1 /****************************************************************************/
3 * linux/fs/binfmt_flat.c
5 * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
6 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
7 * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
8 * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
11 * linux/fs/binfmt_aout.c:
12 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
13 * linux/fs/binfmt_flat.c for 2.0 kernel
14 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
15 * JAN/99 -- coded full program relocation (gerg@snapgear.com)
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
23 #include <linux/mman.h>
24 #include <linux/errno.h>
25 #include <linux/signal.h>
26 #include <linux/string.h>
28 #include <linux/file.h>
29 #include <linux/ptrace.h>
30 #include <linux/user.h>
31 #include <linux/slab.h>
32 #include <linux/binfmts.h>
33 #include <linux/personality.h>
34 #include <linux/init.h>
35 #include <linux/flat.h>
36 #include <linux/uaccess.h>
38 #include <asm/byteorder.h>
39 #include <asm/unaligned.h>
40 #include <asm/cacheflush.h>
43 /****************************************************************************/
46 * User data (data section and bss) needs to be aligned.
47 * We pick 0x20 here because it is the max value elf2flt has always
48 * used in producing FLAT files, and because it seems to be large
49 * enough to make all the gcc alignment related tests happy.
51 #define FLAT_DATA_ALIGN (0x20)
54 * User data (stack) also needs to be aligned.
55 * Here we can be a bit looser than the data sections since this
56 * needs to only meet arch ABI requirements.
58 #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN)
60 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
61 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
65 unsigned long start_code; /* Start of text segment */
66 unsigned long start_data; /* Start of data segment */
67 unsigned long start_brk; /* End of data segment */
68 unsigned long text_len; /* Length of text segment */
69 unsigned long entry; /* Start address for this module */
70 unsigned long build_date; /* When this one was compiled */
71 bool loaded; /* Has this library been loaded? */
72 } lib_list[MAX_SHARED_LIBS];
75 #ifdef CONFIG_BINFMT_SHARED_FLAT
76 static int load_flat_shared_library(int id, struct lib_info *p);
79 static int load_flat_binary(struct linux_binprm *);
80 static int flat_core_dump(struct coredump_params *cprm);
82 static struct linux_binfmt flat_format = {
83 .module = THIS_MODULE,
84 .load_binary = load_flat_binary,
85 .core_dump = flat_core_dump,
86 .min_coredump = PAGE_SIZE
89 /****************************************************************************/
91 * Routine writes a core dump image in the current directory.
92 * Currently only a stub-function.
95 static int flat_core_dump(struct coredump_params *cprm)
97 pr_warn("Process %s:%d received signr %d and should have core dumped\n",
98 current->comm, current->pid, cprm->siginfo->si_signo);
102 /****************************************************************************/
104 * create_flat_tables() parses the env- and arg-strings in new user
105 * memory and creates the pointer tables from them, and puts their
106 * addresses on the "stack", returning the new stack pointer value.
109 static unsigned long create_flat_tables(
111 struct linux_binprm *bprm)
113 unsigned long *argv, *envp;
115 char *p = (char *)pp;
116 int argc = bprm->argc;
117 int envc = bprm->envc;
118 char uninitialized_var(dummy);
120 sp = (unsigned long *)p;
121 sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
122 sp = (unsigned long *) ((unsigned long)sp & -FLAT_STACK_ALIGN);
123 argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
124 envp = argv + (argc + 1);
126 if (flat_argvp_envp_on_stack()) {
127 put_user((unsigned long) envp, sp + 2);
128 put_user((unsigned long) argv, sp + 1);
132 current->mm->arg_start = (unsigned long) p;
134 put_user((unsigned long) p, argv++);
136 get_user(dummy, p); p++;
139 put_user((unsigned long) NULL, argv);
140 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
142 put_user((unsigned long)p, envp); envp++;
144 get_user(dummy, p); p++;
147 put_user((unsigned long) NULL, envp);
148 current->mm->env_end = (unsigned long) p;
149 return (unsigned long)sp;
152 /****************************************************************************/
154 #ifdef CONFIG_BINFMT_ZFLAT
156 #include <linux/zlib.h>
158 #define LBUFSIZE 4000
161 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
162 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
163 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
164 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
165 #define COMMENT 0x10 /* bit 4 set: file comment present */
166 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
167 #define RESERVED 0xC0 /* bit 6,7: reserved */
169 static int decompress_exec(
170 struct linux_binprm *bprm,
171 unsigned long offset,
181 pr_debug("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len);
183 memset(&strm, 0, sizeof(strm));
184 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
185 if (strm.workspace == NULL) {
186 pr_debug("no memory for decompress workspace\n");
189 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
191 pr_debug("no memory for read buffer\n");
196 /* Read in first chunk of data and parse gzip header. */
198 ret = kernel_read(bprm->file, offset, buf, LBUFSIZE);
207 /* Check minimum size -- gzip header */
209 pr_debug("file too small?\n");
213 /* Check gzip magic number */
214 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
215 pr_debug("unknown compression magic?\n");
219 /* Check gzip method */
221 pr_debug("unknown compression method?\n");
224 /* Check gzip flags */
225 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
226 (buf[3] & RESERVED)) {
227 pr_debug("unknown flags?\n");
232 if (buf[3] & EXTRA_FIELD) {
233 ret += 2 + buf[10] + (buf[11] << 8);
234 if (unlikely(ret >= LBUFSIZE)) {
235 pr_debug("buffer overflow (EXTRA)?\n");
239 if (buf[3] & ORIG_NAME) {
240 while (ret < LBUFSIZE && buf[ret++] != 0)
242 if (unlikely(ret == LBUFSIZE)) {
243 pr_debug("buffer overflow (ORIG_NAME)?\n");
247 if (buf[3] & COMMENT) {
248 while (ret < LBUFSIZE && buf[ret++] != 0)
250 if (unlikely(ret == LBUFSIZE)) {
251 pr_debug("buffer overflow (COMMENT)?\n");
257 strm.avail_in -= ret;
260 strm.avail_out = len;
263 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
264 pr_debug("zlib init failed?\n");
268 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
269 ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE);
281 pr_debug("decompression failed (%d), %s\n",
288 zlib_inflateEnd(&strm);
292 kfree(strm.workspace);
296 #endif /* CONFIG_BINFMT_ZFLAT */
298 /****************************************************************************/
301 calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
305 unsigned long start_brk;
306 unsigned long start_data;
307 unsigned long text_len;
308 unsigned long start_code;
310 #ifdef CONFIG_BINFMT_SHARED_FLAT
312 id = curid; /* Relocs of 0 are always self referring */
314 id = (r >> 24) & 0xff; /* Find ID for this reloc */
315 r &= 0x00ffffff; /* Trim ID off here */
317 if (id >= MAX_SHARED_LIBS) {
318 pr_err("reference 0x%lx to shared library %d", r, id);
323 pr_err("reloc address 0x%lx not in same module "
324 "(%d != %d)", r, curid, id);
326 } else if (!p->lib_list[id].loaded &&
327 load_flat_shared_library(id, p) < 0) {
328 pr_err("failed to load library %d", id);
331 /* Check versioning information (i.e. time stamps) */
332 if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
333 p->lib_list[curid].build_date < p->lib_list[id].build_date) {
334 pr_err("library %d is younger than %d", id, curid);
342 start_brk = p->lib_list[id].start_brk;
343 start_data = p->lib_list[id].start_data;
344 start_code = p->lib_list[id].start_code;
345 text_len = p->lib_list[id].text_len;
347 if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
348 pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
349 r, start_brk-start_data+text_len, text_len);
353 if (r < text_len) /* In text segment */
354 addr = r + start_code;
355 else /* In data segment */
356 addr = r - text_len + start_data;
358 /* Range checked already above so doing the range tests is redundant...*/
362 pr_cont(", killing %s!\n", current->comm);
363 send_sig(SIGSEGV, current, 0);
368 /****************************************************************************/
370 static void old_reloc(unsigned long rl)
372 static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
377 #if defined(CONFIG_COLDFIRE)
378 ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset);
380 ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
383 pr_debug("Relocation of variable at DATASEG+%x "
384 "(address %p, currently %lx) into segment %s\n",
385 r.reloc.offset, ptr, *ptr, segment[r.reloc.type]);
387 switch (r.reloc.type) {
388 case OLD_FLAT_RELOC_TYPE_TEXT:
389 *ptr += current->mm->start_code;
391 case OLD_FLAT_RELOC_TYPE_DATA:
392 *ptr += current->mm->start_data;
394 case OLD_FLAT_RELOC_TYPE_BSS:
395 *ptr += current->mm->end_data;
398 pr_err("Unknown relocation type=%x\n", r.reloc.type);
402 pr_debug("Relocation became %lx\n", *ptr);
405 /****************************************************************************/
407 static int load_flat_file(struct linux_binprm *bprm,
408 struct lib_info *libinfo, int id, unsigned long *extra_stack)
410 struct flat_hdr *hdr;
411 unsigned long textpos, datapos, realdatastart;
412 unsigned long text_len, data_len, bss_len, stack_len, full_data, flags;
413 unsigned long len, memp, memp_size, extra, rlim;
414 unsigned long *reloc, *rp;
418 unsigned long start_code, end_code;
422 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
423 inode = file_inode(bprm->file);
425 text_len = ntohl(hdr->data_start);
426 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
427 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
428 stack_len = ntohl(hdr->stack_size);
430 stack_len += *extra_stack;
431 *extra_stack = stack_len;
433 relocs = ntohl(hdr->reloc_count);
434 flags = ntohl(hdr->flags);
435 rev = ntohl(hdr->rev);
436 full_data = data_len + relocs * sizeof(unsigned long);
438 if (strncmp(hdr->magic, "bFLT", 4)) {
440 * Previously, here was a printk to tell people
441 * "BINFMT_FLAT: bad header magic".
442 * But for the kernel which also use ELF FD-PIC format, this
443 * error message is confusing.
444 * because a lot of people do not manage to produce good
450 if (flags & FLAT_FLAG_KTRACE)
451 pr_info("Loading file: %s\n", bprm->filename);
453 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
454 pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
455 rev, FLAT_VERSION, OLD_FLAT_VERSION);
460 /* Don't allow old format executables to use shared libraries */
461 if (rev == OLD_FLAT_VERSION && id != 0) {
462 pr_err("shared libraries are not available before rev 0x%lx\n",
469 * fix up the flags for the older format, there were all kinds
470 * of endian hacks, this only works for the simple cases
472 if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
473 flags = FLAT_FLAG_RAM;
475 #ifndef CONFIG_BINFMT_ZFLAT
476 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
477 pr_err("Support for ZFLAT executables is not enabled.\n");
484 * Check initial limits. This avoids letting people circumvent
485 * size limits imposed on them by creating programs with large
486 * arrays in the data or bss.
488 rlim = rlimit(RLIMIT_DATA);
489 if (rlim >= RLIM_INFINITY)
491 if (data_len + bss_len > rlim) {
496 /* Flush all traces of the currently running executable */
498 ret = flush_old_exec(bprm);
502 /* OK, This is the point of no return */
503 set_personality(PER_LINUX_32BIT);
504 setup_new_exec(bprm);
508 * calculate the extra space we need to map in
510 extra = max_t(unsigned long, bss_len + stack_len,
511 relocs * sizeof(unsigned long));
514 * there are a couple of cases here, the separate code/data
515 * case, and then the fully copied to RAM case which lumps
518 if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
520 * this should give us a ROM ptr, but if it doesn't we don't
523 pr_debug("ROM mapping of file (we hope)\n");
525 textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
526 MAP_PRIVATE|MAP_EXECUTABLE, 0);
527 if (!textpos || IS_ERR_VALUE(textpos)) {
531 pr_err("Unable to mmap process text, errno %d\n", ret);
535 len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
536 len = PAGE_ALIGN(len);
537 realdatastart = vm_mmap(NULL, 0, len,
538 PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
540 if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
544 pr_err("Unable to allocate RAM for process data, "
546 vm_munmap(textpos, text_len);
549 datapos = ALIGN(realdatastart +
550 MAX_SHARED_LIBS * sizeof(unsigned long),
553 pr_debug("Allocated data+bss+stack (%ld bytes): %lx\n",
554 data_len + bss_len + stack_len, datapos);
556 fpos = ntohl(hdr->data_start);
557 #ifdef CONFIG_BINFMT_ZFLAT
558 if (flags & FLAT_FLAG_GZDATA) {
559 result = decompress_exec(bprm, fpos, (char *)datapos,
564 result = read_code(bprm->file, datapos, fpos,
567 if (IS_ERR_VALUE(result)) {
569 pr_err("Unable to read data+bss, errno %d\n", ret);
570 vm_munmap(textpos, text_len);
571 vm_munmap(realdatastart, len);
575 reloc = (unsigned long *)
576 (datapos + (ntohl(hdr->reloc_start) - text_len));
577 memp = realdatastart;
581 len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
582 len = PAGE_ALIGN(len);
583 textpos = vm_mmap(NULL, 0, len,
584 PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
586 if (!textpos || IS_ERR_VALUE(textpos)) {
590 pr_err("Unable to allocate RAM for process text/data, "
595 realdatastart = textpos + ntohl(hdr->data_start);
596 datapos = ALIGN(realdatastart +
597 MAX_SHARED_LIBS * sizeof(unsigned long),
600 reloc = (unsigned long *)
601 (datapos + (ntohl(hdr->reloc_start) - text_len));
604 #ifdef CONFIG_BINFMT_ZFLAT
606 * load it all in and treat it like a RAM load from now on
608 if (flags & FLAT_FLAG_GZIP) {
609 result = decompress_exec(bprm, sizeof(struct flat_hdr),
610 (((char *)textpos) + sizeof(struct flat_hdr)),
611 (text_len + full_data
612 - sizeof(struct flat_hdr)),
614 memmove((void *) datapos, (void *) realdatastart,
616 } else if (flags & FLAT_FLAG_GZDATA) {
617 result = read_code(bprm->file, textpos, 0, text_len);
618 if (!IS_ERR_VALUE(result))
619 result = decompress_exec(bprm, text_len, (char *) datapos,
624 result = read_code(bprm->file, textpos, 0, text_len);
625 if (!IS_ERR_VALUE(result))
626 result = read_code(bprm->file, datapos,
627 ntohl(hdr->data_start),
630 if (IS_ERR_VALUE(result)) {
632 pr_err("Unable to read code+data+bss, errno %d\n", ret);
633 vm_munmap(textpos, text_len + data_len + extra +
634 MAX_SHARED_LIBS * sizeof(unsigned long));
639 start_code = textpos + sizeof(struct flat_hdr);
640 end_code = textpos + text_len;
641 text_len -= sizeof(struct flat_hdr); /* the real code len */
643 /* The main program needs a little extra setup in the task structure */
645 current->mm->start_code = start_code;
646 current->mm->end_code = end_code;
647 current->mm->start_data = datapos;
648 current->mm->end_data = datapos + data_len;
650 * set up the brk stuff, uses any slack left in data/bss/stack
651 * allocation. We put the brk after the bss (between the bss
652 * and stack) like other platforms.
653 * Userspace code relies on the stack pointer starting out at
654 * an address right at the end of a page.
656 current->mm->start_brk = datapos + data_len + bss_len;
657 current->mm->brk = (current->mm->start_brk + 3) & ~3;
658 current->mm->context.end_brk = memp + memp_size - stack_len;
661 if (flags & FLAT_FLAG_KTRACE) {
662 pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n",
663 textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
664 pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
665 id ? "Lib" : "Load", bprm->filename,
666 start_code, end_code, datapos, datapos + data_len,
667 datapos + data_len, (datapos + data_len + bss_len + 3) & ~3);
670 /* Store the current module values into the global library structure */
671 libinfo->lib_list[id].start_code = start_code;
672 libinfo->lib_list[id].start_data = datapos;
673 libinfo->lib_list[id].start_brk = datapos + data_len + bss_len;
674 libinfo->lib_list[id].text_len = text_len;
675 libinfo->lib_list[id].loaded = 1;
676 libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
677 libinfo->lib_list[id].build_date = ntohl(hdr->build_date);
680 * We just load the allocations into some temporary memory to
681 * help simplify all this mumbo jumbo
683 * We've got two different sections of relocation entries.
684 * The first is the GOT which resides at the beginning of the data segment
685 * and is terminated with a -1. This one can be relocated in place.
686 * The second is the extra relocation entries tacked after the image's
687 * data segment. These require a little more processing as the entry is
688 * really an offset into the image which contains an offset into the
691 if (flags & FLAT_FLAG_GOTPIC) {
692 for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) {
695 addr = calc_reloc(*rp, libinfo, id, 0);
696 if (addr == RELOC_FAILED) {
706 * Now run through the relocation entries.
707 * We've got to be careful here as C++ produces relocatable zero
708 * entries in the constructor and destructor tables which are then
709 * tested for being not zero (which will always occur unless we're
710 * based from address zero). This causes an endless loop as __start
711 * is at zero. The solution used is to not relocate zero addresses.
712 * This has the negative side effect of not allowing a global data
713 * reference to be statically initialised to _stext (I've moved
714 * __start to address 4 so that is okay).
716 if (rev > OLD_FLAT_VERSION) {
717 unsigned long persistent = 0;
718 for (i = 0; i < relocs; i++) {
719 unsigned long addr, relval;
722 * Get the address of the pointer to be
723 * relocated (of course, the address has to be
726 relval = ntohl(reloc[i]);
727 if (flat_set_persistent(relval, &persistent))
729 addr = flat_get_relocate_addr(relval);
730 rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
731 if (rp == (unsigned long *)RELOC_FAILED) {
736 /* Get the pointer's value. */
737 addr = flat_get_addr_from_rp(rp, relval, flags,
741 * Do the relocation. PIC relocs in the data section are
742 * already in target order
744 if ((flags & FLAT_FLAG_GOTPIC) == 0)
746 addr = calc_reloc(addr, libinfo, id, 0);
747 if (addr == RELOC_FAILED) {
752 /* Write back the relocated pointer. */
753 flat_put_addr_at_rp(rp, addr, relval);
757 for (i = 0; i < relocs; i++)
758 old_reloc(ntohl(reloc[i]));
761 flush_icache_range(start_code, end_code);
763 /* zero the BSS, BRK and stack areas */
764 memset((void *)(datapos + data_len), 0, bss_len +
765 (memp + memp_size - stack_len - /* end brk */
766 libinfo->lib_list[id].start_brk) + /* start brk */
775 /****************************************************************************/
776 #ifdef CONFIG_BINFMT_SHARED_FLAT
779 * Load a shared library into memory. The library gets its own data
780 * segment (including bss) but not argv/argc/environ.
783 static int load_flat_shared_library(int id, struct lib_info *libs)
785 struct linux_binprm bprm;
789 memset(&bprm, 0, sizeof(bprm));
791 /* Create the file name */
792 sprintf(buf, "/lib/lib%d.so", id);
794 /* Open the file up */
796 bprm.file = open_exec(bprm.filename);
797 res = PTR_ERR(bprm.file);
798 if (IS_ERR(bprm.file))
801 bprm.cred = prepare_exec_creds();
806 /* We don't really care about recalculating credentials at this point
807 * as we're past the point of no return and are dealing with shared
810 bprm.cred_prepared = 1;
812 res = prepare_binprm(&bprm);
815 res = load_flat_file(&bprm, libs, id, NULL);
817 abort_creds(bprm.cred);
820 allow_write_access(bprm.file);
826 #endif /* CONFIG_BINFMT_SHARED_FLAT */
827 /****************************************************************************/
830 * These are the functions used to load flat style executables and shared
831 * libraries. There is no binary dependent code anywhere else.
834 static int load_flat_binary(struct linux_binprm *bprm)
836 struct lib_info libinfo;
837 struct pt_regs *regs = current_pt_regs();
838 unsigned long p = bprm->p;
839 unsigned long stack_len;
840 unsigned long start_addr;
845 memset(&libinfo, 0, sizeof(libinfo));
848 * We have to add the size of our arguments to our stack size
849 * otherwise it's too easy for users to create stack overflows
850 * by passing in a huge argument list. And yes, we have to be
851 * pedantic and include space for the argv/envp array as it may have
854 #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
855 stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
856 stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
857 stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
858 stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */
860 res = load_flat_file(bprm, &libinfo, 0, &stack_len);
864 /* Update data segment pointers for all libraries */
865 for (i = 0; i < MAX_SHARED_LIBS; i++)
866 if (libinfo.lib_list[i].loaded)
867 for (j = 0; j < MAX_SHARED_LIBS; j++)
868 (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] =
869 (libinfo.lib_list[j].loaded) ?
870 libinfo.lib_list[j].start_data : UNLOADED_LIB;
872 install_exec_creds(bprm);
874 set_binfmt(&flat_format);
876 p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
877 pr_debug("p=%lx\n", p);
879 /* copy the arg pages onto the stack, this could be more efficient :-) */
880 for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
882 ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
884 sp = (unsigned long *) create_flat_tables(p, bprm);
886 /* Fake some return addresses to ensure the call chain will
887 * initialise library in order for us. We are required to call
888 * lib 1 first, then 2, ... and finally the main program (id 0).
890 start_addr = libinfo.lib_list[0].entry;
892 #ifdef CONFIG_BINFMT_SHARED_FLAT
893 for (i = MAX_SHARED_LIBS-1; i > 0; i--) {
894 if (libinfo.lib_list[i].loaded) {
895 /* Push previos first to call address */
896 --sp; put_user(start_addr, sp);
897 start_addr = libinfo.lib_list[i].entry;
902 /* Stash our initial stack pointer into the mm structure */
903 current->mm->start_stack = (unsigned long)sp;
905 #ifdef FLAT_PLAT_INIT
906 FLAT_PLAT_INIT(regs);
909 pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
910 regs, start_addr, current->mm->start_stack);
911 start_thread(regs, start_addr, current->mm->start_stack);
916 /****************************************************************************/
918 static int __init init_flat_binfmt(void)
920 register_binfmt(&flat_format);
923 core_initcall(init_flat_binfmt);
925 /****************************************************************************/