The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c

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    1 /*-
    2  * Copyright (c) 2000 David O'Brien
    3  * Copyright (c) 1995-1996 Søren Schmidt
    4  * Copyright (c) 1996 Peter Wemm
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/5.2/sys/kern/imgact_elf.c 120422 2003-09-25 01:10:26Z peter $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/exec.h>
   36 #include <sys/fcntl.h>
   37 #include <sys/imgact.h>
   38 #include <sys/imgact_elf.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mutex.h>
   43 #include <sys/mman.h>
   44 #include <sys/namei.h>
   45 #include <sys/pioctl.h>
   46 #include <sys/proc.h>
   47 #include <sys/procfs.h>
   48 #include <sys/resourcevar.h>
   49 #include <sys/systm.h>
   50 #include <sys/signalvar.h>
   51 #include <sys/stat.h>
   52 #include <sys/sx.h>
   53 #include <sys/syscall.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/sysent.h>
   56 #include <sys/vnode.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/vm_kern.h>
   60 #include <vm/vm_param.h>
   61 #include <vm/pmap.h>
   62 #include <vm/vm_map.h>
   63 #include <vm/vm_object.h>
   64 #include <vm/vm_extern.h>
   65 
   66 #include <machine/elf.h>
   67 #include <machine/md_var.h>
   68 
   69 #define OLD_EI_BRAND    8
   70 
   71 static int __elfN(check_header)(const Elf_Ehdr *hdr);
   72 static Elf_Brandinfo *__elfN(get_brandinfo)(const Elf_Ehdr *hdr,
   73     const char *interp);
   74 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
   75     u_long *entry, size_t pagesize);
   76 static int __elfN(load_section)(struct proc *p,
   77     struct vmspace *vmspace, struct vnode *vp, vm_object_t object,
   78     vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
   79     vm_prot_t prot, size_t pagesize);
   80 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
   81 
   82 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
   83     "");
   84 
   85 int __elfN(fallback_brand) = -1;
   86 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
   87     fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
   88     __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
   89 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
   90     &__elfN(fallback_brand));
   91 
   92 static int elf_trace = 0;
   93 SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, "");
   94 
   95 static int elf_legacy_coredump = 0;
   96 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 
   97     &elf_legacy_coredump, 0, "");
   98 
   99 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
  100 
  101 int
  102 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
  103 {
  104         int i;
  105 
  106         for (i = 0; i < MAX_BRANDS; i++) {
  107                 if (elf_brand_list[i] == NULL) {
  108                         elf_brand_list[i] = entry;
  109                         break;
  110                 }
  111         }
  112         if (i == MAX_BRANDS)
  113                 return (-1);
  114         return (0);
  115 }
  116 
  117 int
  118 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
  119 {
  120         int i;
  121 
  122         for (i = 0; i < MAX_BRANDS; i++) {
  123                 if (elf_brand_list[i] == entry) {
  124                         elf_brand_list[i] = NULL;
  125                         break;
  126                 }
  127         }
  128         if (i == MAX_BRANDS)
  129                 return (-1);
  130         return (0);
  131 }
  132 
  133 int
  134 __elfN(brand_inuse)(Elf_Brandinfo *entry)
  135 {
  136         struct proc *p;
  137         int rval = FALSE;
  138 
  139         sx_slock(&allproc_lock);
  140         LIST_FOREACH(p, &allproc, p_list) {
  141                 if (p->p_sysent == entry->sysvec) {
  142                         rval = TRUE;
  143                         break;
  144                 }
  145         }
  146         sx_sunlock(&allproc_lock);
  147 
  148         return (rval);
  149 }
  150 
  151 static Elf_Brandinfo *
  152 __elfN(get_brandinfo)(const Elf_Ehdr *hdr, const char *interp)
  153 {
  154         Elf_Brandinfo *bi;
  155         int i;
  156 
  157         /*
  158          * We support three types of branding -- (1) the ELF EI_OSABI field
  159          * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
  160          * branding w/in the ELF header, and (3) path of the `interp_path'
  161          * field.  We should also look for an ".note.ABI-tag" ELF section now
  162          * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones.
  163          */
  164 
  165         /* If the executable has a brand, search for it in the brand list. */
  166         for (i = 0; i < MAX_BRANDS; i++) {
  167                 bi = elf_brand_list[i];
  168                 if (bi != NULL && hdr->e_machine == bi->machine &&
  169                     (hdr->e_ident[EI_OSABI] == bi->brand ||
  170                     strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
  171                     bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
  172                         return (bi);
  173         }
  174 
  175         /* Lacking a known brand, search for a recognized interpreter. */
  176         if (interp != NULL) {
  177                 for (i = 0; i < MAX_BRANDS; i++) {
  178                         bi = elf_brand_list[i];
  179                         if (bi != NULL && hdr->e_machine == bi->machine &&
  180                             strcmp(interp, bi->interp_path) == 0)
  181                                 return (bi);
  182                 }
  183         }
  184 
  185         /* Lacking a recognized interpreter, try the default brand */
  186         for (i = 0; i < MAX_BRANDS; i++) {
  187                 bi = elf_brand_list[i];
  188                 if (bi != NULL && hdr->e_machine == bi->machine &&
  189                     __elfN(fallback_brand) == bi->brand)
  190                         return (bi);
  191         }
  192         return (NULL);
  193 }
  194 
  195 static int
  196 __elfN(check_header)(const Elf_Ehdr *hdr)
  197 {
  198         Elf_Brandinfo *bi;
  199         int i;
  200 
  201         if (!IS_ELF(*hdr) ||
  202             hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
  203             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
  204             hdr->e_ident[EI_VERSION] != EV_CURRENT)
  205                 return (ENOEXEC);
  206 
  207         /*
  208          * Make sure we have at least one brand for this machine.
  209          */
  210 
  211         for (i = 0; i < MAX_BRANDS; i++) {
  212                 bi = elf_brand_list[i];
  213                 if (bi != NULL && bi->machine == hdr->e_machine)
  214                         break;
  215         }
  216         if (i == MAX_BRANDS)
  217                 return (ENOEXEC);
  218 
  219         if (hdr->e_version != ELF_TARG_VER)
  220                 return (ENOEXEC);
  221 
  222         return (0);
  223 }
  224 
  225 static int
  226 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
  227         vm_offset_t start, vm_offset_t end, vm_prot_t prot,
  228         vm_prot_t max)
  229 {
  230         int error, rv;
  231         vm_offset_t off;
  232         vm_offset_t data_buf = 0;
  233 
  234         /*
  235          * Create the page if it doesn't exist yet. Ignore errors.
  236          */
  237         vm_map_lock(map);
  238         vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), max,
  239             max, 0);
  240         vm_map_unlock(map);
  241 
  242         /*
  243          * Find the page from the underlying object.
  244          */
  245         if (object) {
  246                 vm_object_reference(object);
  247                 rv = vm_map_find(exec_map,
  248                                  object,
  249                                  trunc_page(offset),
  250                                  &data_buf,
  251                                  PAGE_SIZE,
  252                                  TRUE,
  253                                  VM_PROT_READ,
  254                                  VM_PROT_ALL,
  255                                  MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL);
  256                 if (rv != KERN_SUCCESS) {
  257                         vm_object_deallocate(object);
  258                         return (rv);
  259                 }
  260 
  261                 off = offset - trunc_page(offset);
  262                 error = copyout((caddr_t)data_buf + off, (caddr_t)start,
  263                     end - start);
  264                 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE);
  265                 if (error) {
  266                         return (KERN_FAILURE);
  267                 }
  268         }
  269 
  270         return (KERN_SUCCESS);
  271 }
  272 
  273 static int
  274 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
  275         vm_offset_t start, vm_offset_t end, vm_prot_t prot,
  276         vm_prot_t max, int cow)
  277 {
  278         vm_offset_t data_buf, off;
  279         vm_size_t sz;
  280         int error, rv;
  281 
  282         if (start != trunc_page(start)) {
  283                 rv = __elfN(map_partial)(map, object, offset, start,
  284                     round_page(start), prot, max);
  285                 if (rv)
  286                         return (rv);
  287                 offset += round_page(start) - start;
  288                 start = round_page(start);
  289         }
  290         if (end != round_page(end)) {
  291                 rv = __elfN(map_partial)(map, object, offset +
  292                     trunc_page(end) - start, trunc_page(end), end, prot, max);
  293                 if (rv)
  294                         return (rv);
  295                 end = trunc_page(end);
  296         }
  297         if (end > start) {
  298                 if (offset & PAGE_MASK) {
  299                         /*
  300                          * The mapping is not page aligned. This means we have
  301                          * to copy the data. Sigh.
  302                          */
  303                         rv = vm_map_find(map, 0, 0, &start, end - start,
  304                             FALSE, prot, max, 0);
  305                         if (rv)
  306                                 return (rv);
  307                         data_buf = 0;
  308                         while (start < end) {
  309                                 vm_object_reference(object);
  310                                 rv = vm_map_find(exec_map,
  311                                                  object,
  312                                                  trunc_page(offset),
  313                                                  &data_buf,
  314                                                  2 * PAGE_SIZE,
  315                                                  TRUE,
  316                                                  VM_PROT_READ,
  317                                                  VM_PROT_ALL,
  318                                                  (MAP_COPY_ON_WRITE
  319                                                   | MAP_PREFAULT_PARTIAL));
  320                                 if (rv != KERN_SUCCESS) {
  321                                         vm_object_deallocate(object);
  322                                         return (rv);
  323                                 }
  324                                 off = offset - trunc_page(offset);
  325                                 sz = end - start;
  326                                 if (sz > PAGE_SIZE)
  327                                         sz = PAGE_SIZE;
  328                                 error = copyout((caddr_t)data_buf + off,
  329                                     (caddr_t)start, sz);
  330                                 vm_map_remove(exec_map, data_buf,
  331                                     data_buf + 2 * PAGE_SIZE);
  332                                 if (error) {
  333                                         return (KERN_FAILURE);
  334                                 }
  335                                 start += sz;
  336                         }
  337                         rv = KERN_SUCCESS;
  338                 } else {
  339                         vm_map_lock(map);
  340                         rv = vm_map_insert(map, object, offset, start, end,
  341                             prot, max, cow);
  342                         vm_map_unlock(map);
  343                 }
  344                 return (rv);
  345         } else {
  346                 return (KERN_SUCCESS);
  347         }
  348 }
  349 
  350 static int
  351 __elfN(load_section)(struct proc *p, struct vmspace *vmspace,
  352         struct vnode *vp, vm_object_t object, vm_offset_t offset,
  353         caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
  354         size_t pagesize)
  355 {
  356         size_t map_len;
  357         vm_offset_t map_addr;
  358         int error, rv, cow;
  359         size_t copy_len;
  360         vm_offset_t file_addr;
  361         vm_offset_t data_buf = 0;
  362 
  363         GIANT_REQUIRED;
  364 
  365         error = 0;
  366 
  367         /*
  368          * It's necessary to fail if the filsz + offset taken from the
  369          * header is greater than the actual file pager object's size.
  370          * If we were to allow this, then the vm_map_find() below would
  371          * walk right off the end of the file object and into the ether.
  372          *
  373          * While I'm here, might as well check for something else that
  374          * is invalid: filsz cannot be greater than memsz.
  375          */
  376         if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
  377             filsz > memsz) {
  378                 uprintf("elf_load_section: truncated ELF file\n");
  379                 return (ENOEXEC);
  380         }
  381 
  382 #define trunc_page_ps(va, ps)   ((va) & ~(ps - 1))
  383 #define round_page_ps(va, ps)   (((va) + (ps - 1)) & ~(ps - 1))
  384 
  385         map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
  386         file_addr = trunc_page_ps(offset, pagesize);
  387 
  388         /*
  389          * We have two choices.  We can either clear the data in the last page
  390          * of an oversized mapping, or we can start the anon mapping a page
  391          * early and copy the initialized data into that first page.  We
  392          * choose the second..
  393          */
  394         if (memsz > filsz)
  395                 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
  396         else
  397                 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
  398 
  399         if (map_len != 0) {
  400                 vm_object_reference(object);
  401 
  402                 /* cow flags: don't dump readonly sections in core */
  403                 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
  404                     (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
  405 
  406                 rv = __elfN(map_insert)(&vmspace->vm_map,
  407                                       object,
  408                                       file_addr,        /* file offset */
  409                                       map_addr,         /* virtual start */
  410                                       map_addr + map_len,/* virtual end */
  411                                       prot,
  412                                       VM_PROT_ALL,
  413                                       cow);
  414                 if (rv != KERN_SUCCESS) {
  415                         vm_object_deallocate(object);
  416                         return (EINVAL);
  417                 }
  418 
  419                 /* we can stop now if we've covered it all */
  420                 if (memsz == filsz) {
  421                         return (0);
  422                 }
  423         }
  424 
  425 
  426         /*
  427          * We have to get the remaining bit of the file into the first part
  428          * of the oversized map segment.  This is normally because the .data
  429          * segment in the file is extended to provide bss.  It's a neat idea
  430          * to try and save a page, but it's a pain in the behind to implement.
  431          */
  432         copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
  433         map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
  434         map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
  435             map_addr;
  436 
  437         /* This had damn well better be true! */
  438         if (map_len != 0) {
  439                 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr,
  440                     map_addr + map_len, VM_PROT_ALL, VM_PROT_ALL, 0);
  441                 if (rv != KERN_SUCCESS) {
  442                         return (EINVAL);
  443                 }
  444         }
  445 
  446         if (copy_len != 0) {
  447                 vm_offset_t off;
  448                 vm_object_reference(object);
  449                 rv = vm_map_find(exec_map,
  450                                  object,
  451                                  trunc_page(offset + filsz),
  452                                  &data_buf,
  453                                  PAGE_SIZE,
  454                                  TRUE,
  455                                  VM_PROT_READ,
  456                                  VM_PROT_ALL,
  457                                  MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL);
  458                 if (rv != KERN_SUCCESS) {
  459                         vm_object_deallocate(object);
  460                         return (EINVAL);
  461                 }
  462 
  463                 /* send the page fragment to user space */
  464                 off = trunc_page_ps(offset + filsz, pagesize) -
  465                     trunc_page(offset + filsz);
  466                 error = copyout((caddr_t)data_buf + off, (caddr_t)map_addr,
  467                     copy_len);
  468                 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE);
  469                 if (error) {
  470                         return (error);
  471                 }
  472         }
  473 
  474         /*
  475          * set it to the specified protection.
  476          * XXX had better undo the damage from pasting over the cracks here!
  477          */
  478         vm_map_protect(&vmspace->vm_map, trunc_page(map_addr),
  479             round_page(map_addr + map_len),  prot, FALSE);
  480 
  481         return (error);
  482 }
  483 
  484 /*
  485  * Load the file "file" into memory.  It may be either a shared object
  486  * or an executable.
  487  *
  488  * The "addr" reference parameter is in/out.  On entry, it specifies
  489  * the address where a shared object should be loaded.  If the file is
  490  * an executable, this value is ignored.  On exit, "addr" specifies
  491  * where the file was actually loaded.
  492  *
  493  * The "entry" reference parameter is out only.  On exit, it specifies
  494  * the entry point for the loaded file.
  495  */
  496 static int
  497 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
  498         u_long *entry, size_t pagesize)
  499 {
  500         struct {
  501                 struct nameidata nd;
  502                 struct vattr attr;
  503                 struct image_params image_params;
  504         } *tempdata;
  505         const Elf_Ehdr *hdr = NULL;
  506         const Elf_Phdr *phdr = NULL;
  507         struct nameidata *nd;
  508         struct vmspace *vmspace = p->p_vmspace;
  509         struct vattr *attr;
  510         struct image_params *imgp;
  511         vm_prot_t prot;
  512         u_long rbase;
  513         u_long base_addr = 0;
  514         int error, i, numsegs;
  515 
  516         if (curthread->td_proc != p)
  517                 panic("elf_load_file - thread");        /* XXXKSE DIAGNOSTIC */
  518 
  519         tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
  520         nd = &tempdata->nd;
  521         attr = &tempdata->attr;
  522         imgp = &tempdata->image_params;
  523 
  524         /*
  525          * Initialize part of the common data
  526          */
  527         imgp->proc = p;
  528         imgp->userspace_argv = NULL;
  529         imgp->userspace_envv = NULL;
  530         imgp->attr = attr;
  531         imgp->firstpage = NULL;
  532         imgp->image_header = (char *)kmem_alloc_wait(exec_map, PAGE_SIZE);
  533         imgp->object = NULL;
  534         imgp->execlabel = NULL;
  535 
  536         if (imgp->image_header == NULL) {
  537                 nd->ni_vp = NULL;
  538                 error = ENOMEM;
  539                 goto fail;
  540         }
  541 
  542         /* XXXKSE */
  543         NDINIT(nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, curthread);
  544 
  545         if ((error = namei(nd)) != 0) {
  546                 nd->ni_vp = NULL;
  547                 goto fail;
  548         }
  549         NDFREE(nd, NDF_ONLY_PNBUF);
  550         imgp->vp = nd->ni_vp;
  551 
  552         /*
  553          * Check permissions, modes, uid, etc on the file, and "open" it.
  554          */
  555         error = exec_check_permissions(imgp);
  556         if (error) {
  557                 VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */
  558                 goto fail;
  559         }
  560 
  561         error = exec_map_first_page(imgp);
  562         /*
  563          * Also make certain that the interpreter stays the same, so set
  564          * its VV_TEXT flag, too.
  565          */
  566         if (error == 0)
  567                 nd->ni_vp->v_vflag |= VV_TEXT;
  568 
  569         VOP_GETVOBJECT(nd->ni_vp, &imgp->object);
  570         vm_object_reference(imgp->object);
  571 
  572         VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */
  573         if (error)
  574                 goto fail;
  575 
  576         hdr = (const Elf_Ehdr *)imgp->image_header;
  577         if ((error = __elfN(check_header)(hdr)) != 0)
  578                 goto fail;
  579         if (hdr->e_type == ET_DYN)
  580                 rbase = *addr;
  581         else if (hdr->e_type == ET_EXEC)
  582                 rbase = 0;
  583         else {
  584                 error = ENOEXEC;
  585                 goto fail;
  586         }
  587 
  588         /* Only support headers that fit within first page for now */
  589         if ((hdr->e_phoff > PAGE_SIZE) ||
  590             (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
  591                 error = ENOEXEC;
  592                 goto fail;
  593         }
  594 
  595         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
  596 
  597         for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
  598                 if (phdr[i].p_type == PT_LOAD) {        /* Loadable segment */
  599                         prot = 0;
  600                         if (phdr[i].p_flags & PF_X)
  601                                 prot |= VM_PROT_EXECUTE;
  602                         if (phdr[i].p_flags & PF_W)
  603                                 prot |= VM_PROT_WRITE;
  604                         if (phdr[i].p_flags & PF_R)
  605                                 prot |= VM_PROT_READ;
  606 
  607                         if ((error = __elfN(load_section)(p, vmspace,
  608                             nd->ni_vp, imgp->object, phdr[i].p_offset,
  609                             (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
  610                             phdr[i].p_memsz, phdr[i].p_filesz, prot,
  611                             pagesize)) != 0)
  612                                 goto fail;
  613                         /*
  614                          * Establish the base address if this is the
  615                          * first segment.
  616                          */
  617                         if (numsegs == 0)
  618                                 base_addr = trunc_page(phdr[i].p_vaddr +
  619                                     rbase);
  620                         numsegs++;
  621                 }
  622         }
  623         *addr = base_addr;
  624         *entry = (unsigned long)hdr->e_entry + rbase;
  625 
  626 fail:
  627         if (imgp->firstpage)
  628                 exec_unmap_first_page(imgp);
  629         if (imgp->image_header)
  630                 kmem_free_wakeup(exec_map, (vm_offset_t)imgp->image_header,
  631                     PAGE_SIZE);
  632         if (imgp->object)
  633                 vm_object_deallocate(imgp->object);
  634 
  635         if (nd->ni_vp)
  636                 vrele(nd->ni_vp);
  637 
  638         free(tempdata, M_TEMP);
  639 
  640         return (error);
  641 }
  642 
  643 static int
  644 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
  645 {
  646         const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
  647         const Elf_Phdr *phdr;
  648         Elf_Auxargs *elf_auxargs = NULL;
  649         struct vmspace *vmspace;
  650         vm_prot_t prot;
  651         u_long text_size = 0, data_size = 0, total_size = 0;
  652         u_long text_addr = 0, data_addr = 0;
  653         u_long seg_size, seg_addr;
  654         u_long addr, entry = 0, proghdr = 0;
  655         int error, i;
  656         const char *interp = NULL;
  657         Elf_Brandinfo *brand_info;
  658         char *path;
  659         struct thread *td = curthread;
  660         struct sysentvec *sv;
  661 
  662         GIANT_REQUIRED;
  663 
  664         /*
  665          * Do we have a valid ELF header ?
  666          */
  667         if (__elfN(check_header)(hdr) != 0 || hdr->e_type != ET_EXEC)
  668                 return (-1);
  669 
  670         /*
  671          * From here on down, we return an errno, not -1, as we've
  672          * detected an ELF file.
  673          */
  674 
  675         if ((hdr->e_phoff > PAGE_SIZE) ||
  676             (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
  677                 /* Only support headers in first page for now */
  678                 return (ENOEXEC);
  679         }
  680         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
  681 
  682         /*
  683          * From this point on, we may have resources that need to be freed.
  684          */
  685 
  686         VOP_UNLOCK(imgp->vp, 0, td);
  687 
  688         for (i = 0; i < hdr->e_phnum; i++) {
  689                 switch (phdr[i].p_type) {
  690                 case PT_INTERP: /* Path to interpreter */
  691                         if (phdr[i].p_filesz > MAXPATHLEN ||
  692                             phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
  693                                 error = ENOEXEC;
  694                                 goto fail;
  695                         }
  696                         interp = imgp->image_header + phdr[i].p_offset;
  697                         break;
  698                 default:
  699                         break;
  700                 }
  701         }
  702 
  703         brand_info = __elfN(get_brandinfo)(hdr, interp);
  704         if (brand_info == NULL) {
  705                 uprintf("ELF binary type \"%u\" not known.\n",
  706                     hdr->e_ident[EI_OSABI]);
  707                 error = ENOEXEC;
  708                 goto fail;
  709         }
  710         sv = brand_info->sysvec;
  711 
  712         if ((error = exec_extract_strings(imgp)) != 0)
  713                 goto fail;
  714 
  715         exec_new_vmspace(imgp, sv);
  716 
  717         vmspace = imgp->proc->p_vmspace;
  718 
  719         for (i = 0; i < hdr->e_phnum; i++) {
  720                 switch (phdr[i].p_type) {
  721                 case PT_LOAD:   /* Loadable segment */
  722                         prot = 0;
  723                         if (phdr[i].p_flags & PF_X)
  724                                 prot |= VM_PROT_EXECUTE;
  725                         if (phdr[i].p_flags & PF_W)
  726                                 prot |= VM_PROT_WRITE;
  727                         if (phdr[i].p_flags & PF_R)
  728                                 prot |= VM_PROT_READ;
  729 
  730 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER)
  731                         /*
  732                          * Some x86 binaries assume read == executable,
  733                          * notably the M3 runtime and therefore cvsup
  734                          */
  735                         if (prot & VM_PROT_READ)
  736                                 prot |= VM_PROT_EXECUTE;
  737 #endif
  738 
  739                         if ((error = __elfN(load_section)(imgp->proc, vmspace,
  740                             imgp->vp, imgp->object, phdr[i].p_offset,
  741                             (caddr_t)(uintptr_t)phdr[i].p_vaddr,
  742                             phdr[i].p_memsz, phdr[i].p_filesz, prot,
  743                             sv->sv_pagesize)) != 0)
  744                                 goto fail;
  745 
  746                         seg_addr = trunc_page(phdr[i].p_vaddr);
  747                         seg_size = round_page(phdr[i].p_memsz +
  748                             phdr[i].p_vaddr - seg_addr);
  749 
  750                         /*
  751                          * Is this .text or .data?  We can't use
  752                          * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
  753                          * alpha terribly and possibly does other bad
  754                          * things so we stick to the old way of figuring
  755                          * it out:  If the segment contains the program
  756                          * entry point, it's a text segment, otherwise it
  757                          * is a data segment.
  758                          *
  759                          * Note that obreak() assumes that data_addr + 
  760                          * data_size == end of data load area, and the ELF
  761                          * file format expects segments to be sorted by
  762                          * address.  If multiple data segments exist, the
  763                          * last one will be used.
  764                          */
  765                         if (hdr->e_entry >= phdr[i].p_vaddr &&
  766                             hdr->e_entry < (phdr[i].p_vaddr +
  767                             phdr[i].p_memsz)) {
  768                                 text_size = seg_size;
  769                                 text_addr = seg_addr;
  770                                 entry = (u_long)hdr->e_entry;
  771                         } else {
  772                                 data_size = seg_size;
  773                                 data_addr = seg_addr;
  774                         }
  775                         total_size += seg_size;
  776                         break;
  777                 case PT_PHDR:   /* Program header table info */
  778                         proghdr = phdr[i].p_vaddr;
  779                         break;
  780                 default:
  781                         break;
  782                 }
  783         }
  784         
  785         if (data_addr == 0 && data_size == 0) {
  786                 data_addr = text_addr;
  787                 data_size = text_size;
  788         }
  789 
  790         /*
  791          * Check limits.  It should be safe to check the
  792          * limits after loading the segments since we do
  793          * not actually fault in all the segments pages.
  794          */
  795         if (data_size >
  796             imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
  797             text_size > maxtsiz ||
  798             total_size >
  799             imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
  800                 error = ENOMEM;
  801                 goto fail;
  802         }
  803 
  804         vmspace->vm_tsize = text_size >> PAGE_SHIFT;
  805         vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
  806         vmspace->vm_dsize = data_size >> PAGE_SHIFT;
  807         vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
  808 
  809         /*
  810          * We load the dynamic linker where a userland call
  811          * to mmap(0, ...) would put it.  The rationale behind this
  812          * calculation is that it leaves room for the heap to grow to
  813          * its maximum allowed size.
  814          */
  815         addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr +
  816             imgp->proc->p_rlimit[RLIMIT_DATA].rlim_max);
  817 
  818         imgp->entry_addr = entry;
  819 
  820         imgp->proc->p_sysent = sv;
  821         if (interp != NULL) {
  822                 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
  823                 snprintf(path, MAXPATHLEN, "%s%s", brand_info->emul_path,
  824                     interp);
  825                 if ((error = __elfN(load_file)(imgp->proc, path, &addr,
  826                     &imgp->entry_addr, sv->sv_pagesize)) != 0) {
  827                         if ((error = __elfN(load_file)(imgp->proc, interp,
  828                             &addr, &imgp->entry_addr, sv->sv_pagesize)) != 0) {
  829                                 uprintf("ELF interpreter %s not found\n",
  830                                     path);
  831                                 free(path, M_TEMP);
  832                                 goto fail;
  833                         }
  834                 }
  835                 free(path, M_TEMP);
  836         }
  837 
  838         /*
  839          * Construct auxargs table (used by the fixup routine)
  840          */
  841         elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
  842         elf_auxargs->execfd = -1;
  843         elf_auxargs->phdr = proghdr;
  844         elf_auxargs->phent = hdr->e_phentsize;
  845         elf_auxargs->phnum = hdr->e_phnum;
  846         elf_auxargs->pagesz = PAGE_SIZE;
  847         elf_auxargs->base = addr;
  848         elf_auxargs->flags = 0;
  849         elf_auxargs->entry = entry;
  850         elf_auxargs->trace = elf_trace;
  851 
  852         imgp->auxargs = elf_auxargs;
  853         imgp->interpreted = 0;
  854 
  855 fail:
  856         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
  857         return (error);
  858 }
  859 
  860 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
  861 
  862 int
  863 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
  864 {
  865         Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
  866         Elf_Addr *base;
  867         Elf_Addr *pos;
  868 
  869         base = (Elf_Addr *)*stack_base;
  870         pos = base + (imgp->argc + imgp->envc + 2);
  871 
  872         if (args->trace) {
  873                 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
  874         }
  875         if (args->execfd != -1) {
  876                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  877         }
  878         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  879         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  880         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  881         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  882         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  883         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  884         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  885         AUXARGS_ENTRY(pos, AT_NULL, 0);
  886 
  887         free(imgp->auxargs, M_TEMP);
  888         imgp->auxargs = NULL;
  889 
  890         base--;
  891         suword(base, (long)imgp->argc);
  892         *stack_base = (register_t *)base;
  893         return (0);
  894 }
  895 
  896 /*
  897  * Code for generating ELF core dumps.
  898  */
  899 
  900 typedef void (*segment_callback)(vm_map_entry_t, void *);
  901 
  902 /* Closure for cb_put_phdr(). */
  903 struct phdr_closure {
  904         Elf_Phdr *phdr;         /* Program header to fill in */
  905         Elf_Off offset;         /* Offset of segment in core file */
  906 };
  907 
  908 /* Closure for cb_size_segment(). */
  909 struct sseg_closure {
  910         int count;              /* Count of writable segments. */
  911         size_t size;            /* Total size of all writable segments. */
  912 };
  913 
  914 static void cb_put_phdr(vm_map_entry_t, void *);
  915 static void cb_size_segment(vm_map_entry_t, void *);
  916 static void each_writable_segment(struct proc *, segment_callback, void *);
  917 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
  918     int, void *, size_t);
  919 static void __elfN(puthdr)(struct proc *, void *, size_t *,
  920     const prstatus_t *, const prfpregset_t *, const prpsinfo_t *, int);
  921 static void __elfN(putnote)(void *, size_t *, const char *, int,
  922     const void *, size_t);
  923 
  924 extern int osreldate;
  925 
  926 int
  927 __elfN(coredump)(td, vp, limit)
  928         struct thread *td;
  929         register struct vnode *vp;
  930         off_t limit;
  931 {
  932         register struct proc *p = td->td_proc;
  933         register struct ucred *cred = td->td_ucred;
  934         int error = 0;
  935         struct sseg_closure seginfo;
  936         void *hdr;
  937         size_t hdrsize;
  938 
  939         /* Size the program segments. */
  940         seginfo.count = 0;
  941         seginfo.size = 0;
  942         each_writable_segment(p, cb_size_segment, &seginfo);
  943 
  944         /*
  945          * Calculate the size of the core file header area by making
  946          * a dry run of generating it.  Nothing is written, but the
  947          * size is calculated.
  948          */
  949         hdrsize = 0;
  950         __elfN(puthdr)((struct proc *)NULL, (void *)NULL, &hdrsize,
  951             (const prstatus_t *)NULL, (const prfpregset_t *)NULL,
  952             (const prpsinfo_t *)NULL, seginfo.count);
  953 
  954         if (hdrsize + seginfo.size >= limit)
  955                 return (EFAULT);
  956 
  957         /*
  958          * Allocate memory for building the header, fill it up,
  959          * and write it out.
  960          */
  961         hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
  962         if (hdr == NULL) {
  963                 return (EINVAL);
  964         }
  965         error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize);
  966 
  967         /* Write the contents of all of the writable segments. */
  968         if (error == 0) {
  969                 Elf_Phdr *php;
  970                 off_t offset;
  971                 int i;
  972 
  973                 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
  974                 offset = hdrsize;
  975                 for (i = 0; i < seginfo.count; i++) {
  976                         error = vn_rdwr_inchunks(UIO_WRITE, vp,
  977                             (caddr_t)(uintptr_t)php->p_vaddr,
  978                             php->p_filesz, offset, UIO_USERSPACE,
  979                             IO_UNIT | IO_DIRECT, cred, NOCRED, (int *)NULL,
  980                             curthread); /* XXXKSE */
  981                         if (error != 0)
  982                                 break;
  983                         offset += php->p_filesz;
  984                         php++;
  985                 }
  986         }
  987         free(hdr, M_TEMP);
  988 
  989         return (error);
  990 }
  991 
  992 /*
  993  * A callback for each_writable_segment() to write out the segment's
  994  * program header entry.
  995  */
  996 static void
  997 cb_put_phdr(entry, closure)
  998         vm_map_entry_t entry;
  999         void *closure;
 1000 {
 1001         struct phdr_closure *phc = (struct phdr_closure *)closure;
 1002         Elf_Phdr *phdr = phc->phdr;
 1003 
 1004         phc->offset = round_page(phc->offset);
 1005 
 1006         phdr->p_type = PT_LOAD;
 1007         phdr->p_offset = phc->offset;
 1008         phdr->p_vaddr = entry->start;
 1009         phdr->p_paddr = 0;
 1010         phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
 1011         phdr->p_align = PAGE_SIZE;
 1012         phdr->p_flags = 0;
 1013         if (entry->protection & VM_PROT_READ)
 1014                 phdr->p_flags |= PF_R;
 1015         if (entry->protection & VM_PROT_WRITE)
 1016                 phdr->p_flags |= PF_W;
 1017         if (entry->protection & VM_PROT_EXECUTE)
 1018                 phdr->p_flags |= PF_X;
 1019 
 1020         phc->offset += phdr->p_filesz;
 1021         phc->phdr++;
 1022 }
 1023 
 1024 /*
 1025  * A callback for each_writable_segment() to gather information about
 1026  * the number of segments and their total size.
 1027  */
 1028 static void
 1029 cb_size_segment(entry, closure)
 1030         vm_map_entry_t entry;
 1031         void *closure;
 1032 {
 1033         struct sseg_closure *ssc = (struct sseg_closure *)closure;
 1034 
 1035         ssc->count++;
 1036         ssc->size += entry->end - entry->start;
 1037 }
 1038 
 1039 /*
 1040  * For each writable segment in the process's memory map, call the given
 1041  * function with a pointer to the map entry and some arbitrary
 1042  * caller-supplied data.
 1043  */
 1044 static void
 1045 each_writable_segment(p, func, closure)
 1046         struct proc *p;
 1047         segment_callback func;
 1048         void *closure;
 1049 {
 1050         vm_map_t map = &p->p_vmspace->vm_map;
 1051         vm_map_entry_t entry;
 1052 
 1053         for (entry = map->header.next; entry != &map->header;
 1054             entry = entry->next) {
 1055                 vm_object_t obj;
 1056 
 1057                 /*
 1058                  * Don't dump inaccessible mappings, deal with legacy
 1059                  * coredump mode.
 1060                  *
 1061                  * Note that read-only segments related to the elf binary
 1062                  * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
 1063                  * need to arbitrarily ignore such segments.
 1064                  */
 1065                 if (elf_legacy_coredump) {
 1066                         if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
 1067                                 continue;
 1068                 } else {
 1069                         if ((entry->protection & VM_PROT_ALL) == 0)
 1070                                 continue;
 1071                 }
 1072 
 1073                 /*
 1074                  * Dont include memory segment in the coredump if
 1075                  * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
 1076                  * madvise(2).  Do not dump submaps (i.e. parts of the
 1077                  * kernel map).
 1078                  */
 1079                 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
 1080                         continue;
 1081 
 1082                 if ((obj = entry->object.vm_object) == NULL)
 1083                         continue;
 1084 
 1085                 /* Find the deepest backing object. */
 1086                 while (obj->backing_object != NULL)
 1087                         obj = obj->backing_object;
 1088 
 1089                 /* Ignore memory-mapped devices and such things. */
 1090                 if (obj->type != OBJT_DEFAULT &&
 1091                     obj->type != OBJT_SWAP &&
 1092                     obj->type != OBJT_VNODE)
 1093                         continue;
 1094 
 1095                 (*func)(entry, closure);
 1096         }
 1097 }
 1098 
 1099 /*
 1100  * Write the core file header to the file, including padding up to
 1101  * the page boundary.
 1102  */
 1103 static int
 1104 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize)
 1105         struct thread *td;
 1106         struct vnode *vp;
 1107         struct ucred *cred;
 1108         int numsegs;
 1109         size_t hdrsize;
 1110         void *hdr;
 1111 {
 1112         struct {
 1113                 prstatus_t status;
 1114                 prfpregset_t fpregset;
 1115                 prpsinfo_t psinfo;
 1116         } *tempdata;
 1117         struct proc *p = td->td_proc;
 1118         size_t off;
 1119         prstatus_t *status;
 1120         prfpregset_t *fpregset;
 1121         prpsinfo_t *psinfo;
 1122 
 1123         tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK);
 1124         status = &tempdata->status;
 1125         fpregset = &tempdata->fpregset;
 1126         psinfo = &tempdata->psinfo;
 1127 
 1128         /* Gather the information for the header. */
 1129         status->pr_version = PRSTATUS_VERSION;
 1130         status->pr_statussz = sizeof(prstatus_t);
 1131         status->pr_gregsetsz = sizeof(gregset_t);
 1132         status->pr_fpregsetsz = sizeof(fpregset_t);
 1133         status->pr_osreldate = osreldate;
 1134         status->pr_cursig = p->p_sig;
 1135         status->pr_pid = p->p_pid;
 1136         fill_regs(td, &status->pr_reg);
 1137 
 1138         fill_fpregs(td, fpregset);
 1139 
 1140         psinfo->pr_version = PRPSINFO_VERSION;
 1141         psinfo->pr_psinfosz = sizeof(prpsinfo_t);
 1142         strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
 1143 
 1144         /* XXX - We don't fill in the command line arguments properly yet. */
 1145         strlcpy(psinfo->pr_psargs, p->p_comm, sizeof(psinfo->pr_psargs));
 1146 
 1147         /* Fill in the header. */
 1148         bzero(hdr, hdrsize);
 1149         off = 0;
 1150         __elfN(puthdr)(p, hdr, &off, status, fpregset, psinfo, numsegs);
 1151 
 1152         free(tempdata, M_TEMP);
 1153 
 1154         /* Write it to the core file. */
 1155         return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
 1156             UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
 1157             td)); /* XXXKSE */
 1158 }
 1159 
 1160 static void
 1161 __elfN(puthdr)(struct proc *p, void *dst, size_t *off, const prstatus_t *status,
 1162     const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs)
 1163 {
 1164         size_t ehoff;
 1165         size_t phoff;
 1166         size_t noteoff;
 1167         size_t notesz;
 1168 
 1169         ehoff = *off;
 1170         *off += sizeof(Elf_Ehdr);
 1171 
 1172         phoff = *off;
 1173         *off += (numsegs + 1) * sizeof(Elf_Phdr);
 1174 
 1175         noteoff = *off;
 1176         __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
 1177             sizeof *status);
 1178         __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
 1179             sizeof *fpregset);
 1180         __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
 1181             sizeof *psinfo);
 1182         notesz = *off - noteoff;
 1183 
 1184         /* Align up to a page boundary for the program segments. */
 1185         *off = round_page(*off);
 1186 
 1187         if (dst != NULL) {
 1188                 Elf_Ehdr *ehdr;
 1189                 Elf_Phdr *phdr;
 1190                 struct phdr_closure phc;
 1191 
 1192                 /*
 1193                  * Fill in the ELF header.
 1194                  */
 1195                 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
 1196                 ehdr->e_ident[EI_MAG0] = ELFMAG0;
 1197                 ehdr->e_ident[EI_MAG1] = ELFMAG1;
 1198                 ehdr->e_ident[EI_MAG2] = ELFMAG2;
 1199                 ehdr->e_ident[EI_MAG3] = ELFMAG3;
 1200                 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
 1201                 ehdr->e_ident[EI_DATA] = ELF_DATA;
 1202                 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
 1203                 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 1204                 ehdr->e_ident[EI_ABIVERSION] = 0;
 1205                 ehdr->e_ident[EI_PAD] = 0;
 1206                 ehdr->e_type = ET_CORE;
 1207                 ehdr->e_machine = ELF_ARCH;
 1208                 ehdr->e_version = EV_CURRENT;
 1209                 ehdr->e_entry = 0;
 1210                 ehdr->e_phoff = phoff;
 1211                 ehdr->e_flags = 0;
 1212                 ehdr->e_ehsize = sizeof(Elf_Ehdr);
 1213                 ehdr->e_phentsize = sizeof(Elf_Phdr);
 1214                 ehdr->e_phnum = numsegs + 1;
 1215                 ehdr->e_shentsize = sizeof(Elf_Shdr);
 1216                 ehdr->e_shnum = 0;
 1217                 ehdr->e_shstrndx = SHN_UNDEF;
 1218 
 1219                 /*
 1220                  * Fill in the program header entries.
 1221                  */
 1222                 phdr = (Elf_Phdr *)((char *)dst + phoff);
 1223 
 1224                 /* The note segement. */
 1225                 phdr->p_type = PT_NOTE;
 1226                 phdr->p_offset = noteoff;
 1227                 phdr->p_vaddr = 0;
 1228                 phdr->p_paddr = 0;
 1229                 phdr->p_filesz = notesz;
 1230                 phdr->p_memsz = 0;
 1231                 phdr->p_flags = 0;
 1232                 phdr->p_align = 0;
 1233                 phdr++;
 1234 
 1235                 /* All the writable segments from the program. */
 1236                 phc.phdr = phdr;
 1237                 phc.offset = *off;
 1238                 each_writable_segment(p, cb_put_phdr, &phc);
 1239         }
 1240 }
 1241 
 1242 static void
 1243 __elfN(putnote)(void *dst, size_t *off, const char *name, int type,
 1244     const void *desc, size_t descsz)
 1245 {
 1246         Elf_Note note;
 1247 
 1248         note.n_namesz = strlen(name) + 1;
 1249         note.n_descsz = descsz;
 1250         note.n_type = type;
 1251         if (dst != NULL)
 1252                 bcopy(&note, (char *)dst + *off, sizeof note);
 1253         *off += sizeof note;
 1254         if (dst != NULL)
 1255                 bcopy(name, (char *)dst + *off, note.n_namesz);
 1256         *off += roundup2(note.n_namesz, sizeof(Elf_Size));
 1257         if (dst != NULL)
 1258                 bcopy(desc, (char *)dst + *off, note.n_descsz);
 1259         *off += roundup2(note.n_descsz, sizeof(Elf_Size));
 1260 }
 1261 
 1262 /*
 1263  * Tell kern_execve.c about it, with a little help from the linker.
 1264  */
 1265 static struct execsw __elfN(execsw) = {
 1266         __CONCAT(exec_, __elfN(imgact)),
 1267         __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
 1268 };
 1269 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));

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