2 * Copyright (c) 1995-1996 Søren Schmidt
3 * Copyright (c) 1996 Peter Wemm
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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
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.
29 * $FreeBSD: src/sys/kern/imgact_elf.c,v 1.73.2.13 2002/12/28 19:49:41 dillon Exp $
30 * $DragonFly: src/sys/kern/imgact_elf.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
33 #include <sys/param.h>
35 #include <sys/fcntl.h>
36 #include <sys/imgact.h>
37 #include <sys/imgact_elf.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
41 #include <sys/namei.h>
42 #include <sys/pioctl.h>
44 #include <sys/procfs.h>
45 #include <sys/resourcevar.h>
46 #include <sys/signalvar.h>
48 #include <sys/syscall.h>
49 #include <sys/sysctl.h>
50 #include <sys/sysent.h>
51 #include <sys/systm.h>
52 #include <sys/vnode.h>
55 #include <vm/vm_kern.h>
56 #include <vm/vm_param.h>
59 #include <vm/vm_map.h>
60 #include <vm/vm_object.h>
61 #include <vm/vm_extern.h>
63 #include <machine/elf.h>
64 #include <machine/md_var.h>
66 #define OLD_EI_BRAND 8
71 static int elf_check_header __P((const Elf_Ehdr *hdr));
72 static int elf_freebsd_fixup __P((register_t **stack_base,
73 struct image_params *imgp));
74 static int elf_load_file __P((struct proc *p, const char *file, u_long *addr,
76 static int elf_load_section __P((struct proc *p,
77 struct vmspace *vmspace, struct vnode *vp,
78 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
80 static int exec_elf_imgact __P((struct image_params *imgp));
82 static int elf_trace = 0;
83 SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, "");
84 static int elf_legacy_coredump = 0;
85 SYSCTL_INT(_debug, OID_AUTO, elf_legacy_coredump, CTLFLAG_RW,
86 &elf_legacy_coredump, 0, "");
88 static struct sysentvec elf_freebsd_sysvec = {
108 static Elf_Brandinfo freebsd_brand_info = {
112 "/usr/libexec/ld-elf.so.1",
115 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = {
118 NULL, NULL, NULL, NULL
122 elf_insert_brand_entry(Elf_Brandinfo *entry)
126 for (i=1; i<MAX_BRANDS; i++) {
127 if (elf_brand_list[i] == NULL) {
128 elf_brand_list[i] = entry;
138 elf_remove_brand_entry(Elf_Brandinfo *entry)
142 for (i=1; i<MAX_BRANDS; i++) {
143 if (elf_brand_list[i] == entry) {
144 elf_brand_list[i] = NULL;
154 elf_brand_inuse(Elf_Brandinfo *entry)
159 LIST_FOREACH(p, &allproc, p_list) {
160 if (p->p_sysent == entry->sysvec) {
170 elf_check_header(const Elf_Ehdr *hdr)
173 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
174 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
175 hdr->e_ident[EI_VERSION] != EV_CURRENT)
178 if (!ELF_MACHINE_OK(hdr->e_machine))
181 if (hdr->e_version != ELF_TARG_VER)
188 elf_load_section(struct proc *p, struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
191 vm_offset_t map_addr;
195 vm_offset_t file_addr;
196 vm_offset_t data_buf = 0;
198 VOP_GETVOBJECT(vp, &object);
202 * It's necessary to fail if the filsz + offset taken from the
203 * header is greater than the actual file pager object's size.
204 * If we were to allow this, then the vm_map_find() below would
205 * walk right off the end of the file object and into the ether.
207 * While I'm here, might as well check for something else that
208 * is invalid: filsz cannot be greater than memsz.
210 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
212 uprintf("elf_load_section: truncated ELF file\n");
216 map_addr = trunc_page((vm_offset_t)vmaddr);
217 file_addr = trunc_page(offset);
220 * We have two choices. We can either clear the data in the last page
221 * of an oversized mapping, or we can start the anon mapping a page
222 * early and copy the initialized data into that first page. We
223 * choose the second..
226 map_len = trunc_page(offset+filsz) - file_addr;
228 map_len = round_page(offset+filsz) - file_addr;
231 vm_object_reference(object);
233 /* cow flags: don't dump readonly sections in core */
234 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
235 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
237 vm_map_lock(&vmspace->vm_map);
238 rv = vm_map_insert(&vmspace->vm_map,
240 file_addr, /* file offset */
241 map_addr, /* virtual start */
242 map_addr + map_len,/* virtual end */
246 vm_map_unlock(&vmspace->vm_map);
247 if (rv != KERN_SUCCESS) {
248 vm_object_deallocate(object);
252 /* we can stop now if we've covered it all */
253 if (memsz == filsz) {
260 * We have to get the remaining bit of the file into the first part
261 * of the oversized map segment. This is normally because the .data
262 * segment in the file is extended to provide bss. It's a neat idea
263 * to try and save a page, but it's a pain in the behind to implement.
265 copy_len = (offset + filsz) - trunc_page(offset + filsz);
266 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
267 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
269 /* This had damn well better be true! */
271 vm_map_lock(&vmspace->vm_map);
272 rv = vm_map_insert(&vmspace->vm_map, NULL, 0,
273 map_addr, map_addr + map_len,
274 VM_PROT_ALL, VM_PROT_ALL, 0);
275 vm_map_unlock(&vmspace->vm_map);
276 if (rv != KERN_SUCCESS) {
282 vm_object_reference(object);
283 rv = vm_map_find(exec_map,
285 trunc_page(offset + filsz),
291 MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL);
292 if (rv != KERN_SUCCESS) {
293 vm_object_deallocate(object);
297 /* send the page fragment to user space */
298 error = copyout((caddr_t)data_buf, (caddr_t)map_addr, copy_len);
299 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE);
306 * set it to the specified protection
308 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot,
315 * Load the file "file" into memory. It may be either a shared object
318 * The "addr" reference parameter is in/out. On entry, it specifies
319 * the address where a shared object should be loaded. If the file is
320 * an executable, this value is ignored. On exit, "addr" specifies
321 * where the file was actually loaded.
323 * The "entry" reference parameter is out only. On exit, it specifies
324 * the entry point for the loaded file.
327 elf_load_file(struct proc *p, const char *file, u_long *addr, u_long *entry)
332 struct image_params image_params;
334 const Elf_Ehdr *hdr = NULL;
335 const Elf_Phdr *phdr = NULL;
336 struct nameidata *nd;
337 struct vmspace *vmspace = p->p_vmspace;
339 struct image_params *imgp;
342 u_long base_addr = 0;
343 int error, i, numsegs;
345 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
347 attr = &tempdata->attr;
348 imgp = &tempdata->image_params;
351 * Initialize part of the common data
356 imgp->firstpage = NULL;
357 imgp->image_header = (char *)kmem_alloc_wait(exec_map, PAGE_SIZE);
359 if (imgp->image_header == NULL) {
365 NDINIT(nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, p);
367 if ((error = namei(nd)) != 0) {
371 NDFREE(nd, NDF_ONLY_PNBUF);
372 imgp->vp = nd->ni_vp;
375 * Check permissions, modes, uid, etc on the file, and "open" it.
377 error = exec_check_permissions(imgp);
379 VOP_UNLOCK(nd->ni_vp, 0, p);
383 error = exec_map_first_page(imgp);
385 * Also make certain that the interpreter stays the same, so set
386 * its VTEXT flag, too.
389 nd->ni_vp->v_flag |= VTEXT;
390 VOP_UNLOCK(nd->ni_vp, 0, p);
394 hdr = (const Elf_Ehdr *)imgp->image_header;
395 if ((error = elf_check_header(hdr)) != 0)
397 if (hdr->e_type == ET_DYN)
399 else if (hdr->e_type == ET_EXEC)
406 /* Only support headers that fit within first page for now */
407 if ((hdr->e_phoff > PAGE_SIZE) ||
408 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
413 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
415 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
416 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */
418 if (phdr[i].p_flags & PF_X)
419 prot |= VM_PROT_EXECUTE;
420 if (phdr[i].p_flags & PF_W)
421 prot |= VM_PROT_WRITE;
422 if (phdr[i].p_flags & PF_R)
423 prot |= VM_PROT_READ;
425 if ((error = elf_load_section(p, vmspace, nd->ni_vp,
427 (caddr_t)phdr[i].p_vaddr +
430 phdr[i].p_filesz, prot)) != 0)
433 * Establish the base address if this is the
437 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
442 *entry=(unsigned long)hdr->e_entry + rbase;
446 exec_unmap_first_page(imgp);
447 if (imgp->image_header)
448 kmem_free_wakeup(exec_map, (vm_offset_t)imgp->image_header,
453 free(tempdata, M_TEMP);
459 * non static, as it can be overridden by start_init()
461 int fallback_elf_brand = -1;
462 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
463 &fallback_elf_brand, -1,
464 "ELF brand of last resort");
467 exec_elf_imgact(struct image_params *imgp)
469 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
470 const Elf_Phdr *phdr;
471 Elf_Auxargs *elf_auxargs = NULL;
472 struct vmspace *vmspace;
474 u_long text_size = 0, data_size = 0, total_size = 0;
475 u_long text_addr = 0, data_addr = 0;
476 u_long seg_size, seg_addr;
477 u_long addr, entry = 0, proghdr = 0;
479 const char *interp = NULL;
480 Elf_Brandinfo *brand_info;
484 * Do we have a valid ELF header ?
486 if (elf_check_header(hdr) != 0 || hdr->e_type != ET_EXEC)
490 * From here on down, we return an errno, not -1, as we've
491 * detected an ELF file.
494 if ((hdr->e_phoff > PAGE_SIZE) ||
495 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
496 /* Only support headers in first page for now */
499 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff);
502 * From this point on, we may have resources that need to be freed.
505 if ((error = exec_extract_strings(imgp)) != 0)
508 exec_new_vmspace(imgp);
511 * Yeah, I'm paranoid. There is every reason in the world to get
512 * VTEXT now since from here on out, there are places we can have
513 * a context switch. Better safe than sorry; I really don't want
514 * the file to change while it's being loaded.
516 simple_lock(&imgp->vp->v_interlock);
517 imgp->vp->v_flag |= VTEXT;
518 simple_unlock(&imgp->vp->v_interlock);
520 vmspace = imgp->proc->p_vmspace;
522 for (i = 0; i < hdr->e_phnum; i++) {
523 switch(phdr[i].p_type) {
525 case PT_LOAD: /* Loadable segment */
527 if (phdr[i].p_flags & PF_X)
528 prot |= VM_PROT_EXECUTE;
529 if (phdr[i].p_flags & PF_W)
530 prot |= VM_PROT_WRITE;
531 if (phdr[i].p_flags & PF_R)
532 prot |= VM_PROT_READ;
534 if ((error = elf_load_section(imgp->proc,
537 (caddr_t)phdr[i].p_vaddr,
539 phdr[i].p_filesz, prot)) != 0)
542 seg_addr = trunc_page(phdr[i].p_vaddr);
543 seg_size = round_page(phdr[i].p_memsz +
544 phdr[i].p_vaddr - seg_addr);
547 * Is this .text or .data? We can't use
548 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
549 * alpha terribly and possibly does other bad
550 * things so we stick to the old way of figuring
551 * it out: If the segment contains the program
552 * entry point, it's a text segment, otherwise it
555 * Note that obreak() assumes that data_addr +
556 * data_size == end of data load area, and the ELF
557 * file format expects segments to be sorted by
558 * address. If multiple data segments exist, the
559 * last one will be used.
561 if (hdr->e_entry >= phdr[i].p_vaddr &&
562 hdr->e_entry < (phdr[i].p_vaddr +
564 text_size = seg_size;
565 text_addr = seg_addr;
566 entry = (u_long)hdr->e_entry;
568 data_size = seg_size;
569 data_addr = seg_addr;
571 total_size += seg_size;
574 * Check limits. It should be safe to check the
575 * limits after loading the segment since we do
576 * not actually fault in all the segment's pages.
579 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
580 text_size > maxtsiz ||
582 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
587 case PT_INTERP: /* Path to interpreter */
588 if (phdr[i].p_filesz > MAXPATHLEN ||
589 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
593 interp = imgp->image_header + phdr[i].p_offset;
595 case PT_PHDR: /* Program header table info */
596 proghdr = phdr[i].p_vaddr;
603 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
604 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
605 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
606 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
608 addr = ELF_RTLD_ADDR(vmspace);
610 imgp->entry_addr = entry;
614 /* We support three types of branding -- (1) the ELF EI_OSABI field
615 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
616 * branding w/in the ELF header, and (3) path of the `interp_path'
617 * field. We should also look for an ".note.ABI-tag" ELF section now
618 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones.
621 /* If the executable has a brand, search for it in the brand list. */
622 if (brand_info == NULL) {
623 for (i = 0; i < MAX_BRANDS; i++) {
624 Elf_Brandinfo *bi = elf_brand_list[i];
627 (hdr->e_ident[EI_OSABI] == bi->brand
629 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
630 bi->compat_3_brand, strlen(bi->compat_3_brand)))) {
637 /* Lacking a known brand, search for a recognized interpreter. */
638 if (brand_info == NULL && interp != NULL) {
639 for (i = 0; i < MAX_BRANDS; i++) {
640 Elf_Brandinfo *bi = elf_brand_list[i];
643 strcmp(interp, bi->interp_path) == 0) {
650 /* Lacking a recognized interpreter, try the default brand */
651 if (brand_info == NULL) {
652 for (i = 0; i < MAX_BRANDS; i++) {
653 Elf_Brandinfo *bi = elf_brand_list[i];
655 if (bi != NULL && fallback_elf_brand == bi->brand) {
662 if (brand_info == NULL) {
663 uprintf("ELF binary type \"%u\" not known.\n",
664 hdr->e_ident[EI_OSABI]);
669 imgp->proc->p_sysent = brand_info->sysvec;
670 if (interp != NULL) {
671 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
672 snprintf(path, MAXPATHLEN, "%s%s",
673 brand_info->emul_path, interp);
674 if ((error = elf_load_file(imgp->proc, path, &addr,
675 &imgp->entry_addr)) != 0) {
676 if ((error = elf_load_file(imgp->proc, interp, &addr,
677 &imgp->entry_addr)) != 0) {
678 uprintf("ELF interpreter %s not found\n", path);
687 * Construct auxargs table (used by the fixup routine)
689 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
690 elf_auxargs->execfd = -1;
691 elf_auxargs->phdr = proghdr;
692 elf_auxargs->phent = hdr->e_phentsize;
693 elf_auxargs->phnum = hdr->e_phnum;
694 elf_auxargs->pagesz = PAGE_SIZE;
695 elf_auxargs->base = addr;
696 elf_auxargs->flags = 0;
697 elf_auxargs->entry = entry;
698 elf_auxargs->trace = elf_trace;
700 imgp->auxargs = elf_auxargs;
701 imgp->interpreted = 0;
708 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp)
710 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
713 pos = *stack_base + (imgp->argc + imgp->envc + 2);
716 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
718 if (args->execfd != -1) {
719 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
721 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
722 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
723 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
724 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
725 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
726 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
727 AUXARGS_ENTRY(pos, AT_BASE, args->base);
728 AUXARGS_ENTRY(pos, AT_NULL, 0);
730 free(imgp->auxargs, M_TEMP);
731 imgp->auxargs = NULL;
734 suword(*stack_base, (long) imgp->argc);
739 * Code for generating ELF core dumps.
742 typedef void (*segment_callback) __P((vm_map_entry_t, void *));
744 /* Closure for cb_put_phdr(). */
745 struct phdr_closure {
746 Elf_Phdr *phdr; /* Program header to fill in */
747 Elf_Off offset; /* Offset of segment in core file */
750 /* Closure for cb_size_segment(). */
751 struct sseg_closure {
752 int count; /* Count of writable segments. */
753 size_t size; /* Total size of all writable segments. */
756 static void cb_put_phdr __P((vm_map_entry_t, void *));
757 static void cb_size_segment __P((vm_map_entry_t, void *));
758 static void each_writable_segment __P((struct proc *, segment_callback,
760 static int elf_corehdr __P((struct proc *, struct vnode *, struct ucred *,
761 int, void *, size_t));
762 static void elf_puthdr __P((struct proc *, void *, size_t *,
763 const prstatus_t *, const prfpregset_t *, const prpsinfo_t *, int));
764 static void elf_putnote __P((void *, size_t *, const char *, int,
765 const void *, size_t));
767 extern int osreldate;
770 elf_coredump(p, vp, limit)
771 register struct proc *p;
772 register struct vnode *vp;
775 register struct ucred *cred = p->p_ucred;
777 struct sseg_closure seginfo;
781 /* Size the program segments. */
784 each_writable_segment(p, cb_size_segment, &seginfo);
787 * Calculate the size of the core file header area by making
788 * a dry run of generating it. Nothing is written, but the
789 * size is calculated.
792 elf_puthdr((struct proc *)NULL, (void *)NULL, &hdrsize,
793 (const prstatus_t *)NULL, (const prfpregset_t *)NULL,
794 (const prpsinfo_t *)NULL, seginfo.count);
796 if (hdrsize + seginfo.size >= limit)
800 * Allocate memory for building the header, fill it up,
803 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
807 error = elf_corehdr(p, vp, cred, seginfo.count, hdr, hdrsize);
809 /* Write the contents of all of the writable segments. */
815 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
817 for (i = 0; i < seginfo.count; i++) {
818 error = vn_rdwr_inchunks(UIO_WRITE, vp,
819 (caddr_t)php->p_vaddr,
820 php->p_filesz, offset, UIO_USERSPACE,
821 IO_UNIT | IO_DIRECT, cred, (int *)NULL, p);
824 offset += php->p_filesz;
834 * A callback for each_writable_segment() to write out the segment's
835 * program header entry.
838 cb_put_phdr(entry, closure)
839 vm_map_entry_t entry;
842 struct phdr_closure *phc = (struct phdr_closure *)closure;
843 Elf_Phdr *phdr = phc->phdr;
845 phc->offset = round_page(phc->offset);
847 phdr->p_type = PT_LOAD;
848 phdr->p_offset = phc->offset;
849 phdr->p_vaddr = entry->start;
851 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
852 phdr->p_align = PAGE_SIZE;
854 if (entry->protection & VM_PROT_READ)
855 phdr->p_flags |= PF_R;
856 if (entry->protection & VM_PROT_WRITE)
857 phdr->p_flags |= PF_W;
858 if (entry->protection & VM_PROT_EXECUTE)
859 phdr->p_flags |= PF_X;
861 phc->offset += phdr->p_filesz;
866 * A callback for each_writable_segment() to gather information about
867 * the number of segments and their total size.
870 cb_size_segment(entry, closure)
871 vm_map_entry_t entry;
874 struct sseg_closure *ssc = (struct sseg_closure *)closure;
877 ssc->size += entry->end - entry->start;
881 * For each writable segment in the process's memory map, call the given
882 * function with a pointer to the map entry and some arbitrary
883 * caller-supplied data.
886 each_writable_segment(p, func, closure)
888 segment_callback func;
891 vm_map_t map = &p->p_vmspace->vm_map;
892 vm_map_entry_t entry;
894 for (entry = map->header.next; entry != &map->header;
895 entry = entry->next) {
899 * Don't dump inaccessible mappings, deal with legacy
902 * Note that read-only segments related to the elf binary
903 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
904 * need to arbitrarily ignore such segments.
906 if (elf_legacy_coredump) {
907 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
910 if ((entry->protection & VM_PROT_ALL) == 0)
915 * Dont include memory segment in the coredump if
916 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
917 * madvise(2). Do not dump submaps (i.e. parts of the
920 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
923 if ((obj = entry->object.vm_object) == NULL)
926 /* Find the deepest backing object. */
927 while (obj->backing_object != NULL)
928 obj = obj->backing_object;
930 /* Ignore memory-mapped devices and such things. */
931 if (obj->type != OBJT_DEFAULT &&
932 obj->type != OBJT_SWAP &&
933 obj->type != OBJT_VNODE)
936 (*func)(entry, closure);
941 * Write the core file header to the file, including padding up to
945 elf_corehdr(p, vp, cred, numsegs, hdr, hdrsize)
955 prfpregset_t fpregset;
960 prfpregset_t *fpregset;
963 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO | M_WAITOK);
964 status = &tempdata->status;
965 fpregset = &tempdata->fpregset;
966 psinfo = &tempdata->psinfo;
968 /* Gather the information for the header. */
969 status->pr_version = PRSTATUS_VERSION;
970 status->pr_statussz = sizeof(prstatus_t);
971 status->pr_gregsetsz = sizeof(gregset_t);
972 status->pr_fpregsetsz = sizeof(fpregset_t);
973 status->pr_osreldate = osreldate;
974 status->pr_cursig = p->p_sig;
975 status->pr_pid = p->p_pid;
976 fill_regs(p, &status->pr_reg);
978 fill_fpregs(p, fpregset);
980 psinfo->pr_version = PRPSINFO_VERSION;
981 psinfo->pr_psinfosz = sizeof(prpsinfo_t);
982 strncpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname) - 1);
984 /* XXX - We don't fill in the command line arguments properly yet. */
985 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ);
987 /* Fill in the header. */
990 elf_puthdr(p, hdr, &off, status, fpregset, psinfo, numsegs);
992 free(tempdata, M_TEMP);
994 /* Write it to the core file. */
995 return vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
996 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NULL, p);
1000 elf_puthdr(struct proc *p, void *dst, size_t *off, const prstatus_t *status,
1001 const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs)
1009 *off += sizeof(Elf_Ehdr);
1012 *off += (numsegs + 1) * sizeof(Elf_Phdr);
1015 elf_putnote(dst, off, "FreeBSD", NT_PRSTATUS, status,
1017 elf_putnote(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
1019 elf_putnote(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
1021 notesz = *off - noteoff;
1023 /* Align up to a page boundary for the program segments. */
1024 *off = round_page(*off);
1029 struct phdr_closure phc;
1032 * Fill in the ELF header.
1034 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
1035 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1036 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1037 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1038 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1039 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1040 ehdr->e_ident[EI_DATA] = ELF_DATA;
1041 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1042 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1043 ehdr->e_ident[EI_ABIVERSION] = 0;
1044 ehdr->e_ident[EI_PAD] = 0;
1045 ehdr->e_type = ET_CORE;
1046 ehdr->e_machine = ELF_ARCH;
1047 ehdr->e_version = EV_CURRENT;
1049 ehdr->e_phoff = phoff;
1051 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1052 ehdr->e_phentsize = sizeof(Elf_Phdr);
1053 ehdr->e_phnum = numsegs + 1;
1054 ehdr->e_shentsize = sizeof(Elf_Shdr);
1056 ehdr->e_shstrndx = SHN_UNDEF;
1059 * Fill in the program header entries.
1061 phdr = (Elf_Phdr *)((char *)dst + phoff);
1063 /* The note segement. */
1064 phdr->p_type = PT_NOTE;
1065 phdr->p_offset = noteoff;
1068 phdr->p_filesz = notesz;
1074 /* All the writable segments from the program. */
1077 each_writable_segment(p, cb_put_phdr, &phc);
1082 elf_putnote(void *dst, size_t *off, const char *name, int type,
1083 const void *desc, size_t descsz)
1087 note.n_namesz = strlen(name) + 1;
1088 note.n_descsz = descsz;
1091 bcopy(¬e, (char *)dst + *off, sizeof note);
1092 *off += sizeof note;
1094 bcopy(name, (char *)dst + *off, note.n_namesz);
1095 *off += roundup2(note.n_namesz, sizeof(Elf_Size));
1097 bcopy(desc, (char *)dst + *off, note.n_descsz);
1098 *off += roundup2(note.n_descsz, sizeof(Elf_Size));
1102 * Tell kern_execve.c about it, with a little help from the linker.
1104 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"};
1105 EXEC_SET(elf, elf_execsw);