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  * $DragonFly: src/sys/emulation/ibcs2/coff/Attic/imgact_coff.c,v 1.14 2005/02/17 13:59:36 joerg Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/mman.h>
  36 #include <sys/imgact.h>
  37 #include <sys/kernel.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mount.h>
  41 #include <sys/proc.h>
  42 #include <sys/nlookup.h>
  43 #include <sys/vnode.h>
  44
  45 #include <vm/vm.h>
  46 #include <vm/pmap.h>
  47 #include <vm/vm_map.h>
  48 #include <vm/vm_kern.h>
  49 #include <vm/vm_extern.h>
  50 #include <vm/vm_zone.h>
  51
  52 #include "../i386/coff.h"
  53 #include "../i386/ibcs2_util.h"
  54
  55 extern struct sysentvec ibcs2_svr3_sysvec;
  56
  57 static int coff_load_file (struct thread *td, char *name);
  58 static int exec_coff_imgact (struct image_params *imgp);
  59
  60 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);
  61
  62 static int
  63 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
  64                   caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
  65 {
  66         size_t map_len;
  67         vm_offset_t map_offset;
  68         vm_offset_t map_addr;
  69         int error;
  70         unsigned char *data_buf = 0;
  71         size_t copy_len;
  72
  73         map_offset = trunc_page(offset);
  74         map_addr = trunc_page((vm_offset_t)vmaddr);
  75
  76         if (memsz > filsz) {
  77                 /*
  78                  * We have the stupid situation that
  79                  * the section is longer than it is on file,
  80                  * which means it has zero-filled areas, and
  81                  * we have to work for it.  Stupid iBCS!
  82                  */
  83                 map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
  84         } else {
  85                 /*
  86                  * The only stuff we care about is on disk, and we
  87                  * don't care if we map in more than is really there.
  88                  */
  89                 map_len = round_page(offset + filsz) - trunc_page(map_offset);
  90         }
  91
  92         DPRINTF(("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
  93                 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n",
  94                 __FILE__, __LINE__, map_addr, map_len, prot, map_offset));
  95
  96         if ((error = vm_mmap(&vmspace->vm_map,
  97                              &map_addr,
  98                              map_len,
  99                              prot,
 100                              VM_PROT_ALL,
 101                              MAP_PRIVATE | MAP_FIXED,
 102                              (caddr_t) vp,
 103                              map_offset)) != 0)
 104                 return error;
 105
 106         if (memsz == filsz) {
 107                 /* We're done! */
 108                 return 0;
 109         }
 110
 111         /*
 112          * Now we have screwball stuff, to accomodate stupid COFF.
 113          * We have to map the remaining bit of the file into the kernel's
 114          * memory map, allocate some anonymous memory, copy that last
 115          * bit into it, and then we're done. *sigh*
 116          * For clean-up reasons, we actally map in the file last.
 117          */
 118
 119         copy_len = (offset + filsz) - trunc_page(offset + filsz);
 120         map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
 121         map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
 122
 123         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));
 124
 125         if (map_len != 0) {
 126                 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
 127                                     map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
 128                 if (error)
 129                         return error;
 130         }
 131
 132         if ((error = vm_mmap(kernel_map,
 133                             (vm_offset_t *) &data_buf,
 134                             PAGE_SIZE,
 135                             VM_PROT_READ,
 136                             VM_PROT_READ,
 137                             0,
 138                             (caddr_t) vp,
 139                             trunc_page(offset + filsz))) != 0)
 140                 return error;
 141
 142         error = copyout(data_buf, (caddr_t) map_addr, copy_len);
 143
 144         if (vm_map_remove(kernel_map,
 145                           (vm_offset_t) data_buf,
 146                           (vm_offset_t) data_buf + PAGE_SIZE))
 147                 panic("load_coff_section vm_map_remove failed");
 148
 149         return error;
 150 }
 151
 152 static int
 153 coff_load_file(struct thread *td, char *name)
 154 {
 155         struct vmspace *vmspace;
 156         int error;
 157         struct nlookupdata nd;
 158         struct vnode *vp;
 159         struct vattr attr;
 160         struct filehdr *fhdr;
 161         struct aouthdr *ahdr;
 162         struct scnhdr *scns;
 163         char *ptr = 0;
 164         int nscns;
 165         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 166         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 167         unsigned long bss_size = 0;
 168         struct ucred *cred;
 169         int i;
 170
 171         KKASSERT(td->td_proc);
 172         cred = td->td_proc->p_ucred;
 173         vmspace = td->td_proc->p_vmspace;
 174
 175         /* XXX use of 'curthread' should be 'td'?*/
 176         error = nlookup_init(&nd, name, UIO_SYSSPACE, NLC_FOLLOW);
 177         if (error == 0)
 178                 error = nlookup(&nd);
 179         if (error == 0) {
 180                 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp);
 181                 if (error)
 182                         error = ENOEXEC;
 183         }
 184         if (error)
 185                 goto done;
 186
 187         if (vp->v_writecount) {
 188                 error = ETXTBSY;
 189                 goto fail;
 190         }
 191
 192         if ((error = VOP_GETATTR(vp, &attr, td)) != 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, cred, td)) != 0)
 206                 goto fail;
 207
 208         if ((error = VOP_OPEN(vp, FREAD, cred, NULL, td)) != 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, td);
 216
 217         if ((error = vm_mmap(kernel_map,
 218                             (vm_offset_t *) &ptr,
 219                             PAGE_SIZE,
 220                             VM_PROT_READ,
 221                             VM_PROT_READ,
 222                             0,
 223                             (caddr_t) 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, td);
 289  unlocked_fail:
 290         vrele(vp);
 291 done:
 292         nlookup_done(&nd);
 293         return error;
 294 }
 295
 296 static int
 297 exec_coff_imgact(imgp)
 298         struct image_params *imgp;
 299 {
 300         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
 301         const struct aouthdr *ahdr;
 302         const struct scnhdr *scns;
 303         int i;
 304         struct vmspace *vmspace;
 305         int nscns;
 306         int error;
 307         unsigned long text_offset = 0, text_address = 0, text_size = 0;
 308         unsigned long data_offset = 0, data_address = 0, data_size = 0;
 309         unsigned long bss_size = 0;
 310         caddr_t hole;
 311
 312         if (fhdr->f_magic != I386_COFF ||
 313             !(fhdr->f_flags & F_EXEC)) {
 314
 315                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 316                  return -1;
 317         }
 318
 319         nscns = fhdr->f_nscns;
 320         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
 321                 /*
 322                  * For now, return an error -- need to be able to
 323                  * read in all of the section structures.
 324                  */
 325
 326                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
 327                 return -1;
 328         }
 329
 330         ahdr = (const struct aouthdr*)
 331                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
 332         imgp->entry_addr = ahdr->entry;
 333
 334         scns = (const struct scnhdr*)
 335                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
 336                 sizeof(struct aouthdr));
 337
 338         exec_new_vmspace(imgp, NULL);
 339         vmspace = imgp->proc->p_vmspace;
 340
 341         for (i = 0; i < nscns; i++) {
 342
 343           DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
 344                    "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
 345                    scns[i].s_vaddr, scns[i].s_scnptr));
 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(kernel_map,
 373                                     (vm_offset_t *) &buf,
 374                                     len,
 375                                     VM_PROT_READ,
 376                                     VM_PROT_READ,
 377                                     0,
 378                                     (caddr_t) imgp->vp,
 379                                     foff)) != 0) {
 380                         return ENOEXEC;
 381                 }
 382                 if(scns[i].s_size) {
 383                         char *libbuf;
 384                         int emul_path_len = strlen(ibcs2_emul_path);
 385
 386                         libbuf = malloc(MAXPATHLEN + emul_path_len,
 387                                         M_TEMP, M_WAITOK);
 388                         strcpy(libbuf, ibcs2_emul_path);
 389
 390                         for (j = off; j < scns[i].s_size + off; j++) {
 391                                 char *libname;
 392
 393                                 libname = buf + j + 4 * *(long*)(buf + j + 4);
 394                                 j += 4* *(long*)(buf + j);
 395
 396                                 DPRINTF(("%s(%d):  shared library %s\n",
 397                                          __FILE__, __LINE__, libname));
 398                                 strcpy(&libbuf[emul_path_len], libname);
 399                                 error = coff_load_file(imgp->proc->p_thread, libbuf);
 400                                 if (error)
 401                                         error = coff_load_file(
 402                                                     imgp->proc->p_thread,
 403                                                     libname);
 404                                 if (error)
 405                                         break;
 406                         }
 407                         free(libbuf, M_TEMP);
 408                 }
 409                 if (vm_map_remove(kernel_map,
 410                                   (vm_offset_t) buf,
 411                                   (vm_offset_t) buf + len))
 412                         panic("exec_coff_imgact vm_map_remove failed");
 413                 if (error)
 414                         return error;
 415                 }
 416         }
 417         /*
 418          * Map in .text now
 419          */
 420
 421         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
 422                 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
 423                 __FILE__, __LINE__, text_offset, text_address,
 424                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
 425         if ((error = load_coff_section(vmspace, imgp->vp,
 426                                       text_offset,
 427                                       (caddr_t)(void *)(uintptr_t)text_address,
 428                                       text_size, text_size,
 429                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
 430                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 431                 return error;
 432         }
 433         /*
 434          * Map in .data and .bss now
 435          */
 436
 437
 438         DPRINTF(("%s(%d): load_coff_section(vmspace, "
 439                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
 440                 __FILE__, __LINE__, data_offset, data_address,
 441                 data_size + bss_size, data_size, VM_PROT_ALL));
 442         if ((error = load_coff_section(vmspace, imgp->vp,
 443                                       data_offset,
 444                                       (caddr_t)(void *)(uintptr_t)data_address,
 445                                       data_size + bss_size, data_size,
 446                                       VM_PROT_ALL)) != 0) {
 447
 448                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
 449                 return error;
 450         }
 451
 452         imgp->interpreted = 0;
 453         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
 454
 455         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
 456         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
 457         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
 458         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
 459
 460         hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
 461
 462
 463         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
 464                 __FILE__, __LINE__, hole));
 465         DPRINTF(("imgact: error = %d\n", error));
 466
 467         error = vm_map_find(&vmspace->vm_map, NULL, 0,
 468                             (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
 469                                 VM_PROT_ALL, VM_PROT_ALL, 0);
 470
 471         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
 472                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
 473                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
 474         DPRINTF(("%s(%d):  returning successfully!\n", __FILE__, __LINE__));
 475
 476         /* Indicate that this file should not be modified */
 477         imgp->vp->v_flag |= VTEXT;
 478         return 0;
 479 }
 480
 481 /*
 482  * Tell kern_execve.c about it, with a little help from the linker.
 483  */
 484 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
 485 EXEC_SET(coff, coff_execsw);