1 /* binfmt_elf_fdpic.c: FDPIC ELF binary format
3 * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * Derived from binfmt_elf.c
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
16 #include <linux/stat.h>
17 #include <linux/sched.h>
19 #include <linux/mman.h>
20 #include <linux/errno.h>
21 #include <linux/signal.h>
22 #include <linux/binfmts.h>
23 #include <linux/string.h>
24 #include <linux/file.h>
25 #include <linux/fcntl.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/highmem.h>
29 #include <linux/highuid.h>
30 #include <linux/personality.h>
31 #include <linux/ptrace.h>
32 #include <linux/init.h>
33 #include <linux/smp_lock.h>
34 #include <linux/elf.h>
35 #include <linux/elf-fdpic.h>
36 #include <linux/elfcore.h>
37 #include <linux/vs_base.h>
38 #include <linux/vs_cvirt.h>
40 #include <asm/uaccess.h>
41 #include <asm/param.h>
42 #include <asm/pgalloc.h>
44 typedef char *elf_caddr_t;
46 #define elf_addr_t unsigned long
50 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
52 #define kdebug(fmt, ...) do {} while(0)
56 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
58 #define kdcore(fmt, ...) do {} while(0)
61 MODULE_LICENSE("GPL");
63 static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
64 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
65 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
66 struct mm_struct *, const char *);
68 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
69 struct elf_fdpic_params *,
70 struct elf_fdpic_params *);
73 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
75 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
80 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
81 struct file *, struct mm_struct *);
83 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
84 static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *);
87 static struct linux_binfmt elf_fdpic_format = {
88 .module = THIS_MODULE,
89 .load_binary = load_elf_fdpic_binary,
90 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
91 .core_dump = elf_fdpic_core_dump,
93 .min_coredump = ELF_EXEC_PAGESIZE,
96 static int __init init_elf_fdpic_binfmt(void)
98 return register_binfmt(&elf_fdpic_format);
101 static void __exit exit_elf_fdpic_binfmt(void)
103 unregister_binfmt(&elf_fdpic_format);
106 core_initcall(init_elf_fdpic_binfmt);
107 module_exit(exit_elf_fdpic_binfmt);
109 static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
111 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
113 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
115 if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr))
117 if (!file->f_op || !file->f_op->mmap)
122 /*****************************************************************************/
124 * read the program headers table into memory
126 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
129 struct elf32_phdr *phdr;
133 if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
135 if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
138 size = params->hdr.e_phnum * sizeof(struct elf_phdr);
139 params->phdrs = kmalloc(size, GFP_KERNEL);
143 retval = kernel_read(file, params->hdr.e_phoff,
144 (char *) params->phdrs, size);
148 /* determine stack size for this binary */
149 phdr = params->phdrs;
150 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
151 if (phdr->p_type != PT_GNU_STACK)
154 if (phdr->p_flags & PF_X)
155 params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
157 params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
159 params->stack_size = phdr->p_memsz;
166 /*****************************************************************************/
168 * load an fdpic binary into various bits of memory
170 static int load_elf_fdpic_binary(struct linux_binprm *bprm,
171 struct pt_regs *regs)
173 struct elf_fdpic_params exec_params, interp_params;
174 struct elf_phdr *phdr;
175 unsigned long stack_size, entryaddr;
177 unsigned long fullsize;
179 #ifdef ELF_FDPIC_PLAT_INIT
180 unsigned long dynaddr;
182 struct file *interpreter = NULL; /* to shut gcc up */
183 char *interpreter_name = NULL;
184 int executable_stack;
187 memset(&exec_params, 0, sizeof(exec_params));
188 memset(&interp_params, 0, sizeof(interp_params));
190 exec_params.hdr = *(struct elfhdr *) bprm->buf;
191 exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
193 /* check that this is a binary we know how to deal with */
195 if (!is_elf_fdpic(&exec_params.hdr, bprm->file))
198 /* read the program header table */
199 retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
203 /* scan for a program header that specifies an interpreter */
204 phdr = exec_params.phdrs;
206 for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
207 switch (phdr->p_type) {
210 if (phdr->p_filesz > PATH_MAX)
213 if (phdr->p_filesz < 2)
216 /* read the name of the interpreter into memory */
217 interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
218 if (!interpreter_name)
221 retval = kernel_read(bprm->file,
229 if (interpreter_name[phdr->p_filesz - 1] != '\0')
232 kdebug("Using ELF interpreter %s", interpreter_name);
234 /* replace the program with the interpreter */
235 interpreter = open_exec(interpreter_name);
236 retval = PTR_ERR(interpreter);
237 if (IS_ERR(interpreter)) {
242 retval = kernel_read(interpreter, 0, bprm->buf,
247 interp_params.hdr = *((struct elfhdr *) bprm->buf);
252 if (exec_params.load_addr == 0)
253 exec_params.load_addr = phdr->p_vaddr;
260 if (elf_check_const_displacement(&exec_params.hdr))
261 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
263 /* perform insanity checks on the interpreter */
264 if (interpreter_name) {
266 if (!is_elf_fdpic(&interp_params.hdr, interpreter))
269 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
271 /* read the interpreter's program header table */
272 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
277 stack_size = exec_params.stack_size;
278 if (stack_size < interp_params.stack_size)
279 stack_size = interp_params.stack_size;
281 if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
282 executable_stack = EXSTACK_ENABLE_X;
283 else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
284 executable_stack = EXSTACK_DISABLE_X;
285 else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
286 executable_stack = EXSTACK_ENABLE_X;
287 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
288 executable_stack = EXSTACK_DISABLE_X;
290 executable_stack = EXSTACK_DEFAULT;
296 if (elf_check_const_displacement(&interp_params.hdr))
297 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
299 /* flush all traces of the currently running executable */
300 retval = flush_old_exec(bprm);
304 /* there's now no turning back... the old userspace image is dead,
305 * defunct, deceased, etc. after this point we have to exit via
307 set_personality(PER_LINUX_FDPIC);
308 set_binfmt(&elf_fdpic_format);
310 current->mm->start_code = 0;
311 current->mm->end_code = 0;
312 current->mm->start_stack = 0;
313 current->mm->start_data = 0;
314 current->mm->end_data = 0;
315 current->mm->context.exec_fdpic_loadmap = 0;
316 current->mm->context.interp_fdpic_loadmap = 0;
318 current->flags &= ~PF_FORKNOEXEC;
321 elf_fdpic_arch_lay_out_mm(&exec_params,
323 ¤t->mm->start_stack,
324 ¤t->mm->start_brk);
326 retval = setup_arg_pages(bprm, current->mm->start_stack,
329 send_sig(SIGKILL, current, 0);
334 /* load the executable and interpreter into memory */
335 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
340 if (interpreter_name) {
341 retval = elf_fdpic_map_file(&interp_params, interpreter,
342 current->mm, "interpreter");
344 printk(KERN_ERR "Unable to load interpreter\n");
348 allow_write_access(interpreter);
354 if (!current->mm->start_brk)
355 current->mm->start_brk = current->mm->end_data;
357 current->mm->brk = current->mm->start_brk =
358 PAGE_ALIGN(current->mm->start_brk);
361 /* create a stack and brk area big enough for everyone
362 * - the brk heap starts at the bottom and works up
363 * - the stack starts at the top and works down
365 stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
366 if (stack_size < PAGE_SIZE * 2)
367 stack_size = PAGE_SIZE * 2;
369 down_write(¤t->mm->mmap_sem);
370 current->mm->start_brk = do_mmap(NULL, 0, stack_size,
371 PROT_READ | PROT_WRITE | PROT_EXEC,
372 MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN,
375 if (IS_ERR_VALUE(current->mm->start_brk)) {
376 up_write(¤t->mm->mmap_sem);
377 retval = current->mm->start_brk;
378 current->mm->start_brk = 0;
382 /* expand the stack mapping to use up the entire allocation granule */
383 fullsize = ksize((char *) current->mm->start_brk);
384 if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
386 stack_size = fullsize;
387 up_write(¤t->mm->mmap_sem);
389 current->mm->brk = current->mm->start_brk;
390 current->mm->context.end_brk = current->mm->start_brk;
391 current->mm->context.end_brk +=
392 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
393 current->mm->start_stack = current->mm->start_brk + stack_size;
397 current->flags &= ~PF_FORKNOEXEC;
398 if (create_elf_fdpic_tables(bprm, current->mm,
399 &exec_params, &interp_params) < 0)
402 kdebug("- start_code %lx", current->mm->start_code);
403 kdebug("- end_code %lx", current->mm->end_code);
404 kdebug("- start_data %lx", current->mm->start_data);
405 kdebug("- end_data %lx", current->mm->end_data);
406 kdebug("- start_brk %lx", current->mm->start_brk);
407 kdebug("- brk %lx", current->mm->brk);
408 kdebug("- start_stack %lx", current->mm->start_stack);
410 #ifdef ELF_FDPIC_PLAT_INIT
412 * The ABI may specify that certain registers be set up in special
413 * ways (on i386 %edx is the address of a DT_FINI function, for
414 * example. This macro performs whatever initialization to
415 * the regs structure is required.
417 dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
418 ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
422 /* everything is now ready... get the userspace context ready to roll */
423 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
424 start_thread(regs, entryaddr, current->mm->start_stack);
430 allow_write_access(interpreter);
433 kfree(interpreter_name);
434 kfree(exec_params.phdrs);
435 kfree(exec_params.loadmap);
436 kfree(interp_params.phdrs);
437 kfree(interp_params.loadmap);
440 /* unrecoverable error - kill the process */
442 send_sig(SIGSEGV, current, 0);
447 /*****************************************************************************/
449 * present useful information to the program
451 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
452 struct mm_struct *mm,
453 struct elf_fdpic_params *exec_params,
454 struct elf_fdpic_params *interp_params)
456 unsigned long sp, csp, nitems;
457 elf_caddr_t __user *argv, *envp;
458 size_t platform_len = 0, len;
460 char __user *u_platform, *p;
464 /* we're going to shovel a whole load of stuff onto the stack */
468 sp = mm->start_stack;
470 /* stack the program arguments and environment */
471 if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
475 /* get hold of platform and hardware capabilities masks for the machine
476 * we are running on. In some cases (Sparc), this info is impossible
477 * to get, in others (i386) it is merely difficult.
480 k_platform = ELF_PLATFORM;
484 platform_len = strlen(k_platform) + 1;
486 u_platform = (char __user *) sp;
487 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
491 #if defined(__i386__) && defined(CONFIG_SMP)
492 /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
493 * by the processes running on the same package. One thing we can do is
494 * to shuffle the initial stack for them.
496 * the conditionals here are unneeded, but kept in to make the code
497 * behaviour the same as pre change unless we have hyperthreaded
498 * processors. This keeps Mr Marcelo Person happier but should be
501 if (smp_num_siblings > 1)
502 sp = sp - ((current->pid % 64) << 7);
507 /* stack the load map(s) */
508 len = sizeof(struct elf32_fdpic_loadmap);
509 len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
510 sp = (sp - len) & ~7UL;
511 exec_params->map_addr = sp;
513 if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
516 current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
518 if (interp_params->loadmap) {
519 len = sizeof(struct elf32_fdpic_loadmap);
520 len += sizeof(struct elf32_fdpic_loadseg) *
521 interp_params->loadmap->nsegs;
522 sp = (sp - len) & ~7UL;
523 interp_params->map_addr = sp;
525 if (copy_to_user((void __user *) sp, interp_params->loadmap,
529 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
532 /* force 16 byte _final_ alignment here for generality */
533 #define DLINFO_ITEMS 13
535 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0);
536 #ifdef DLINFO_ARCH_ITEMS
537 nitems += DLINFO_ARCH_ITEMS;
541 sp -= nitems * 2 * sizeof(unsigned long);
542 sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */
543 sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */
544 sp -= 1 * sizeof(unsigned long); /* argc */
549 /* put the ELF interpreter info on the stack */
550 #define NEW_AUX_ENT(nr, id, val) \
552 struct { unsigned long _id, _val; } __user *ent; \
554 ent = (void __user *) csp; \
555 __put_user((id), &ent[nr]._id); \
556 __put_user((val), &ent[nr]._val); \
559 csp -= 2 * sizeof(unsigned long);
560 NEW_AUX_ENT(0, AT_NULL, 0);
562 csp -= 2 * sizeof(unsigned long);
563 NEW_AUX_ENT(0, AT_PLATFORM,
564 (elf_addr_t) (unsigned long) u_platform);
567 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
568 NEW_AUX_ENT( 0, AT_HWCAP, hwcap);
569 NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE);
570 NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC);
571 NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr);
572 NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr));
573 NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum);
574 NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr);
575 NEW_AUX_ENT( 7, AT_FLAGS, 0);
576 NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr);
577 NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid);
578 NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid);
579 NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid);
580 NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid);
583 /* ARCH_DLINFO must come last so platform specific code can enforce
584 * special alignment requirements on the AUXV if necessary (eg. PPC).
590 /* allocate room for argv[] and envv[] */
591 csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
592 envp = (elf_caddr_t __user *) csp;
593 csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
594 argv = (elf_caddr_t __user *) csp;
597 csp -= sizeof(unsigned long);
598 __put_user(bprm->argc, (unsigned long __user *) csp);
602 /* fill in the argv[] array */
604 current->mm->arg_start = bprm->p;
606 current->mm->arg_start = current->mm->start_stack -
607 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
610 p = (char __user *) current->mm->arg_start;
611 for (loop = bprm->argc; loop > 0; loop--) {
612 __put_user((elf_caddr_t) p, argv++);
613 len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES);
614 if (!len || len > PAGE_SIZE * MAX_ARG_PAGES)
618 __put_user(NULL, argv);
619 current->mm->arg_end = (unsigned long) p;
621 /* fill in the envv[] array */
622 current->mm->env_start = (unsigned long) p;
623 for (loop = bprm->envc; loop > 0; loop--) {
624 __put_user((elf_caddr_t)(unsigned long) p, envp++);
625 len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES);
626 if (!len || len > PAGE_SIZE * MAX_ARG_PAGES)
630 __put_user(NULL, envp);
631 current->mm->env_end = (unsigned long) p;
633 mm->start_stack = (unsigned long) sp;
637 /*****************************************************************************/
639 * transfer the program arguments and environment from the holding pages onto
643 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
646 unsigned long index, stop, sp;
650 stop = bprm->p >> PAGE_SHIFT;
653 for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
654 src = kmap(bprm->page[index]);
656 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
658 kunmap(bprm->page[index]);
663 *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
670 /*****************************************************************************/
672 * load the appropriate binary image (executable or interpreter) into memory
673 * - we assume no MMU is available
674 * - if no other PIC bits are set in params->hdr->e_flags
675 * - we assume that the LOADable segments in the binary are independently relocatable
676 * - we assume R/O executable segments are shareable
678 * - we assume the loadable parts of the image to require fixed displacement
679 * - the image is not shareable
681 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
683 struct mm_struct *mm,
686 struct elf32_fdpic_loadmap *loadmap;
688 struct elf32_fdpic_loadseg *mseg;
690 struct elf32_fdpic_loadseg *seg;
691 struct elf32_phdr *phdr;
692 unsigned long load_addr, stop;
693 unsigned nloads, tmp;
697 /* allocate a load map table */
699 for (loop = 0; loop < params->hdr.e_phnum; loop++)
700 if (params->phdrs[loop].p_type == PT_LOAD)
706 size = sizeof(*loadmap) + nloads * sizeof(*seg);
707 loadmap = kmalloc(size, GFP_KERNEL);
711 params->loadmap = loadmap;
712 memset(loadmap, 0, size);
714 loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
715 loadmap->nsegs = nloads;
717 load_addr = params->load_addr;
720 /* map the requested LOADs into the memory space */
721 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
722 case ELF_FDPIC_FLAG_CONSTDISP:
723 case ELF_FDPIC_FLAG_CONTIGUOUS:
725 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
731 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
737 /* map the entry point */
738 if (params->hdr.e_entry) {
740 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
741 if (params->hdr.e_entry >= seg->p_vaddr &&
742 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
744 (params->hdr.e_entry - seg->p_vaddr) +
751 /* determine where the program header table has wound up if mapped */
752 stop = params->hdr.e_phoff;
753 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
754 phdr = params->phdrs;
756 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
757 if (phdr->p_type != PT_LOAD)
760 if (phdr->p_offset > params->hdr.e_phoff ||
761 phdr->p_offset + phdr->p_filesz < stop)
765 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
766 if (phdr->p_vaddr >= seg->p_vaddr &&
767 phdr->p_vaddr + phdr->p_filesz <=
768 seg->p_vaddr + seg->p_memsz) {
770 (phdr->p_vaddr - seg->p_vaddr) +
772 params->hdr.e_phoff - phdr->p_offset;
779 /* determine where the dynamic section has wound up if there is one */
780 phdr = params->phdrs;
781 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
782 if (phdr->p_type != PT_DYNAMIC)
786 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
787 if (phdr->p_vaddr >= seg->p_vaddr &&
788 phdr->p_vaddr + phdr->p_memsz <=
789 seg->p_vaddr + seg->p_memsz) {
790 params->dynamic_addr =
791 (phdr->p_vaddr - seg->p_vaddr) +
794 /* check the dynamic section contains at least
795 * one item, and that the last item is a NULL
797 if (phdr->p_memsz == 0 ||
798 phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
801 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
803 params->dynamic_addr)[tmp - 1].d_tag != 0)
811 /* now elide adjacent segments in the load map on MMU linux
812 * - on uClinux the holes between may actually be filled with system
813 * stuff or stuff from other processes
816 nloads = loadmap->nsegs;
817 mseg = loadmap->segs;
819 for (loop = 1; loop < nloads; loop++) {
820 /* see if we have a candidate for merging */
821 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
822 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
823 if (load_addr == (seg->addr & PAGE_MASK)) {
826 (mseg->addr + mseg->p_memsz);
827 mseg->p_memsz += seg->addr & ~PAGE_MASK;
828 mseg->p_memsz += seg->p_memsz;
840 kdebug("Mapped Object [%s]:", what);
841 kdebug("- elfhdr : %lx", params->elfhdr_addr);
842 kdebug("- entry : %lx", params->entry_addr);
843 kdebug("- PHDR[] : %lx", params->ph_addr);
844 kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
846 for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
847 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
849 seg->addr, seg->addr + seg->p_memsz - 1,
850 seg->p_vaddr, seg->p_memsz);
855 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
856 what, file->f_dentry->d_inode->i_ino);
860 /*****************************************************************************/
862 * map a file with constant displacement under uClinux
865 static int elf_fdpic_map_file_constdisp_on_uclinux(
866 struct elf_fdpic_params *params,
868 struct mm_struct *mm)
870 struct elf32_fdpic_loadseg *seg;
871 struct elf32_phdr *phdr;
872 unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
876 load_addr = params->load_addr;
877 seg = params->loadmap->segs;
879 /* determine the bounds of the contiguous overall allocation we must
881 phdr = params->phdrs;
882 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
883 if (params->phdrs[loop].p_type != PT_LOAD)
886 if (base > phdr->p_vaddr)
887 base = phdr->p_vaddr;
888 if (top < phdr->p_vaddr + phdr->p_memsz)
889 top = phdr->p_vaddr + phdr->p_memsz;
892 /* allocate one big anon block for everything */
893 mflags = MAP_PRIVATE;
894 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
895 mflags |= MAP_EXECUTABLE;
897 down_write(&mm->mmap_sem);
898 maddr = do_mmap(NULL, load_addr, top - base,
899 PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
900 up_write(&mm->mmap_sem);
901 if (IS_ERR_VALUE(maddr))
905 load_addr += PAGE_ALIGN(top - base);
907 /* and then load the file segments into it */
908 phdr = params->phdrs;
909 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
910 if (params->phdrs[loop].p_type != PT_LOAD)
913 fpos = phdr->p_offset;
915 seg->addr = maddr + (phdr->p_vaddr - base);
916 seg->p_vaddr = phdr->p_vaddr;
917 seg->p_memsz = phdr->p_memsz;
919 ret = file->f_op->read(file, (void *) seg->addr,
920 phdr->p_filesz, &fpos);
924 /* map the ELF header address if in this segment */
925 if (phdr->p_offset == 0)
926 params->elfhdr_addr = seg->addr;
928 /* clear any space allocated but not loaded */
929 if (phdr->p_filesz < phdr->p_memsz)
930 clear_user((void *) (seg->addr + phdr->p_filesz),
931 phdr->p_memsz - phdr->p_filesz);
934 if (phdr->p_flags & PF_X) {
935 mm->start_code = seg->addr;
936 mm->end_code = seg->addr + phdr->p_memsz;
937 } else if (!mm->start_data) {
938 mm->start_data = seg->addr;
940 mm->end_data = seg->addr + phdr->p_memsz;
945 if (seg->addr + phdr->p_memsz > mm->end_data)
946 mm->end_data = seg->addr + phdr->p_memsz;
957 /*****************************************************************************/
959 * map a binary by direct mmap() of the individual PT_LOAD segments
961 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
963 struct mm_struct *mm)
965 struct elf32_fdpic_loadseg *seg;
966 struct elf32_phdr *phdr;
967 unsigned long load_addr, delta_vaddr;
970 load_addr = params->load_addr;
974 seg = params->loadmap->segs;
976 /* deal with each load segment separately */
977 phdr = params->phdrs;
978 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
979 unsigned long maddr, disp, excess, excess1;
982 if (phdr->p_type != PT_LOAD)
985 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
986 (unsigned long) phdr->p_vaddr,
987 (unsigned long) phdr->p_offset,
988 (unsigned long) phdr->p_filesz,
989 (unsigned long) phdr->p_memsz);
991 /* determine the mapping parameters */
992 if (phdr->p_flags & PF_R) prot |= PROT_READ;
993 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
994 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
996 flags = MAP_PRIVATE | MAP_DENYWRITE;
997 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
998 flags |= MAP_EXECUTABLE;
1002 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1003 case ELF_FDPIC_FLAG_INDEPENDENT:
1004 /* PT_LOADs are independently locatable */
1007 case ELF_FDPIC_FLAG_HONOURVADDR:
1008 /* the specified virtual address must be honoured */
1009 maddr = phdr->p_vaddr;
1013 case ELF_FDPIC_FLAG_CONSTDISP:
1014 /* constant displacement
1015 * - can be mapped anywhere, but must be mapped as a
1020 delta_vaddr = phdr->p_vaddr;
1023 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1028 case ELF_FDPIC_FLAG_CONTIGUOUS:
1029 /* contiguity handled later */
1038 /* create the mapping */
1039 disp = phdr->p_vaddr & ~PAGE_MASK;
1040 down_write(&mm->mmap_sem);
1041 maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1042 phdr->p_offset - disp);
1043 up_write(&mm->mmap_sem);
1045 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1046 loop, phdr->p_memsz + disp, prot, flags,
1047 phdr->p_offset - disp, maddr);
1049 if (IS_ERR_VALUE(maddr))
1052 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1053 ELF_FDPIC_FLAG_CONTIGUOUS)
1054 load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1056 seg->addr = maddr + disp;
1057 seg->p_vaddr = phdr->p_vaddr;
1058 seg->p_memsz = phdr->p_memsz;
1060 /* map the ELF header address if in this segment */
1061 if (phdr->p_offset == 0)
1062 params->elfhdr_addr = seg->addr;
1064 /* clear the bit between beginning of mapping and beginning of
1066 if (prot & PROT_WRITE && disp > 0) {
1067 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1068 clear_user((void __user *) maddr, disp);
1072 /* clear any space allocated but not loaded
1073 * - on uClinux we can just clear the lot
1074 * - on MMU linux we'll get a SIGBUS beyond the last page
1075 * extant in the file
1077 excess = phdr->p_memsz - phdr->p_filesz;
1078 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1081 if (excess > excess1) {
1082 unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1083 unsigned long xmaddr;
1085 flags |= MAP_FIXED | MAP_ANONYMOUS;
1086 down_write(&mm->mmap_sem);
1087 xmaddr = do_mmap(NULL, xaddr, excess - excess1,
1089 up_write(&mm->mmap_sem);
1091 kdebug("mmap[%d] <anon>"
1092 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1093 loop, xaddr, excess - excess1, prot, flags,
1096 if (xmaddr != xaddr)
1100 if (prot & PROT_WRITE && excess1 > 0) {
1101 kdebug("clear[%d] ad=%lx sz=%lx",
1102 loop, maddr + phdr->p_filesz, excess1);
1103 clear_user((void __user *) maddr + phdr->p_filesz,
1109 kdebug("clear[%d] ad=%lx sz=%lx",
1110 loop, maddr + phdr->p_filesz, excess);
1111 clear_user((void *) maddr + phdr->p_filesz, excess);
1116 if (phdr->p_flags & PF_X) {
1117 mm->start_code = maddr;
1118 mm->end_code = maddr + phdr->p_memsz;
1119 } else if (!mm->start_data) {
1120 mm->start_data = maddr;
1121 mm->end_data = maddr + phdr->p_memsz;
1131 /*****************************************************************************/
1133 * ELF-FDPIC core dumper
1135 * Modelled on fs/exec.c:aout_core_dump()
1136 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1138 * Modelled on fs/binfmt_elf.c core dumper
1140 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1143 * These are the only things you should do on a core-file: use only these
1144 * functions to write out all the necessary info.
1146 static int dump_write(struct file *file, const void *addr, int nr)
1148 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1151 static int dump_seek(struct file *file, loff_t off)
1153 if (file->f_op->llseek) {
1154 if (file->f_op->llseek(file, off, SEEK_SET) != off)
1163 * Decide whether a segment is worth dumping; default is yes to be
1164 * sure (missing info is worse than too much; etc).
1165 * Personally I'd include everything, and use the coredump limit...
1167 * I think we should skip something. But I am not sure how. H.J.
1169 static int maydump(struct vm_area_struct *vma)
1171 /* Do not dump I/O mapped devices or special mappings */
1172 if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
1173 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1177 /* If we may not read the contents, don't allow us to dump
1178 * them either. "dump_write()" can't handle it anyway.
1180 if (!(vma->vm_flags & VM_READ)) {
1181 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1185 /* Dump shared memory only if mapped from an anonymous file. */
1186 if (vma->vm_flags & VM_SHARED) {
1187 if (vma->vm_file->f_dentry->d_inode->i_nlink == 0) {
1188 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1192 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1197 /* If it hasn't been written to, don't write it out */
1198 if (!vma->anon_vma) {
1199 kdcore("%08lx: %08lx: no (!anon)", vma->vm_start, vma->vm_flags);
1204 kdcore("%08lx: %08lx: yes", vma->vm_start, vma->vm_flags);
1208 /* An ELF note in memory */
1213 unsigned int datasz;
1217 static int notesize(struct memelfnote *en)
1221 sz = sizeof(struct elf_note);
1222 sz += roundup(strlen(en->name) + 1, 4);
1223 sz += roundup(en->datasz, 4);
1230 #define DUMP_WRITE(addr, nr) \
1231 do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1232 #define DUMP_SEEK(off) \
1233 do { if (!dump_seek(file, (off))) return 0; } while(0)
1235 static int writenote(struct memelfnote *men, struct file *file)
1239 en.n_namesz = strlen(men->name) + 1;
1240 en.n_descsz = men->datasz;
1241 en.n_type = men->type;
1243 DUMP_WRITE(&en, sizeof(en));
1244 DUMP_WRITE(men->name, en.n_namesz);
1245 /* XXX - cast from long long to long to avoid need for libgcc.a */
1246 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1247 DUMP_WRITE(men->data, men->datasz);
1248 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1255 #define DUMP_WRITE(addr, nr) \
1256 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1258 #define DUMP_SEEK(off) \
1259 if (!dump_seek(file, (off))) \
1262 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1264 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1265 elf->e_ident[EI_CLASS] = ELF_CLASS;
1266 elf->e_ident[EI_DATA] = ELF_DATA;
1267 elf->e_ident[EI_VERSION] = EV_CURRENT;
1268 elf->e_ident[EI_OSABI] = ELF_OSABI;
1269 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1271 elf->e_type = ET_CORE;
1272 elf->e_machine = ELF_ARCH;
1273 elf->e_version = EV_CURRENT;
1275 elf->e_phoff = sizeof(struct elfhdr);
1277 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1278 elf->e_ehsize = sizeof(struct elfhdr);
1279 elf->e_phentsize = sizeof(struct elf_phdr);
1280 elf->e_phnum = segs;
1281 elf->e_shentsize = 0;
1283 elf->e_shstrndx = 0;
1287 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1289 phdr->p_type = PT_NOTE;
1290 phdr->p_offset = offset;
1293 phdr->p_filesz = sz;
1300 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1301 unsigned int sz, void *data)
1311 * fill up all the fields in prstatus from the given task struct, except
1312 * registers which need to be filled up seperately.
1314 static void fill_prstatus(struct elf_prstatus *prstatus,
1315 struct task_struct *p, long signr)
1317 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1318 prstatus->pr_sigpend = p->pending.signal.sig[0];
1319 prstatus->pr_sighold = p->blocked.sig[0];
1320 prstatus->pr_pid = p->pid;
1321 prstatus->pr_ppid = p->parent->pid;
1322 prstatus->pr_pgrp = process_group(p);
1323 prstatus->pr_sid = p->signal->session;
1324 if (thread_group_leader(p)) {
1326 * This is the record for the group leader. Add in the
1327 * cumulative times of previous dead threads. This total
1328 * won't include the time of each live thread whose state
1329 * is included in the core dump. The final total reported
1330 * to our parent process when it calls wait4 will include
1331 * those sums as well as the little bit more time it takes
1332 * this and each other thread to finish dying after the
1333 * core dump synchronization phase.
1335 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1336 &prstatus->pr_utime);
1337 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1338 &prstatus->pr_stime);
1340 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1341 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1343 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1344 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1346 prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1347 prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1350 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1351 struct mm_struct *mm)
1353 unsigned int i, len;
1355 /* first copy the parameters from user space */
1356 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1358 len = mm->arg_end - mm->arg_start;
1359 if (len >= ELF_PRARGSZ)
1360 len = ELF_PRARGSZ - 1;
1361 if (copy_from_user(&psinfo->pr_psargs,
1362 (const char __user *) mm->arg_start, len))
1364 for (i = 0; i < len; i++)
1365 if (psinfo->pr_psargs[i] == 0)
1366 psinfo->pr_psargs[i] = ' ';
1367 psinfo->pr_psargs[len] = 0;
1369 psinfo->pr_pid = p->pid;
1370 psinfo->pr_ppid = p->parent->pid;
1371 psinfo->pr_pgrp = process_group(p);
1372 psinfo->pr_sid = p->signal->session;
1374 i = p->state ? ffz(~p->state) + 1 : 0;
1375 psinfo->pr_state = i;
1376 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1377 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1378 psinfo->pr_nice = task_nice(p);
1379 psinfo->pr_flag = p->flags;
1380 SET_UID(psinfo->pr_uid, p->uid);
1381 SET_GID(psinfo->pr_gid, p->gid);
1382 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1387 /* Here is the structure in which status of each thread is captured. */
1388 struct elf_thread_status
1390 struct list_head list;
1391 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1392 elf_fpregset_t fpu; /* NT_PRFPREG */
1393 struct task_struct *thread;
1394 #ifdef ELF_CORE_COPY_XFPREGS
1395 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1397 struct memelfnote notes[3];
1402 * In order to add the specific thread information for the elf file format,
1403 * we need to keep a linked list of every thread's pr_status and then create
1404 * a single section for them in the final core file.
1406 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1408 struct task_struct *p = t->thread;
1413 fill_prstatus(&t->prstatus, p, signr);
1414 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1416 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1419 sz += notesize(&t->notes[0]);
1421 t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1422 if (t->prstatus.pr_fpvalid) {
1423 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1426 sz += notesize(&t->notes[1]);
1429 #ifdef ELF_CORE_COPY_XFPREGS
1430 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1431 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1434 sz += notesize(&t->notes[2]);
1441 * dump the segments for an MMU process
1444 static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1445 size_t *size, unsigned long *limit)
1447 struct vm_area_struct *vma;
1449 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1455 for (addr = vma->vm_start;
1459 struct vm_area_struct *vma;
1462 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1463 &page, &vma) <= 0) {
1464 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1466 else if (page == ZERO_PAGE(addr)) {
1467 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1468 page_cache_release(page);
1473 flush_cache_page(vma, addr, page_to_pfn(page));
1475 if ((*size += PAGE_SIZE) > *limit ||
1476 !dump_write(file, kaddr, PAGE_SIZE)
1479 page_cache_release(page);
1483 page_cache_release(page);
1496 * dump the segments for a NOMMU process
1499 static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1500 size_t *size, unsigned long *limit)
1502 struct vm_list_struct *vml;
1504 for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
1505 struct vm_area_struct *vma = vml->vma;
1510 if ((*size += PAGE_SIZE) > *limit)
1513 if (!dump_write(file, (void *) vma->vm_start,
1514 vma->vm_end - vma->vm_start))
1525 * This is a two-pass process; first we find the offsets of the bits,
1526 * and then they are actually written out. If we run out of core limit
1529 static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
1538 struct vm_area_struct *vma;
1539 struct elfhdr *elf = NULL;
1540 loff_t offset = 0, dataoff;
1541 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1543 struct memelfnote *notes = NULL;
1544 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1545 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1546 struct task_struct *g, *p;
1547 LIST_HEAD(thread_list);
1548 struct list_head *t;
1549 elf_fpregset_t *fpu = NULL;
1550 #ifdef ELF_CORE_COPY_XFPREGS
1551 elf_fpxregset_t *xfpu = NULL;
1553 int thread_status_size = 0;
1555 struct vm_list_struct *vml;
1560 * We no longer stop all VM operations.
1562 * This is because those proceses that could possibly change map_count
1563 * or the mmap / vma pages are now blocked in do_exit on current
1564 * finishing this core dump.
1566 * Only ptrace can touch these memory addresses, but it doesn't change
1567 * the map_count or the pages allocated. So no possibility of crashing
1568 * exists while dumping the mm->vm_next areas to the core file.
1571 /* alloc memory for large data structures: too large to be on stack */
1572 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1575 prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1578 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1581 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1584 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1587 #ifdef ELF_CORE_COPY_XFPREGS
1588 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1594 struct elf_thread_status *tmp;
1595 read_lock(&tasklist_lock);
1597 if (current->mm == p->mm && current != p) {
1598 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1600 read_unlock(&tasklist_lock);
1603 INIT_LIST_HEAD(&tmp->list);
1605 list_add(&tmp->list, &thread_list);
1607 while_each_thread(g,p);
1608 read_unlock(&tasklist_lock);
1609 list_for_each(t, &thread_list) {
1610 struct elf_thread_status *tmp;
1613 tmp = list_entry(t, struct elf_thread_status, list);
1614 sz = elf_dump_thread_status(signr, tmp);
1615 thread_status_size += sz;
1619 /* now collect the dump for the current */
1620 fill_prstatus(prstatus, current, signr);
1621 elf_core_copy_regs(&prstatus->pr_reg, regs);
1624 segs = current->mm->map_count;
1627 for (vml = current->mm->context.vmlist; vml; vml = vml->next)
1630 #ifdef ELF_CORE_EXTRA_PHDRS
1631 segs += ELF_CORE_EXTRA_PHDRS;
1635 fill_elf_fdpic_header(elf, segs + 1); /* including notes section */
1638 current->flags |= PF_DUMPCORE;
1641 * Set up the notes in similar form to SVR4 core dumps made
1642 * with info from their /proc.
1645 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1646 fill_psinfo(psinfo, current->group_leader, current->mm);
1647 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1651 auxv = (elf_addr_t *) current->mm->saved_auxv;
1656 while (auxv[i - 2] != AT_NULL);
1657 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1658 i * sizeof(elf_addr_t), auxv);
1660 /* Try to dump the FPU. */
1661 if ((prstatus->pr_fpvalid =
1662 elf_core_copy_task_fpregs(current, regs, fpu)))
1663 fill_note(notes + numnote++,
1664 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1665 #ifdef ELF_CORE_COPY_XFPREGS
1666 if (elf_core_copy_task_xfpregs(current, xfpu))
1667 fill_note(notes + numnote++,
1668 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1674 DUMP_WRITE(elf, sizeof(*elf));
1675 offset += sizeof(*elf); /* Elf header */
1676 offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
1678 /* Write notes phdr entry */
1680 struct elf_phdr phdr;
1683 for (i = 0; i < numnote; i++)
1684 sz += notesize(notes + i);
1686 sz += thread_status_size;
1688 fill_elf_note_phdr(&phdr, sz, offset);
1690 DUMP_WRITE(&phdr, sizeof(phdr));
1693 /* Page-align dumped data */
1694 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1696 /* write program headers for segments dump */
1699 vma = current->mm->mmap; vma; vma = vma->vm_next
1701 vml = current->mm->context.vmlist; vml; vml = vml->next
1704 struct elf_phdr phdr;
1711 sz = vma->vm_end - vma->vm_start;
1713 phdr.p_type = PT_LOAD;
1714 phdr.p_offset = offset;
1715 phdr.p_vaddr = vma->vm_start;
1717 phdr.p_filesz = maydump(vma) ? sz : 0;
1719 offset += phdr.p_filesz;
1720 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1721 if (vma->vm_flags & VM_WRITE)
1722 phdr.p_flags |= PF_W;
1723 if (vma->vm_flags & VM_EXEC)
1724 phdr.p_flags |= PF_X;
1725 phdr.p_align = ELF_EXEC_PAGESIZE;
1727 DUMP_WRITE(&phdr, sizeof(phdr));
1730 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1731 ELF_CORE_WRITE_EXTRA_PHDRS;
1734 /* write out the notes section */
1735 for (i = 0; i < numnote; i++)
1736 if (!writenote(notes + i, file))
1739 /* write out the thread status notes section */
1740 list_for_each(t, &thread_list) {
1741 struct elf_thread_status *tmp =
1742 list_entry(t, struct elf_thread_status, list);
1744 for (i = 0; i < tmp->num_notes; i++)
1745 if (!writenote(&tmp->notes[i], file))
1751 if (elf_fdpic_dump_segments(file, current->mm, &size, &limit) < 0)
1754 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1755 ELF_CORE_WRITE_EXTRA_DATA;
1758 if (file->f_pos != offset) {
1761 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1762 file->f_pos, offset);
1769 while (!list_empty(&thread_list)) {
1770 struct list_head *tmp = thread_list.next;
1772 kfree(list_entry(tmp, struct elf_thread_status, list));
1780 #ifdef ELF_CORE_COPY_XFPREGS
1787 #endif /* USE_ELF_CORE_DUMP */