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_cvirt.h>
39 #include <asm/uaccess.h>
40 #include <asm/param.h>
41 #include <asm/pgalloc.h>
43 typedef char *elf_caddr_t;
45 #define elf_addr_t unsigned long
49 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
51 #define kdebug(fmt, ...) do {} while(0)
55 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
57 #define kdcore(fmt, ...) do {} while(0)
60 MODULE_LICENSE("GPL");
62 static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
63 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
64 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
65 struct mm_struct *, const char *);
67 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
68 struct elf_fdpic_params *,
69 struct elf_fdpic_params *);
72 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
74 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
79 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
80 struct file *, struct mm_struct *);
82 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
83 static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *);
86 static struct linux_binfmt elf_fdpic_format = {
87 .module = THIS_MODULE,
88 .load_binary = load_elf_fdpic_binary,
89 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
90 .core_dump = elf_fdpic_core_dump,
92 .min_coredump = ELF_EXEC_PAGESIZE,
95 static int __init init_elf_fdpic_binfmt(void)
97 return register_binfmt(&elf_fdpic_format);
100 static void __exit exit_elf_fdpic_binfmt(void)
102 unregister_binfmt(&elf_fdpic_format);
105 core_initcall(init_elf_fdpic_binfmt);
106 module_exit(exit_elf_fdpic_binfmt);
108 static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
110 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
112 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
114 if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr))
116 if (!file->f_op || !file->f_op->mmap)
121 /*****************************************************************************/
123 * read the program headers table into memory
125 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
128 struct elf32_phdr *phdr;
132 if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
134 if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
137 size = params->hdr.e_phnum * sizeof(struct elf_phdr);
138 params->phdrs = kmalloc(size, GFP_KERNEL);
142 retval = kernel_read(file, params->hdr.e_phoff,
143 (char *) params->phdrs, size);
147 /* determine stack size for this binary */
148 phdr = params->phdrs;
149 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
150 if (phdr->p_type != PT_GNU_STACK)
153 if (phdr->p_flags & PF_X)
154 params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
156 params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
158 params->stack_size = phdr->p_memsz;
165 /*****************************************************************************/
167 * load an fdpic binary into various bits of memory
169 static int load_elf_fdpic_binary(struct linux_binprm *bprm,
170 struct pt_regs *regs)
172 struct elf_fdpic_params exec_params, interp_params;
173 struct elf_phdr *phdr;
174 unsigned long stack_size, entryaddr;
176 unsigned long fullsize;
178 #ifdef ELF_FDPIC_PLAT_INIT
179 unsigned long dynaddr;
181 struct file *interpreter = NULL; /* to shut gcc up */
182 char *interpreter_name = NULL;
183 int executable_stack;
186 memset(&exec_params, 0, sizeof(exec_params));
187 memset(&interp_params, 0, sizeof(interp_params));
189 exec_params.hdr = *(struct elfhdr *) bprm->buf;
190 exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
192 /* check that this is a binary we know how to deal with */
194 if (!is_elf_fdpic(&exec_params.hdr, bprm->file))
197 /* read the program header table */
198 retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
202 /* scan for a program header that specifies an interpreter */
203 phdr = exec_params.phdrs;
205 for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
206 switch (phdr->p_type) {
209 if (phdr->p_filesz > PATH_MAX)
212 if (phdr->p_filesz < 2)
215 /* read the name of the interpreter into memory */
216 interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
217 if (!interpreter_name)
220 retval = kernel_read(bprm->file,
228 if (interpreter_name[phdr->p_filesz - 1] != '\0')
231 kdebug("Using ELF interpreter %s", interpreter_name);
233 /* replace the program with the interpreter */
234 interpreter = open_exec(interpreter_name);
235 retval = PTR_ERR(interpreter);
236 if (IS_ERR(interpreter)) {
241 retval = kernel_read(interpreter, 0, bprm->buf,
246 interp_params.hdr = *((struct elfhdr *) bprm->buf);
251 if (exec_params.load_addr == 0)
252 exec_params.load_addr = phdr->p_vaddr;
259 if (elf_check_const_displacement(&exec_params.hdr))
260 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
262 /* perform insanity checks on the interpreter */
263 if (interpreter_name) {
265 if (!is_elf_fdpic(&interp_params.hdr, interpreter))
268 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
270 /* read the interpreter's program header table */
271 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
276 stack_size = exec_params.stack_size;
277 if (stack_size < interp_params.stack_size)
278 stack_size = interp_params.stack_size;
280 if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
281 executable_stack = EXSTACK_ENABLE_X;
282 else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
283 executable_stack = EXSTACK_DISABLE_X;
284 else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
285 executable_stack = EXSTACK_ENABLE_X;
286 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
287 executable_stack = EXSTACK_DISABLE_X;
289 executable_stack = EXSTACK_DEFAULT;
295 if (elf_check_const_displacement(&interp_params.hdr))
296 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
298 /* flush all traces of the currently running executable */
299 retval = flush_old_exec(bprm);
303 /* there's now no turning back... the old userspace image is dead,
304 * defunct, deceased, etc. after this point we have to exit via
306 set_personality(PER_LINUX_FDPIC);
307 set_binfmt(&elf_fdpic_format);
309 current->mm->start_code = 0;
310 current->mm->end_code = 0;
311 current->mm->start_stack = 0;
312 current->mm->start_data = 0;
313 current->mm->end_data = 0;
314 current->mm->context.exec_fdpic_loadmap = 0;
315 current->mm->context.interp_fdpic_loadmap = 0;
317 current->flags &= ~PF_FORKNOEXEC;
320 elf_fdpic_arch_lay_out_mm(&exec_params,
322 ¤t->mm->start_stack,
323 ¤t->mm->start_brk);
325 retval = setup_arg_pages(bprm, current->mm->start_stack,
328 send_sig(SIGKILL, current, 0);
333 /* load the executable and interpreter into memory */
334 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
339 if (interpreter_name) {
340 retval = elf_fdpic_map_file(&interp_params, interpreter,
341 current->mm, "interpreter");
343 printk(KERN_ERR "Unable to load interpreter\n");
347 allow_write_access(interpreter);
353 if (!current->mm->start_brk)
354 current->mm->start_brk = current->mm->end_data;
356 current->mm->brk = current->mm->start_brk =
357 PAGE_ALIGN(current->mm->start_brk);
360 /* create a stack and brk area big enough for everyone
361 * - the brk heap starts at the bottom and works up
362 * - the stack starts at the top and works down
364 stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
365 if (stack_size < PAGE_SIZE * 2)
366 stack_size = PAGE_SIZE * 2;
368 down_write(¤t->mm->mmap_sem);
369 current->mm->start_brk = do_mmap(NULL, 0, stack_size,
370 PROT_READ | PROT_WRITE | PROT_EXEC,
371 MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN,
374 if (IS_ERR_VALUE(current->mm->start_brk)) {
375 up_write(¤t->mm->mmap_sem);
376 retval = current->mm->start_brk;
377 current->mm->start_brk = 0;
381 /* expand the stack mapping to use up the entire allocation granule */
382 fullsize = ksize((char *) current->mm->start_brk);
383 if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
385 stack_size = fullsize;
386 up_write(¤t->mm->mmap_sem);
388 current->mm->brk = current->mm->start_brk;
389 current->mm->context.end_brk = current->mm->start_brk;
390 current->mm->context.end_brk +=
391 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
392 current->mm->start_stack = current->mm->start_brk + stack_size;
396 current->flags &= ~PF_FORKNOEXEC;
397 if (create_elf_fdpic_tables(bprm, current->mm,
398 &exec_params, &interp_params) < 0)
401 kdebug("- start_code %lx", current->mm->start_code);
402 kdebug("- end_code %lx", current->mm->end_code);
403 kdebug("- start_data %lx", current->mm->start_data);
404 kdebug("- end_data %lx", current->mm->end_data);
405 kdebug("- start_brk %lx", current->mm->start_brk);
406 kdebug("- brk %lx", current->mm->brk);
407 kdebug("- start_stack %lx", current->mm->start_stack);
409 #ifdef ELF_FDPIC_PLAT_INIT
411 * The ABI may specify that certain registers be set up in special
412 * ways (on i386 %edx is the address of a DT_FINI function, for
413 * example. This macro performs whatever initialization to
414 * the regs structure is required.
416 dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
417 ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
421 /* everything is now ready... get the userspace context ready to roll */
422 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
423 start_thread(regs, entryaddr, current->mm->start_stack);
425 if (unlikely(current->ptrace & PT_PTRACED)) {
426 if (current->ptrace & PT_TRACE_EXEC)
427 ptrace_notify((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
429 send_sig(SIGTRAP, current, 0);
436 allow_write_access(interpreter);
439 kfree(interpreter_name);
440 kfree(exec_params.phdrs);
441 kfree(exec_params.loadmap);
442 kfree(interp_params.phdrs);
443 kfree(interp_params.loadmap);
446 /* unrecoverable error - kill the process */
448 send_sig(SIGSEGV, current, 0);
453 /*****************************************************************************/
455 * present useful information to the program
457 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
458 struct mm_struct *mm,
459 struct elf_fdpic_params *exec_params,
460 struct elf_fdpic_params *interp_params)
462 unsigned long sp, csp, nitems;
463 elf_caddr_t __user *argv, *envp;
464 size_t platform_len = 0, len;
466 char __user *u_platform, *p;
470 /* we're going to shovel a whole load of stuff onto the stack */
474 sp = mm->start_stack;
476 /* stack the program arguments and environment */
477 if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
481 /* get hold of platform and hardware capabilities masks for the machine
482 * we are running on. In some cases (Sparc), this info is impossible
483 * to get, in others (i386) it is merely difficult.
486 k_platform = ELF_PLATFORM;
490 platform_len = strlen(k_platform) + 1;
492 u_platform = (char __user *) sp;
493 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
497 #if defined(__i386__) && defined(CONFIG_SMP)
498 /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
499 * by the processes running on the same package. One thing we can do is
500 * to shuffle the initial stack for them.
502 * the conditionals here are unneeded, but kept in to make the code
503 * behaviour the same as pre change unless we have hyperthreaded
504 * processors. This keeps Mr Marcelo Person happier but should be
507 if (smp_num_siblings > 1)
508 sp = sp - ((current->pid % 64) << 7);
513 /* stack the load map(s) */
514 len = sizeof(struct elf32_fdpic_loadmap);
515 len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
516 sp = (sp - len) & ~7UL;
517 exec_params->map_addr = sp;
519 if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
522 current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
524 if (interp_params->loadmap) {
525 len = sizeof(struct elf32_fdpic_loadmap);
526 len += sizeof(struct elf32_fdpic_loadseg) *
527 interp_params->loadmap->nsegs;
528 sp = (sp - len) & ~7UL;
529 interp_params->map_addr = sp;
531 if (copy_to_user((void __user *) sp, interp_params->loadmap,
535 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
538 /* force 16 byte _final_ alignment here for generality */
539 #define DLINFO_ITEMS 13
541 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0);
542 #ifdef DLINFO_ARCH_ITEMS
543 nitems += DLINFO_ARCH_ITEMS;
547 sp -= nitems * 2 * sizeof(unsigned long);
548 sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */
549 sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */
550 sp -= 1 * sizeof(unsigned long); /* argc */
555 /* put the ELF interpreter info on the stack */
556 #define NEW_AUX_ENT(nr, id, val) \
558 struct { unsigned long _id, _val; } __user *ent; \
560 ent = (void __user *) csp; \
561 __put_user((id), &ent[nr]._id); \
562 __put_user((val), &ent[nr]._val); \
565 csp -= 2 * sizeof(unsigned long);
566 NEW_AUX_ENT(0, AT_NULL, 0);
568 csp -= 2 * sizeof(unsigned long);
569 NEW_AUX_ENT(0, AT_PLATFORM,
570 (elf_addr_t) (unsigned long) u_platform);
573 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
574 NEW_AUX_ENT( 0, AT_HWCAP, hwcap);
575 NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE);
576 NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC);
577 NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr);
578 NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr));
579 NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum);
580 NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr);
581 NEW_AUX_ENT( 7, AT_FLAGS, 0);
582 NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr);
583 NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid);
584 NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid);
585 NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid);
586 NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid);
589 /* ARCH_DLINFO must come last so platform specific code can enforce
590 * special alignment requirements on the AUXV if necessary (eg. PPC).
596 /* allocate room for argv[] and envv[] */
597 csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
598 envp = (elf_caddr_t __user *) csp;
599 csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
600 argv = (elf_caddr_t __user *) csp;
603 csp -= sizeof(unsigned long);
604 __put_user(bprm->argc, (unsigned long __user *) csp);
608 /* fill in the argv[] array */
610 current->mm->arg_start = bprm->p;
612 current->mm->arg_start = current->mm->start_stack -
613 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
616 p = (char __user *) current->mm->arg_start;
617 for (loop = bprm->argc; loop > 0; loop--) {
618 __put_user((elf_caddr_t) p, argv++);
619 len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES);
620 if (!len || len > PAGE_SIZE * MAX_ARG_PAGES)
624 __put_user(NULL, argv);
625 current->mm->arg_end = (unsigned long) p;
627 /* fill in the envv[] array */
628 current->mm->env_start = (unsigned long) p;
629 for (loop = bprm->envc; loop > 0; loop--) {
630 __put_user((elf_caddr_t)(unsigned long) p, envp++);
631 len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES);
632 if (!len || len > PAGE_SIZE * MAX_ARG_PAGES)
636 __put_user(NULL, envp);
637 current->mm->env_end = (unsigned long) p;
639 mm->start_stack = (unsigned long) sp;
643 /*****************************************************************************/
645 * transfer the program arguments and environment from the holding pages onto
649 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
652 unsigned long index, stop, sp;
656 stop = bprm->p >> PAGE_SHIFT;
659 for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
660 src = kmap(bprm->page[index]);
662 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
664 kunmap(bprm->page[index]);
669 *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
676 /*****************************************************************************/
678 * load the appropriate binary image (executable or interpreter) into memory
679 * - we assume no MMU is available
680 * - if no other PIC bits are set in params->hdr->e_flags
681 * - we assume that the LOADable segments in the binary are independently relocatable
682 * - we assume R/O executable segments are shareable
684 * - we assume the loadable parts of the image to require fixed displacement
685 * - the image is not shareable
687 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
689 struct mm_struct *mm,
692 struct elf32_fdpic_loadmap *loadmap;
694 struct elf32_fdpic_loadseg *mseg;
696 struct elf32_fdpic_loadseg *seg;
697 struct elf32_phdr *phdr;
698 unsigned long load_addr, stop;
699 unsigned nloads, tmp;
703 /* allocate a load map table */
705 for (loop = 0; loop < params->hdr.e_phnum; loop++)
706 if (params->phdrs[loop].p_type == PT_LOAD)
712 size = sizeof(*loadmap) + nloads * sizeof(*seg);
713 loadmap = kmalloc(size, GFP_KERNEL);
717 params->loadmap = loadmap;
718 memset(loadmap, 0, size);
720 loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
721 loadmap->nsegs = nloads;
723 load_addr = params->load_addr;
726 /* map the requested LOADs into the memory space */
727 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
728 case ELF_FDPIC_FLAG_CONSTDISP:
729 case ELF_FDPIC_FLAG_CONTIGUOUS:
731 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
737 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
743 /* map the entry point */
744 if (params->hdr.e_entry) {
746 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
747 if (params->hdr.e_entry >= seg->p_vaddr &&
748 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
750 (params->hdr.e_entry - seg->p_vaddr) +
757 /* determine where the program header table has wound up if mapped */
758 stop = params->hdr.e_phoff;
759 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
760 phdr = params->phdrs;
762 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
763 if (phdr->p_type != PT_LOAD)
766 if (phdr->p_offset > params->hdr.e_phoff ||
767 phdr->p_offset + phdr->p_filesz < stop)
771 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
772 if (phdr->p_vaddr >= seg->p_vaddr &&
773 phdr->p_vaddr + phdr->p_filesz <=
774 seg->p_vaddr + seg->p_memsz) {
776 (phdr->p_vaddr - seg->p_vaddr) +
778 params->hdr.e_phoff - phdr->p_offset;
785 /* determine where the dynamic section has wound up if there is one */
786 phdr = params->phdrs;
787 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
788 if (phdr->p_type != PT_DYNAMIC)
792 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
793 if (phdr->p_vaddr >= seg->p_vaddr &&
794 phdr->p_vaddr + phdr->p_memsz <=
795 seg->p_vaddr + seg->p_memsz) {
796 params->dynamic_addr =
797 (phdr->p_vaddr - seg->p_vaddr) +
800 /* check the dynamic section contains at least
801 * one item, and that the last item is a NULL
803 if (phdr->p_memsz == 0 ||
804 phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
807 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
809 params->dynamic_addr)[tmp - 1].d_tag != 0)
817 /* now elide adjacent segments in the load map on MMU linux
818 * - on uClinux the holes between may actually be filled with system
819 * stuff or stuff from other processes
822 nloads = loadmap->nsegs;
823 mseg = loadmap->segs;
825 for (loop = 1; loop < nloads; loop++) {
826 /* see if we have a candidate for merging */
827 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
828 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
829 if (load_addr == (seg->addr & PAGE_MASK)) {
832 (mseg->addr + mseg->p_memsz);
833 mseg->p_memsz += seg->addr & ~PAGE_MASK;
834 mseg->p_memsz += seg->p_memsz;
846 kdebug("Mapped Object [%s]:", what);
847 kdebug("- elfhdr : %lx", params->elfhdr_addr);
848 kdebug("- entry : %lx", params->entry_addr);
849 kdebug("- PHDR[] : %lx", params->ph_addr);
850 kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
852 for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
853 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
855 seg->addr, seg->addr + seg->p_memsz - 1,
856 seg->p_vaddr, seg->p_memsz);
861 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
862 what, file->f_dentry->d_inode->i_ino);
866 /*****************************************************************************/
868 * map a file with constant displacement under uClinux
871 static int elf_fdpic_map_file_constdisp_on_uclinux(
872 struct elf_fdpic_params *params,
874 struct mm_struct *mm)
876 struct elf32_fdpic_loadseg *seg;
877 struct elf32_phdr *phdr;
878 unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
882 load_addr = params->load_addr;
883 seg = params->loadmap->segs;
885 /* determine the bounds of the contiguous overall allocation we must
887 phdr = params->phdrs;
888 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
889 if (params->phdrs[loop].p_type != PT_LOAD)
892 if (base > phdr->p_vaddr)
893 base = phdr->p_vaddr;
894 if (top < phdr->p_vaddr + phdr->p_memsz)
895 top = phdr->p_vaddr + phdr->p_memsz;
898 /* allocate one big anon block for everything */
899 mflags = MAP_PRIVATE;
900 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
901 mflags |= MAP_EXECUTABLE;
903 down_write(&mm->mmap_sem);
904 maddr = do_mmap(NULL, load_addr, top - base,
905 PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
906 up_write(&mm->mmap_sem);
907 if (IS_ERR_VALUE(maddr))
911 load_addr += PAGE_ALIGN(top - base);
913 /* and then load the file segments into it */
914 phdr = params->phdrs;
915 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
916 if (params->phdrs[loop].p_type != PT_LOAD)
919 fpos = phdr->p_offset;
921 seg->addr = maddr + (phdr->p_vaddr - base);
922 seg->p_vaddr = phdr->p_vaddr;
923 seg->p_memsz = phdr->p_memsz;
925 ret = file->f_op->read(file, (void *) seg->addr,
926 phdr->p_filesz, &fpos);
930 /* map the ELF header address if in this segment */
931 if (phdr->p_offset == 0)
932 params->elfhdr_addr = seg->addr;
934 /* clear any space allocated but not loaded */
935 if (phdr->p_filesz < phdr->p_memsz)
936 clear_user((void *) (seg->addr + phdr->p_filesz),
937 phdr->p_memsz - phdr->p_filesz);
940 if (phdr->p_flags & PF_X) {
941 mm->start_code = seg->addr;
942 mm->end_code = seg->addr + phdr->p_memsz;
943 } else if (!mm->start_data) {
944 mm->start_data = seg->addr;
946 mm->end_data = seg->addr + phdr->p_memsz;
951 if (seg->addr + phdr->p_memsz > mm->end_data)
952 mm->end_data = seg->addr + phdr->p_memsz;
963 /*****************************************************************************/
965 * map a binary by direct mmap() of the individual PT_LOAD segments
967 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
969 struct mm_struct *mm)
971 struct elf32_fdpic_loadseg *seg;
972 struct elf32_phdr *phdr;
973 unsigned long load_addr, delta_vaddr;
976 load_addr = params->load_addr;
980 seg = params->loadmap->segs;
982 /* deal with each load segment separately */
983 phdr = params->phdrs;
984 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
985 unsigned long maddr, disp, excess, excess1;
988 if (phdr->p_type != PT_LOAD)
991 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
992 (unsigned long) phdr->p_vaddr,
993 (unsigned long) phdr->p_offset,
994 (unsigned long) phdr->p_filesz,
995 (unsigned long) phdr->p_memsz);
997 /* determine the mapping parameters */
998 if (phdr->p_flags & PF_R) prot |= PROT_READ;
999 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1000 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1002 flags = MAP_PRIVATE | MAP_DENYWRITE;
1003 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1004 flags |= MAP_EXECUTABLE;
1008 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1009 case ELF_FDPIC_FLAG_INDEPENDENT:
1010 /* PT_LOADs are independently locatable */
1013 case ELF_FDPIC_FLAG_HONOURVADDR:
1014 /* the specified virtual address must be honoured */
1015 maddr = phdr->p_vaddr;
1019 case ELF_FDPIC_FLAG_CONSTDISP:
1020 /* constant displacement
1021 * - can be mapped anywhere, but must be mapped as a
1026 delta_vaddr = phdr->p_vaddr;
1029 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1034 case ELF_FDPIC_FLAG_CONTIGUOUS:
1035 /* contiguity handled later */
1044 /* create the mapping */
1045 disp = phdr->p_vaddr & ~PAGE_MASK;
1046 down_write(&mm->mmap_sem);
1047 maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1048 phdr->p_offset - disp);
1049 up_write(&mm->mmap_sem);
1051 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1052 loop, phdr->p_memsz + disp, prot, flags,
1053 phdr->p_offset - disp, maddr);
1055 if (IS_ERR_VALUE(maddr))
1058 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1059 ELF_FDPIC_FLAG_CONTIGUOUS)
1060 load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1062 seg->addr = maddr + disp;
1063 seg->p_vaddr = phdr->p_vaddr;
1064 seg->p_memsz = phdr->p_memsz;
1066 /* map the ELF header address if in this segment */
1067 if (phdr->p_offset == 0)
1068 params->elfhdr_addr = seg->addr;
1070 /* clear the bit between beginning of mapping and beginning of
1072 if (prot & PROT_WRITE && disp > 0) {
1073 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1074 clear_user((void __user *) maddr, disp);
1078 /* clear any space allocated but not loaded
1079 * - on uClinux we can just clear the lot
1080 * - on MMU linux we'll get a SIGBUS beyond the last page
1081 * extant in the file
1083 excess = phdr->p_memsz - phdr->p_filesz;
1084 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1087 if (excess > excess1) {
1088 unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1089 unsigned long xmaddr;
1091 flags |= MAP_FIXED | MAP_ANONYMOUS;
1092 down_write(&mm->mmap_sem);
1093 xmaddr = do_mmap(NULL, xaddr, excess - excess1,
1095 up_write(&mm->mmap_sem);
1097 kdebug("mmap[%d] <anon>"
1098 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1099 loop, xaddr, excess - excess1, prot, flags,
1102 if (xmaddr != xaddr)
1106 if (prot & PROT_WRITE && excess1 > 0) {
1107 kdebug("clear[%d] ad=%lx sz=%lx",
1108 loop, maddr + phdr->p_filesz, excess1);
1109 clear_user((void __user *) maddr + phdr->p_filesz,
1115 kdebug("clear[%d] ad=%lx sz=%lx",
1116 loop, maddr + phdr->p_filesz, excess);
1117 clear_user((void *) maddr + phdr->p_filesz, excess);
1122 if (phdr->p_flags & PF_X) {
1123 mm->start_code = maddr;
1124 mm->end_code = maddr + phdr->p_memsz;
1125 } else if (!mm->start_data) {
1126 mm->start_data = maddr;
1127 mm->end_data = maddr + phdr->p_memsz;
1137 /*****************************************************************************/
1139 * ELF-FDPIC core dumper
1141 * Modelled on fs/exec.c:aout_core_dump()
1142 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1144 * Modelled on fs/binfmt_elf.c core dumper
1146 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1149 * These are the only things you should do on a core-file: use only these
1150 * functions to write out all the necessary info.
1152 static int dump_write(struct file *file, const void *addr, int nr)
1154 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1157 static int dump_seek(struct file *file, loff_t off)
1159 if (file->f_op->llseek) {
1160 if (file->f_op->llseek(file, off, SEEK_SET) != off)
1169 * Decide whether a segment is worth dumping; default is yes to be
1170 * sure (missing info is worse than too much; etc).
1171 * Personally I'd include everything, and use the coredump limit...
1173 * I think we should skip something. But I am not sure how. H.J.
1175 static int maydump(struct vm_area_struct *vma)
1177 /* Do not dump I/O mapped devices or special mappings */
1178 if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
1179 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1183 /* If we may not read the contents, don't allow us to dump
1184 * them either. "dump_write()" can't handle it anyway.
1186 if (!(vma->vm_flags & VM_READ)) {
1187 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1191 /* Dump shared memory only if mapped from an anonymous file. */
1192 if (vma->vm_flags & VM_SHARED) {
1193 if (vma->vm_file->f_dentry->d_inode->i_nlink == 0) {
1194 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1198 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1203 /* If it hasn't been written to, don't write it out */
1204 if (!vma->anon_vma) {
1205 kdcore("%08lx: %08lx: no (!anon)", vma->vm_start, vma->vm_flags);
1210 kdcore("%08lx: %08lx: yes", vma->vm_start, vma->vm_flags);
1214 /* An ELF note in memory */
1219 unsigned int datasz;
1223 static int notesize(struct memelfnote *en)
1227 sz = sizeof(struct elf_note);
1228 sz += roundup(strlen(en->name) + 1, 4);
1229 sz += roundup(en->datasz, 4);
1236 #define DUMP_WRITE(addr, nr) \
1237 do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1238 #define DUMP_SEEK(off) \
1239 do { if (!dump_seek(file, (off))) return 0; } while(0)
1241 static int writenote(struct memelfnote *men, struct file *file)
1245 en.n_namesz = strlen(men->name) + 1;
1246 en.n_descsz = men->datasz;
1247 en.n_type = men->type;
1249 DUMP_WRITE(&en, sizeof(en));
1250 DUMP_WRITE(men->name, en.n_namesz);
1251 /* XXX - cast from long long to long to avoid need for libgcc.a */
1252 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1253 DUMP_WRITE(men->data, men->datasz);
1254 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1261 #define DUMP_WRITE(addr, nr) \
1262 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1264 #define DUMP_SEEK(off) \
1265 if (!dump_seek(file, (off))) \
1268 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1270 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1271 elf->e_ident[EI_CLASS] = ELF_CLASS;
1272 elf->e_ident[EI_DATA] = ELF_DATA;
1273 elf->e_ident[EI_VERSION] = EV_CURRENT;
1274 elf->e_ident[EI_OSABI] = ELF_OSABI;
1275 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1277 elf->e_type = ET_CORE;
1278 elf->e_machine = ELF_ARCH;
1279 elf->e_version = EV_CURRENT;
1281 elf->e_phoff = sizeof(struct elfhdr);
1283 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1284 elf->e_ehsize = sizeof(struct elfhdr);
1285 elf->e_phentsize = sizeof(struct elf_phdr);
1286 elf->e_phnum = segs;
1287 elf->e_shentsize = 0;
1289 elf->e_shstrndx = 0;
1293 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1295 phdr->p_type = PT_NOTE;
1296 phdr->p_offset = offset;
1299 phdr->p_filesz = sz;
1306 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1307 unsigned int sz, void *data)
1317 * fill up all the fields in prstatus from the given task struct, except
1318 * registers which need to be filled up seperately.
1320 static void fill_prstatus(struct elf_prstatus *prstatus,
1321 struct task_struct *p, long signr)
1323 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1324 prstatus->pr_sigpend = p->pending.signal.sig[0];
1325 prstatus->pr_sighold = p->blocked.sig[0];
1326 prstatus->pr_pid = p->pid;
1327 prstatus->pr_ppid = p->parent->pid;
1328 prstatus->pr_pgrp = process_group(p);
1329 prstatus->pr_sid = p->signal->session;
1330 if (thread_group_leader(p)) {
1332 * This is the record for the group leader. Add in the
1333 * cumulative times of previous dead threads. This total
1334 * won't include the time of each live thread whose state
1335 * is included in the core dump. The final total reported
1336 * to our parent process when it calls wait4 will include
1337 * those sums as well as the little bit more time it takes
1338 * this and each other thread to finish dying after the
1339 * core dump synchronization phase.
1341 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1342 &prstatus->pr_utime);
1343 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1344 &prstatus->pr_stime);
1346 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1347 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1349 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1350 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1352 prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1353 prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1356 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1357 struct mm_struct *mm)
1359 unsigned int i, len;
1361 /* first copy the parameters from user space */
1362 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1364 len = mm->arg_end - mm->arg_start;
1365 if (len >= ELF_PRARGSZ)
1366 len = ELF_PRARGSZ - 1;
1367 if (copy_from_user(&psinfo->pr_psargs,
1368 (const char __user *) mm->arg_start, len))
1370 for (i = 0; i < len; i++)
1371 if (psinfo->pr_psargs[i] == 0)
1372 psinfo->pr_psargs[i] = ' ';
1373 psinfo->pr_psargs[len] = 0;
1375 psinfo->pr_pid = p->pid;
1376 psinfo->pr_ppid = p->parent->pid;
1377 psinfo->pr_pgrp = process_group(p);
1378 psinfo->pr_sid = p->signal->session;
1380 i = p->state ? ffz(~p->state) + 1 : 0;
1381 psinfo->pr_state = i;
1382 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1383 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1384 psinfo->pr_nice = task_nice(p);
1385 psinfo->pr_flag = p->flags;
1386 SET_UID(psinfo->pr_uid, p->uid);
1387 SET_GID(psinfo->pr_gid, p->gid);
1388 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1393 /* Here is the structure in which status of each thread is captured. */
1394 struct elf_thread_status
1396 struct list_head list;
1397 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1398 elf_fpregset_t fpu; /* NT_PRFPREG */
1399 struct task_struct *thread;
1400 #ifdef ELF_CORE_COPY_XFPREGS
1401 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1403 struct memelfnote notes[3];
1408 * In order to add the specific thread information for the elf file format,
1409 * we need to keep a linked list of every thread's pr_status and then create
1410 * a single section for them in the final core file.
1412 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1414 struct task_struct *p = t->thread;
1419 fill_prstatus(&t->prstatus, p, signr);
1420 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1422 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1425 sz += notesize(&t->notes[0]);
1427 t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1428 if (t->prstatus.pr_fpvalid) {
1429 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1432 sz += notesize(&t->notes[1]);
1435 #ifdef ELF_CORE_COPY_XFPREGS
1436 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1437 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1440 sz += notesize(&t->notes[2]);
1447 * dump the segments for an MMU process
1450 static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1451 size_t *size, unsigned long *limit)
1453 struct vm_area_struct *vma;
1455 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1461 for (addr = vma->vm_start;
1465 struct vm_area_struct *vma;
1468 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1469 &page, &vma) <= 0) {
1470 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1472 else if (page == ZERO_PAGE(addr)) {
1473 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1474 page_cache_release(page);
1479 flush_cache_page(vma, addr, page_to_pfn(page));
1481 if ((*size += PAGE_SIZE) > *limit ||
1482 !dump_write(file, kaddr, PAGE_SIZE)
1485 page_cache_release(page);
1489 page_cache_release(page);
1502 * dump the segments for a NOMMU process
1505 static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1506 size_t *size, unsigned long *limit)
1508 struct vm_list_struct *vml;
1510 for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
1511 struct vm_area_struct *vma = vml->vma;
1516 if ((*size += PAGE_SIZE) > *limit)
1519 if (!dump_write(file, (void *) vma->vm_start,
1520 vma->vm_end - vma->vm_start))
1531 * This is a two-pass process; first we find the offsets of the bits,
1532 * and then they are actually written out. If we run out of core limit
1535 static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
1544 struct vm_area_struct *vma;
1545 struct elfhdr *elf = NULL;
1546 loff_t offset = 0, dataoff;
1547 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1549 struct memelfnote *notes = NULL;
1550 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1551 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1552 struct task_struct *g, *p;
1553 LIST_HEAD(thread_list);
1554 struct list_head *t;
1555 elf_fpregset_t *fpu = NULL;
1556 #ifdef ELF_CORE_COPY_XFPREGS
1557 elf_fpxregset_t *xfpu = NULL;
1559 int thread_status_size = 0;
1561 struct vm_list_struct *vml;
1566 * We no longer stop all VM operations.
1568 * This is because those proceses that could possibly change map_count
1569 * or the mmap / vma pages are now blocked in do_exit on current
1570 * finishing this core dump.
1572 * Only ptrace can touch these memory addresses, but it doesn't change
1573 * the map_count or the pages allocated. So no possibility of crashing
1574 * exists while dumping the mm->vm_next areas to the core file.
1577 /* alloc memory for large data structures: too large to be on stack */
1578 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1581 prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1584 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1587 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1590 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1593 #ifdef ELF_CORE_COPY_XFPREGS
1594 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1600 struct elf_thread_status *tmp;
1601 read_lock(&tasklist_lock);
1603 if (current->mm == p->mm && current != p) {
1604 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1606 read_unlock(&tasklist_lock);
1609 INIT_LIST_HEAD(&tmp->list);
1611 list_add(&tmp->list, &thread_list);
1613 while_each_thread(g,p);
1614 read_unlock(&tasklist_lock);
1615 list_for_each(t, &thread_list) {
1616 struct elf_thread_status *tmp;
1619 tmp = list_entry(t, struct elf_thread_status, list);
1620 sz = elf_dump_thread_status(signr, tmp);
1621 thread_status_size += sz;
1625 /* now collect the dump for the current */
1626 fill_prstatus(prstatus, current, signr);
1627 elf_core_copy_regs(&prstatus->pr_reg, regs);
1630 segs = current->mm->map_count;
1633 for (vml = current->mm->context.vmlist; vml; vml = vml->next)
1636 #ifdef ELF_CORE_EXTRA_PHDRS
1637 segs += ELF_CORE_EXTRA_PHDRS;
1641 fill_elf_fdpic_header(elf, segs + 1); /* including notes section */
1644 current->flags |= PF_DUMPCORE;
1647 * Set up the notes in similar form to SVR4 core dumps made
1648 * with info from their /proc.
1651 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1652 fill_psinfo(psinfo, current->group_leader, current->mm);
1653 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1657 auxv = (elf_addr_t *) current->mm->saved_auxv;
1662 while (auxv[i - 2] != AT_NULL);
1663 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1664 i * sizeof(elf_addr_t), auxv);
1666 /* Try to dump the FPU. */
1667 if ((prstatus->pr_fpvalid =
1668 elf_core_copy_task_fpregs(current, regs, fpu)))
1669 fill_note(notes + numnote++,
1670 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1671 #ifdef ELF_CORE_COPY_XFPREGS
1672 if (elf_core_copy_task_xfpregs(current, xfpu))
1673 fill_note(notes + numnote++,
1674 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1680 DUMP_WRITE(elf, sizeof(*elf));
1681 offset += sizeof(*elf); /* Elf header */
1682 offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
1684 /* Write notes phdr entry */
1686 struct elf_phdr phdr;
1689 for (i = 0; i < numnote; i++)
1690 sz += notesize(notes + i);
1692 sz += thread_status_size;
1694 fill_elf_note_phdr(&phdr, sz, offset);
1696 DUMP_WRITE(&phdr, sizeof(phdr));
1699 /* Page-align dumped data */
1700 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1702 /* write program headers for segments dump */
1705 vma = current->mm->mmap; vma; vma = vma->vm_next
1707 vml = current->mm->context.vmlist; vml; vml = vml->next
1710 struct elf_phdr phdr;
1717 sz = vma->vm_end - vma->vm_start;
1719 phdr.p_type = PT_LOAD;
1720 phdr.p_offset = offset;
1721 phdr.p_vaddr = vma->vm_start;
1723 phdr.p_filesz = maydump(vma) ? sz : 0;
1725 offset += phdr.p_filesz;
1726 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1727 if (vma->vm_flags & VM_WRITE)
1728 phdr.p_flags |= PF_W;
1729 if (vma->vm_flags & VM_EXEC)
1730 phdr.p_flags |= PF_X;
1731 phdr.p_align = ELF_EXEC_PAGESIZE;
1733 DUMP_WRITE(&phdr, sizeof(phdr));
1736 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1737 ELF_CORE_WRITE_EXTRA_PHDRS;
1740 /* write out the notes section */
1741 for (i = 0; i < numnote; i++)
1742 if (!writenote(notes + i, file))
1745 /* write out the thread status notes section */
1746 list_for_each(t, &thread_list) {
1747 struct elf_thread_status *tmp =
1748 list_entry(t, struct elf_thread_status, list);
1750 for (i = 0; i < tmp->num_notes; i++)
1751 if (!writenote(&tmp->notes[i], file))
1757 if (elf_fdpic_dump_segments(file, current->mm, &size, &limit) < 0)
1760 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1761 ELF_CORE_WRITE_EXTRA_DATA;
1764 if (file->f_pos != offset) {
1767 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1768 file->f_pos, offset);
1775 while (!list_empty(&thread_list)) {
1776 struct list_head *tmp = thread_list.next;
1778 kfree(list_entry(tmp, struct elf_thread_status, list));
1786 #ifdef ELF_CORE_COPY_XFPREGS
1793 #endif /* USE_ELF_CORE_DUMP */