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 #include <linux/kernel.h>
19 #include <linux/sched.h>
21 #include <linux/mman.h>
22 #include <linux/errno.h>
23 #include <linux/signal.h>
24 #include <linux/string.h>
26 #include <linux/file.h>
27 #include <linux/ptrace.h>
28 #include <linux/user.h>
29 #include <linux/slab.h>
30 #include <linux/binfmts.h>
31 #include <linux/personality.h>
32 #include <linux/init.h>
33 #include <linux/flat.h>
34 #include <linux/uaccess.h>
36 #include <asm/byteorder.h>
37 #include <asm/unaligned.h>
38 #include <asm/cacheflush.h>
41 /****************************************************************************/
48 #define DBG_FLT(a...) printk(a)
54 * User data (data section and bss) needs to be aligned.
55 * We pick 0x20 here because it is the max value elf2flt has always
56 * used in producing FLAT files, and because it seems to be large
57 * enough to make all the gcc alignment related tests happy.
59 #define FLAT_DATA_ALIGN (0x20)
62 * User data (stack) also needs to be aligned.
63 * Here we can be a bit looser than the data sections since this
64 * needs to only meet arch ABI requirements.
66 #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN)
68 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
69 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
73 unsigned long start_code; /* Start of text segment */
74 unsigned long start_data; /* Start of data segment */
75 unsigned long start_brk; /* End of data segment */
76 unsigned long text_len; /* Length of text segment */
77 unsigned long entry; /* Start address for this module */
78 unsigned long build_date; /* When this one was compiled */
79 bool loaded; /* Has this library been loaded? */
80 } lib_list[MAX_SHARED_LIBS];
83 #ifdef CONFIG_BINFMT_SHARED_FLAT
84 static int load_flat_shared_library(int id, struct lib_info *p);
87 static int load_flat_binary(struct linux_binprm *);
88 static int flat_core_dump(struct coredump_params *cprm);
90 static struct linux_binfmt flat_format = {
91 .module = THIS_MODULE,
92 .load_binary = load_flat_binary,
93 .core_dump = flat_core_dump,
94 .min_coredump = PAGE_SIZE
97 /****************************************************************************/
99 * Routine writes a core dump image in the current directory.
100 * Currently only a stub-function.
103 static int flat_core_dump(struct coredump_params *cprm)
105 printk("Process %s:%d received signr %d and should have core dumped\n",
106 current->comm, current->pid, cprm->siginfo->si_signo);
110 /****************************************************************************/
112 * create_flat_tables() parses the env- and arg-strings in new user
113 * memory and creates the pointer tables from them, and puts their
114 * addresses on the "stack", returning the new stack pointer value.
117 static unsigned long create_flat_tables(
119 struct linux_binprm *bprm)
121 unsigned long *argv, *envp;
123 char *p = (char *)pp;
124 int argc = bprm->argc;
125 int envc = bprm->envc;
126 char uninitialized_var(dummy);
128 sp = (unsigned long *)p;
129 sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
130 sp = (unsigned long *) ((unsigned long)sp & -FLAT_STACK_ALIGN);
131 argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
132 envp = argv + (argc + 1);
134 if (flat_argvp_envp_on_stack()) {
135 put_user((unsigned long) envp, sp + 2);
136 put_user((unsigned long) argv, sp + 1);
140 current->mm->arg_start = (unsigned long) p;
142 put_user((unsigned long) p, argv++);
144 get_user(dummy, p); p++;
147 put_user((unsigned long) NULL, argv);
148 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
150 put_user((unsigned long)p, envp); envp++;
152 get_user(dummy, p); p++;
155 put_user((unsigned long) NULL, envp);
156 current->mm->env_end = (unsigned long) p;
157 return (unsigned long)sp;
160 /****************************************************************************/
162 #ifdef CONFIG_BINFMT_ZFLAT
164 #include <linux/zlib.h>
166 #define LBUFSIZE 4000
169 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
170 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
171 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
172 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
173 #define COMMENT 0x10 /* bit 4 set: file comment present */
174 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
175 #define RESERVED 0xC0 /* bit 6,7: reserved */
177 static int decompress_exec(
178 struct linux_binprm *bprm,
179 unsigned long offset,
189 DBG_FLT("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len);
191 memset(&strm, 0, sizeof(strm));
192 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
193 if (strm.workspace == NULL) {
194 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
197 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
199 DBG_FLT("binfmt_flat: no memory for read buffer\n");
204 /* Read in first chunk of data and parse gzip header. */
206 ret = kernel_read(bprm->file, offset, buf, LBUFSIZE);
215 /* Check minimum size -- gzip header */
217 DBG_FLT("binfmt_flat: file too small?\n");
221 /* Check gzip magic number */
222 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
223 DBG_FLT("binfmt_flat: unknown compression magic?\n");
227 /* Check gzip method */
229 DBG_FLT("binfmt_flat: unknown compression method?\n");
232 /* Check gzip flags */
233 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
234 (buf[3] & RESERVED)) {
235 DBG_FLT("binfmt_flat: unknown flags?\n");
240 if (buf[3] & EXTRA_FIELD) {
241 ret += 2 + buf[10] + (buf[11] << 8);
242 if (unlikely(ret >= LBUFSIZE)) {
243 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
247 if (buf[3] & ORIG_NAME) {
248 while (ret < LBUFSIZE && buf[ret++] != 0)
250 if (unlikely(ret == LBUFSIZE)) {
251 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
255 if (buf[3] & COMMENT) {
256 while (ret < LBUFSIZE && buf[ret++] != 0)
258 if (unlikely(ret == LBUFSIZE)) {
259 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
265 strm.avail_in -= ret;
268 strm.avail_out = len;
271 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
272 DBG_FLT("binfmt_flat: zlib init failed?\n");
276 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
277 ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE);
289 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
296 zlib_inflateEnd(&strm);
300 kfree(strm.workspace);
304 #endif /* CONFIG_BINFMT_ZFLAT */
306 /****************************************************************************/
309 calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
313 unsigned long start_brk;
314 unsigned long start_data;
315 unsigned long text_len;
316 unsigned long start_code;
318 #ifdef CONFIG_BINFMT_SHARED_FLAT
320 id = curid; /* Relocs of 0 are always self referring */
322 id = (r >> 24) & 0xff; /* Find ID for this reloc */
323 r &= 0x00ffffff; /* Trim ID off here */
325 if (id >= MAX_SHARED_LIBS) {
326 printk("BINFMT_FLAT: reference 0x%lx to shared library %d",
332 printk("BINFMT_FLAT: reloc address 0x%lx not in same module "
333 "(%d != %d)", r, curid, id);
335 } else if (!p->lib_list[id].loaded &&
336 load_flat_shared_library(id, p) < 0) {
337 printk("BINFMT_FLAT: failed to load library %d", id);
340 /* Check versioning information (i.e. time stamps) */
341 if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
342 p->lib_list[curid].build_date < p->lib_list[id].build_date) {
343 printk("BINFMT_FLAT: library %d is younger than %d", id, curid);
351 start_brk = p->lib_list[id].start_brk;
352 start_data = p->lib_list[id].start_data;
353 start_code = p->lib_list[id].start_code;
354 text_len = p->lib_list[id].text_len;
356 if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
357 printk("BINFMT_FLAT: reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
358 r, start_brk-start_data+text_len, text_len);
362 if (r < text_len) /* In text segment */
363 addr = r + start_code;
364 else /* In data segment */
365 addr = r - text_len + start_data;
367 /* Range checked already above so doing the range tests is redundant...*/
371 printk(", killing %s!\n", current->comm);
372 send_sig(SIGSEGV, current, 0);
377 /****************************************************************************/
379 static void old_reloc(unsigned long rl)
382 static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
388 #if defined(CONFIG_COLDFIRE)
389 ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset);
391 ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
395 printk("Relocation of variable at DATASEG+%x "
396 "(address %p, currently %lx) into segment %s\n",
397 r.reloc.offset, ptr, *ptr, segment[r.reloc.type]);
400 switch (r.reloc.type) {
401 case OLD_FLAT_RELOC_TYPE_TEXT:
402 *ptr += current->mm->start_code;
404 case OLD_FLAT_RELOC_TYPE_DATA:
405 *ptr += current->mm->start_data;
407 case OLD_FLAT_RELOC_TYPE_BSS:
408 *ptr += current->mm->end_data;
411 printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type);
416 printk("Relocation became %lx\n", *ptr);
420 /****************************************************************************/
422 static int load_flat_file(struct linux_binprm *bprm,
423 struct lib_info *libinfo, int id, unsigned long *extra_stack)
425 struct flat_hdr *hdr;
426 unsigned long textpos, datapos, realdatastart;
427 unsigned long text_len, data_len, bss_len, stack_len, full_data, flags;
428 unsigned long len, memp, memp_size, extra, rlim;
429 unsigned long *reloc, *rp;
433 unsigned long start_code, end_code;
437 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
438 inode = file_inode(bprm->file);
440 text_len = ntohl(hdr->data_start);
441 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
442 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
443 stack_len = ntohl(hdr->stack_size);
445 stack_len += *extra_stack;
446 *extra_stack = stack_len;
448 relocs = ntohl(hdr->reloc_count);
449 flags = ntohl(hdr->flags);
450 rev = ntohl(hdr->rev);
451 full_data = data_len + relocs * sizeof(unsigned long);
453 if (strncmp(hdr->magic, "bFLT", 4)) {
455 * Previously, here was a printk to tell people
456 * "BINFMT_FLAT: bad header magic".
457 * But for the kernel which also use ELF FD-PIC format, this
458 * error message is confusing.
459 * because a lot of people do not manage to produce good
465 if (flags & FLAT_FLAG_KTRACE)
466 printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
468 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
469 printk("BINFMT_FLAT: bad flat file version 0x%x (supported "
470 "0x%lx and 0x%lx)\n",
471 rev, FLAT_VERSION, OLD_FLAT_VERSION);
476 /* Don't allow old format executables to use shared libraries */
477 if (rev == OLD_FLAT_VERSION && id != 0) {
478 printk("BINFMT_FLAT: shared libraries are not available before rev 0x%lx\n",
485 * fix up the flags for the older format, there were all kinds
486 * of endian hacks, this only works for the simple cases
488 if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
489 flags = FLAT_FLAG_RAM;
491 #ifndef CONFIG_BINFMT_ZFLAT
492 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
493 printk("Support for ZFLAT executables is not enabled.\n");
500 * Check initial limits. This avoids letting people circumvent
501 * size limits imposed on them by creating programs with large
502 * arrays in the data or bss.
504 rlim = rlimit(RLIMIT_DATA);
505 if (rlim >= RLIM_INFINITY)
507 if (data_len + bss_len > rlim) {
512 /* Flush all traces of the currently running executable */
514 ret = flush_old_exec(bprm);
518 /* OK, This is the point of no return */
519 set_personality(PER_LINUX_32BIT);
520 setup_new_exec(bprm);
524 * calculate the extra space we need to map in
526 extra = max_t(unsigned long, bss_len + stack_len,
527 relocs * sizeof(unsigned long));
530 * there are a couple of cases here, the separate code/data
531 * case, and then the fully copied to RAM case which lumps
534 if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
536 * this should give us a ROM ptr, but if it doesn't we don't
539 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
541 textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
542 MAP_PRIVATE|MAP_EXECUTABLE, 0);
543 if (!textpos || IS_ERR_VALUE(textpos)) {
547 printk("Unable to mmap process text, errno %d\n", ret);
551 len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
552 len = PAGE_ALIGN(len);
553 realdatastart = vm_mmap(NULL, 0, len,
554 PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
556 if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
560 printk("Unable to allocate RAM for process data, "
562 vm_munmap(textpos, text_len);
565 datapos = ALIGN(realdatastart +
566 MAX_SHARED_LIBS * sizeof(unsigned long),
569 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%ld bytes): %lx\n",
570 data_len + bss_len + stack_len, datapos);
572 fpos = ntohl(hdr->data_start);
573 #ifdef CONFIG_BINFMT_ZFLAT
574 if (flags & FLAT_FLAG_GZDATA) {
575 result = decompress_exec(bprm, fpos, (char *)datapos,
580 result = read_code(bprm->file, datapos, fpos,
583 if (IS_ERR_VALUE(result)) {
585 printk("Unable to read data+bss, errno %d\n", ret);
586 vm_munmap(textpos, text_len);
587 vm_munmap(realdatastart, len);
591 reloc = (unsigned long *)
592 (datapos + (ntohl(hdr->reloc_start) - text_len));
593 memp = realdatastart;
597 len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
598 len = PAGE_ALIGN(len);
599 textpos = vm_mmap(NULL, 0, len,
600 PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
602 if (!textpos || IS_ERR_VALUE(textpos)) {
606 printk("Unable to allocate RAM for process text/data, "
611 realdatastart = textpos + ntohl(hdr->data_start);
612 datapos = ALIGN(realdatastart +
613 MAX_SHARED_LIBS * sizeof(unsigned long),
616 reloc = (unsigned long *)
617 (datapos + (ntohl(hdr->reloc_start) - text_len));
620 #ifdef CONFIG_BINFMT_ZFLAT
622 * load it all in and treat it like a RAM load from now on
624 if (flags & FLAT_FLAG_GZIP) {
625 result = decompress_exec(bprm, sizeof(struct flat_hdr),
626 (((char *)textpos) + sizeof(struct flat_hdr)),
627 (text_len + full_data
628 - sizeof(struct flat_hdr)),
630 memmove((void *) datapos, (void *) realdatastart,
632 } else if (flags & FLAT_FLAG_GZDATA) {
633 result = read_code(bprm->file, textpos, 0, text_len);
634 if (!IS_ERR_VALUE(result))
635 result = decompress_exec(bprm, text_len, (char *) datapos,
640 result = read_code(bprm->file, textpos, 0, text_len);
641 if (!IS_ERR_VALUE(result))
642 result = read_code(bprm->file, datapos,
643 ntohl(hdr->data_start),
646 if (IS_ERR_VALUE(result)) {
648 printk("Unable to read code+data+bss, errno %d\n", ret);
649 vm_munmap(textpos, text_len + data_len + extra +
650 MAX_SHARED_LIBS * sizeof(unsigned long));
655 start_code = textpos + sizeof(struct flat_hdr);
656 end_code = textpos + text_len;
657 text_len -= sizeof(struct flat_hdr); /* the real code len */
659 /* The main program needs a little extra setup in the task structure */
661 current->mm->start_code = start_code;
662 current->mm->end_code = end_code;
663 current->mm->start_data = datapos;
664 current->mm->end_data = datapos + data_len;
666 * set up the brk stuff, uses any slack left in data/bss/stack
667 * allocation. We put the brk after the bss (between the bss
668 * and stack) like other platforms.
669 * Userspace code relies on the stack pointer starting out at
670 * an address right at the end of a page.
672 current->mm->start_brk = datapos + data_len + bss_len;
673 current->mm->brk = (current->mm->start_brk + 3) & ~3;
674 current->mm->context.end_brk = memp + memp_size - stack_len;
677 if (flags & FLAT_FLAG_KTRACE) {
678 printk("Mapping is %lx, Entry point is %x, data_start is %x\n",
679 textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
680 printk("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
681 id ? "Lib" : "Load", bprm->filename,
682 start_code, end_code, datapos, datapos + data_len,
683 datapos + data_len, (datapos + data_len + bss_len + 3) & ~3);
686 /* Store the current module values into the global library structure */
687 libinfo->lib_list[id].start_code = start_code;
688 libinfo->lib_list[id].start_data = datapos;
689 libinfo->lib_list[id].start_brk = datapos + data_len + bss_len;
690 libinfo->lib_list[id].text_len = text_len;
691 libinfo->lib_list[id].loaded = 1;
692 libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
693 libinfo->lib_list[id].build_date = ntohl(hdr->build_date);
696 * We just load the allocations into some temporary memory to
697 * help simplify all this mumbo jumbo
699 * We've got two different sections of relocation entries.
700 * The first is the GOT which resides at the beginning of the data segment
701 * and is terminated with a -1. This one can be relocated in place.
702 * The second is the extra relocation entries tacked after the image's
703 * data segment. These require a little more processing as the entry is
704 * really an offset into the image which contains an offset into the
707 if (flags & FLAT_FLAG_GOTPIC) {
708 for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) {
711 addr = calc_reloc(*rp, libinfo, id, 0);
712 if (addr == RELOC_FAILED) {
722 * Now run through the relocation entries.
723 * We've got to be careful here as C++ produces relocatable zero
724 * entries in the constructor and destructor tables which are then
725 * tested for being not zero (which will always occur unless we're
726 * based from address zero). This causes an endless loop as __start
727 * is at zero. The solution used is to not relocate zero addresses.
728 * This has the negative side effect of not allowing a global data
729 * reference to be statically initialised to _stext (I've moved
730 * __start to address 4 so that is okay).
732 if (rev > OLD_FLAT_VERSION) {
733 unsigned long persistent = 0;
734 for (i = 0; i < relocs; i++) {
735 unsigned long addr, relval;
738 * Get the address of the pointer to be
739 * relocated (of course, the address has to be
742 relval = ntohl(reloc[i]);
743 if (flat_set_persistent(relval, &persistent))
745 addr = flat_get_relocate_addr(relval);
746 rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
747 if (rp == (unsigned long *)RELOC_FAILED) {
752 /* Get the pointer's value. */
753 addr = flat_get_addr_from_rp(rp, relval, flags,
757 * Do the relocation. PIC relocs in the data section are
758 * already in target order
760 if ((flags & FLAT_FLAG_GOTPIC) == 0)
762 addr = calc_reloc(addr, libinfo, id, 0);
763 if (addr == RELOC_FAILED) {
768 /* Write back the relocated pointer. */
769 flat_put_addr_at_rp(rp, addr, relval);
773 for (i = 0; i < relocs; i++)
774 old_reloc(ntohl(reloc[i]));
777 flush_icache_range(start_code, end_code);
779 /* zero the BSS, BRK and stack areas */
780 memset((void *)(datapos + data_len), 0, bss_len +
781 (memp + memp_size - stack_len - /* end brk */
782 libinfo->lib_list[id].start_brk) + /* start brk */
791 /****************************************************************************/
792 #ifdef CONFIG_BINFMT_SHARED_FLAT
795 * Load a shared library into memory. The library gets its own data
796 * segment (including bss) but not argv/argc/environ.
799 static int load_flat_shared_library(int id, struct lib_info *libs)
801 struct linux_binprm bprm;
805 memset(&bprm, 0, sizeof(bprm));
807 /* Create the file name */
808 sprintf(buf, "/lib/lib%d.so", id);
810 /* Open the file up */
812 bprm.file = open_exec(bprm.filename);
813 res = PTR_ERR(bprm.file);
814 if (IS_ERR(bprm.file))
817 bprm.cred = prepare_exec_creds();
822 /* We don't really care about recalculating credentials at this point
823 * as we're past the point of no return and are dealing with shared
826 bprm.cred_prepared = 1;
828 res = prepare_binprm(&bprm);
831 res = load_flat_file(&bprm, libs, id, NULL);
833 abort_creds(bprm.cred);
836 allow_write_access(bprm.file);
842 #endif /* CONFIG_BINFMT_SHARED_FLAT */
843 /****************************************************************************/
846 * These are the functions used to load flat style executables and shared
847 * libraries. There is no binary dependent code anywhere else.
850 static int load_flat_binary(struct linux_binprm *bprm)
852 struct lib_info libinfo;
853 struct pt_regs *regs = current_pt_regs();
854 unsigned long p = bprm->p;
855 unsigned long stack_len;
856 unsigned long start_addr;
861 memset(&libinfo, 0, sizeof(libinfo));
864 * We have to add the size of our arguments to our stack size
865 * otherwise it's too easy for users to create stack overflows
866 * by passing in a huge argument list. And yes, we have to be
867 * pedantic and include space for the argv/envp array as it may have
870 #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
871 stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
872 stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
873 stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
874 stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */
876 res = load_flat_file(bprm, &libinfo, 0, &stack_len);
880 /* Update data segment pointers for all libraries */
881 for (i = 0; i < MAX_SHARED_LIBS; i++)
882 if (libinfo.lib_list[i].loaded)
883 for (j = 0; j < MAX_SHARED_LIBS; j++)
884 (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] =
885 (libinfo.lib_list[j].loaded) ?
886 libinfo.lib_list[j].start_data : UNLOADED_LIB;
888 install_exec_creds(bprm);
890 set_binfmt(&flat_format);
892 p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
893 DBG_FLT("p=%lx\n", p);
895 /* copy the arg pages onto the stack, this could be more efficient :-) */
896 for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
898 ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
900 sp = (unsigned long *) create_flat_tables(p, bprm);
902 /* Fake some return addresses to ensure the call chain will
903 * initialise library in order for us. We are required to call
904 * lib 1 first, then 2, ... and finally the main program (id 0).
906 start_addr = libinfo.lib_list[0].entry;
908 #ifdef CONFIG_BINFMT_SHARED_FLAT
909 for (i = MAX_SHARED_LIBS-1; i > 0; i--) {
910 if (libinfo.lib_list[i].loaded) {
911 /* Push previos first to call address */
912 --sp; put_user(start_addr, sp);
913 start_addr = libinfo.lib_list[i].entry;
918 /* Stash our initial stack pointer into the mm structure */
919 current->mm->start_stack = (unsigned long)sp;
921 #ifdef FLAT_PLAT_INIT
922 FLAT_PLAT_INIT(regs);
925 DBG_FLT("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
926 regs, start_addr, current->mm->start_stack);
927 start_thread(regs, start_addr, current->mm->start_stack);
932 /****************************************************************************/
934 static int __init init_flat_binfmt(void)
936 register_binfmt(&flat_format);
939 core_initcall(init_flat_binfmt);
941 /****************************************************************************/