {
 424                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 425                 return error;
 426         }
 427         /*
 428          * Map in .data and .bss now
 429          */
 430
 431
 432         DPRINTF(("%s(%d): load_coff_section(vmspace, "
 433                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
 434                 __FILE__, __LINE__, data_offset, data_address,
 435                 data_size + bss_size, data_size, VM_PROT_ALL));
 436         if (error = load_coff_section(vmspace, imgp->vp,
 437                                       data_offset,
 438                                       (caddr_t)(void *)(uintptr_t)data_address,
 439                                       data_size + bss_size, data_size,
 440                                       VM_PROT_ALL)) {
 441
 442                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 443                 return error;
 444         }
 445
 446         imgp->interpreted = 0;
 447         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
 448
 449         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
 450         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
 451         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
 452         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
 453
 454         hole = (caddr_t)trunc_page(vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
 455
 456
 457         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
 458                 __FILE__, __LINE__, hole));
 459         DPRINTF(("imgact: error = %d\n", error));
 460
 461         error = vm_map_find(&vmspace->vm_map, NULL, 0,
 462                             (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
 463                                 VM_PROT_ALL, VM_PROT_ALL, 0);
 464
 465         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
 466                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
 467                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
 468         DPRINTF(("%s(%d):  returning successfully!\n", __FILE__, __LINE__));
 469
 470         /* Indicate that this file should not be modified */
 471         imgp->vp->v_flag |= VTEXT;
 472         return 0;
 473 }
 474
 475 /*
 476  * Tell kern_execve.c about it, with a little help from the linker.
 477  * Since `const' objects end up in the text segment, TEXT_SET is the
 478  * correct directive to use.  Do not staticize; used by coff LKM.
 479  */
 480 const struct execsw coff_execsw = { exec_coff_imgact, "coff" };
 481 TEXT_SET(execsw_set, coff_execsw);