The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/imgact_coff.c

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    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  * $FreeBSD: releng/5.0/sys/i386/ibcs2/imgact_coff.c 103767 2002-09-21 22:07:17Z jake $
   30  */
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/fcntl.h>
   35 #include <sys/imgact.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mman.h>
   40 #include <sys/mount.h>
   41 #include <sys/namei.h>
   42 #include <sys/vnode.h>
   43 
   44 #include <vm/vm.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 
   50 #include <i386/ibcs2/coff.h>
   51 #include <i386/ibcs2/ibcs2_util.h>
   52 
   53 MODULE_DEPEND(coff, ibcs2, 1, 1, 1);
   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 proc *p = td->td_proc;
  156         struct vmspace *vmspace = p->p_vmspace;
  157         int error;
  158         struct nameidata nd;
  159         struct vnode *vp;
  160         struct vattr attr;
  161         struct filehdr *fhdr;
  162         struct aouthdr *ahdr;
  163         struct scnhdr *scns;
  164         char *ptr = 0;
  165         int nscns;
  166         unsigned long text_offset = 0, text_address = 0, text_size = 0;
  167         unsigned long data_offset = 0, data_address = 0, data_size = 0;
  168         unsigned long bss_size = 0;
  169         int i;
  170 
  171         NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, td);
  172 
  173         error = namei(&nd);
  174         if (error)
  175                 return error;
  176 
  177         vp = nd.ni_vp;
  178         if (vp == NULL)
  179                 return ENOEXEC;
  180 
  181         if (vp->v_writecount) {
  182                 error = ETXTBSY;
  183                 goto fail;
  184         }
  185 
  186         if ((error = VOP_GETATTR(vp, &attr, td->td_ucred, td)) != 0)
  187                 goto fail;
  188 
  189         if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
  190             || ((attr.va_mode & 0111) == 0)
  191             || (attr.va_type != VREG))
  192                 goto fail;
  193 
  194         if (attr.va_size == 0) {
  195                 error = ENOEXEC;
  196                 goto fail;
  197         }
  198 
  199         if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
  200                 goto fail;
  201 
  202         if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td)) != 0)
  203                 goto fail;
  204 
  205         /*
  206          * Lose the lock on the vnode. It's no longer needed, and must not
  207          * exist for the pagefault paging to work below.
  208          */
  209         VOP_UNLOCK(vp, 0, td);
  210 
  211         if ((error = vm_mmap(kernel_map,
  212                             (vm_offset_t *) &ptr,
  213                             PAGE_SIZE,
  214                             VM_PROT_READ,
  215                             VM_PROT_READ,
  216                             0,
  217                             (caddr_t) vp,
  218                             0)) != 0)
  219                 goto unlocked_fail;
  220 
  221         fhdr = (struct filehdr *)ptr;
  222 
  223         if (fhdr->f_magic != I386_COFF) {
  224                 error = ENOEXEC;
  225                 goto dealloc_and_fail;
  226         }
  227 
  228         nscns = fhdr->f_nscns;
  229 
  230         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
  231                 /*
  232                  * XXX -- just fail.  I'm so lazy.
  233                  */
  234                 error = ENOEXEC;
  235                 goto dealloc_and_fail;
  236         }
  237 
  238         ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
  239 
  240         scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
  241                           + sizeof(struct aouthdr));
  242 
  243         for (i = 0; i < nscns; i++) {
  244                 if (scns[i].s_flags & STYP_NOLOAD)
  245                         continue;
  246                 else if (scns[i].s_flags & STYP_TEXT) {
  247                         text_address = scns[i].s_vaddr;
  248                         text_size = scns[i].s_size;
  249                         text_offset = scns[i].s_scnptr;
  250                 }
  251                 else if (scns[i].s_flags & STYP_DATA) {
  252                         data_address = scns[i].s_vaddr;
  253                         data_size = scns[i].s_size;
  254                         data_offset = scns[i].s_scnptr;
  255                 } else if (scns[i].s_flags & STYP_BSS) {
  256                         bss_size = scns[i].s_size;
  257                 }
  258         }
  259 
  260         if ((error = load_coff_section(vmspace, vp, text_offset,
  261                                       (caddr_t)(void *)(uintptr_t)text_address,
  262                                       text_size, text_size,
  263                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
  264                 goto dealloc_and_fail;
  265         }
  266         if ((error = load_coff_section(vmspace, vp, data_offset,
  267                                       (caddr_t)(void *)(uintptr_t)data_address,
  268                                       data_size + bss_size, data_size,
  269                                       VM_PROT_ALL)) != 0) {
  270                 goto dealloc_and_fail;
  271         }
  272 
  273         error = 0;
  274 
  275  dealloc_and_fail:
  276         if (vm_map_remove(kernel_map,
  277                           (vm_offset_t) ptr,
  278                           (vm_offset_t) ptr + PAGE_SIZE))
  279                 panic("%s vm_map_remove failed", __func__);
  280 
  281  fail:
  282         VOP_UNLOCK(vp, 0, td);
  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         caddr_t hole;
  304         struct thread *td = curthread;
  305 
  306         if (fhdr->f_magic != I386_COFF ||
  307             !(fhdr->f_flags & F_EXEC)) {
  308 
  309                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
  310                  return -1;
  311         }
  312 
  313         nscns = fhdr->f_nscns;
  314         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
  315                 /*
  316                  * For now, return an error -- need to be able to
  317                  * read in all of the section structures.
  318                  */
  319 
  320                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
  321                 return -1;
  322         }
  323 
  324         ahdr = (const struct aouthdr*)
  325                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
  326         imgp->entry_addr = ahdr->entry;
  327 
  328         scns = (const struct scnhdr*)
  329                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
  330                 sizeof(struct aouthdr));
  331 
  332         VOP_UNLOCK(imgp->vp, 0, td);
  333 
  334         if ((error = exec_extract_strings(imgp)) != 0) {
  335                 DPRINTF(("%s(%d):  return %d\n", __FILE__, __LINE__, error));
  336                 goto fail;
  337         }
  338 
  339         exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
  340         vmspace = imgp->proc->p_vmspace;
  341 
  342         for (i = 0; i < nscns; i++) {
  343 
  344           DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
  345                    "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
  346                    scns[i].s_vaddr, scns[i].s_scnptr));
  347           if (scns[i].s_flags & STYP_NOLOAD) {
  348                 /*
  349                  * A section that is not loaded, for whatever
  350                  * reason.  It takes precedance over other flag
  351                  * bits...
  352                  */
  353                 continue;
  354           } else if (scns[i].s_flags & STYP_TEXT) {
  355                 text_address = scns[i].s_vaddr;
  356                 text_size = scns[i].s_size;
  357                 text_offset = scns[i].s_scnptr;
  358           } else if (scns[i].s_flags & STYP_DATA) {
  359                 /* .data section */
  360                 data_address = scns[i].s_vaddr;
  361                 data_size = scns[i].s_size;
  362                 data_offset = scns[i].s_scnptr;
  363           } else if (scns[i].s_flags & STYP_BSS) {
  364                 /* .bss section */
  365                 bss_size = scns[i].s_size;
  366           } else if (scns[i].s_flags & STYP_LIB) {
  367                 char *buf = 0;
  368                 int foff = trunc_page(scns[i].s_scnptr);
  369                 int off = scns[i].s_scnptr - foff;
  370                 int len = round_page(scns[i].s_size + PAGE_SIZE);
  371                 int j;
  372 
  373                 if ((error = vm_mmap(kernel_map,
  374                                     (vm_offset_t *) &buf,
  375                                     len,
  376                                     VM_PROT_READ,
  377                                     VM_PROT_READ,
  378                                     0,
  379                                     (caddr_t) imgp->vp,
  380                                     foff)) != 0) {
  381                         error = ENOEXEC;
  382                         goto fail;
  383                 }
  384                 if(scns[i].s_size) {
  385                         char *libbuf;
  386                         int emul_path_len = strlen(ibcs2_emul_path);
  387 
  388                         libbuf = malloc(MAXPATHLEN + emul_path_len,
  389                                         M_TEMP, M_WAITOK);
  390                         strcpy(libbuf, ibcs2_emul_path);
  391 
  392                         for (j = off; j < scns[i].s_size + off;) {
  393                                 long stroff, nextoff;
  394                                 char *libname;
  395 
  396                                 nextoff = 4 * *(long *)(buf + j);
  397                                 stroff = 4 * *(long *)(buf + j + sizeof(long));
  398 
  399                                 libname = buf + j + stroff;
  400                                 j += nextoff;
  401 
  402                                 DPRINTF(("%s(%d):  shared library %s\n",
  403                                          __FILE__, __LINE__, libname));
  404                                 strcpy(&libbuf[emul_path_len], libname);
  405 /* XXXKSE only 1:1 in coff */   error = coff_load_file(
  406                                     FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
  407                                 if (error)
  408                                         error = coff_load_file(
  409                                             FIRST_THREAD_IN_PROC(imgp->proc),
  410                                             libname);
  411                                 if (error)
  412                                         break;
  413                         }
  414                         free(libbuf, M_TEMP);
  415                 }
  416                 if (vm_map_remove(kernel_map,
  417                                   (vm_offset_t) buf,
  418                                   (vm_offset_t) buf + len))
  419                         panic("exec_coff_imgact vm_map_remove failed");
  420                 if (error)
  421                         goto fail;
  422                 }
  423         }
  424         /*
  425          * Map in .text now
  426          */
  427 
  428         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
  429                 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
  430                 __FILE__, __LINE__, text_offset, text_address,
  431                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
  432         if ((error = load_coff_section(vmspace, imgp->vp,
  433                                       text_offset,
  434                                       (caddr_t)(void *)(uintptr_t)text_address,
  435                                       text_size, text_size,
  436                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
  437                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
  438                 goto fail;
  439         }
  440         /*
  441          * Map in .data and .bss now
  442          */
  443 
  444 
  445         DPRINTF(("%s(%d): load_coff_section(vmspace, "
  446                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
  447                 __FILE__, __LINE__, data_offset, data_address,
  448                 data_size + bss_size, data_size, VM_PROT_ALL));
  449         if ((error = load_coff_section(vmspace, imgp->vp,
  450                                       data_offset,
  451                                       (caddr_t)(void *)(uintptr_t)data_address,
  452                                       data_size + bss_size, data_size,
  453                                       VM_PROT_ALL)) != 0) {
  454 
  455                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
  456                 goto fail;
  457         }
  458 
  459         imgp->interpreted = 0;
  460         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
  461 
  462         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
  463         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
  464         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
  465         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
  466 
  467         hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
  468 
  469 
  470         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
  471                 __FILE__, __LINE__, hole));
  472         DPRINTF(("imgact: error = %d\n", error));
  473 
  474         error = vm_map_find(&vmspace->vm_map, NULL, 0,
  475                             (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
  476                                 VM_PROT_ALL, VM_PROT_ALL, 0);
  477 
  478         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
  479                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
  480                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
  481         DPRINTF(("%s(%d):  returning successfully!\n", __FILE__, __LINE__));
  482 
  483 fail:
  484         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
  485 
  486         return error;
  487 }
  488 
  489 /*
  490  * Tell kern_execve.c about it, with a little help from the linker.
  491  */
  492 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
  493 EXEC_SET(coff, coff_execsw);

Cache object: e599142776919f5f3b9b52d69e5759b7


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