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/module.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
22 #include <linux/mman.h>
23 #include <linux/errno.h>
24 #include <linux/signal.h>
25 #include <linux/string.h>
27 #include <linux/file.h>
28 #include <linux/stat.h>
29 #include <linux/fcntl.h>
30 #include <linux/ptrace.h>
31 #include <linux/user.h>
32 #include <linux/slab.h>
33 #include <linux/binfmts.h>
34 #include <linux/personality.h>
35 #include <linux/init.h>
36 #include <linux/flat.h>
37 #include <linux/syscalls.h>
39 #include <asm/byteorder.h>
40 #include <asm/system.h>
41 #include <asm/uaccess.h>
42 #include <asm/unaligned.h>
43 #include <asm/cacheflush.h>
45 /****************************************************************************/
52 #define DBG_FLT(a...) printk(a)
57 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
58 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
62 unsigned long start_code
; /* Start of text segment */
63 unsigned long start_data
; /* Start of data segment */
64 unsigned long start_brk
; /* End of data segment */
65 unsigned long text_len
; /* Length of text segment */
66 unsigned long entry
; /* Start address for this module */
67 unsigned long build_date
; /* When this one was compiled */
68 short loaded
; /* Has this library been loaded? */
69 } lib_list
[MAX_SHARED_LIBS
];
72 #ifdef CONFIG_BINFMT_SHARED_FLAT
73 static int load_flat_shared_library(int id
, struct lib_info
*p
);
76 static int load_flat_binary(struct linux_binprm
*, struct pt_regs
* regs
);
77 static int flat_core_dump(long signr
, struct pt_regs
*regs
, struct file
*file
, unsigned long limit
);
79 static struct linux_binfmt flat_format
= {
80 .module
= THIS_MODULE
,
81 .load_binary
= load_flat_binary
,
82 .core_dump
= flat_core_dump
,
83 .min_coredump
= PAGE_SIZE
86 /****************************************************************************/
88 * Routine writes a core dump image in the current directory.
89 * Currently only a stub-function.
92 static int flat_core_dump(long signr
, struct pt_regs
*regs
, struct file
*file
, unsigned long limit
)
94 printk("Process %s:%d received signr %d and should have core dumped\n",
95 current
->comm
, current
->pid
, (int) signr
);
99 /****************************************************************************/
101 * create_flat_tables() parses the env- and arg-strings in new user
102 * memory and creates the pointer tables from them, and puts their
103 * addresses on the "stack", returning the new stack pointer value.
106 static unsigned long create_flat_tables(
108 struct linux_binprm
* bprm
)
110 unsigned long *argv
,*envp
;
112 char * p
= (char*)pp
;
113 int argc
= bprm
->argc
;
114 int envc
= bprm
->envc
;
115 char uninitialized_var(dummy
);
117 sp
= (unsigned long *) ((-(unsigned long)sizeof(char *))&(unsigned long) p
);
124 flat_stack_align(sp
);
125 if (flat_argvp_envp_on_stack()) {
126 --sp
; put_user((unsigned long) envp
, sp
);
127 --sp
; put_user((unsigned long) argv
, sp
);
131 current
->mm
->arg_start
= (unsigned long) p
;
133 put_user((unsigned long) p
, argv
++);
135 get_user(dummy
, p
); p
++;
138 put_user((unsigned long) NULL
, argv
);
139 current
->mm
->arg_end
= current
->mm
->env_start
= (unsigned long) p
;
141 put_user((unsigned long)p
, envp
); envp
++;
143 get_user(dummy
, p
); p
++;
146 put_user((unsigned long) NULL
, envp
);
147 current
->mm
->env_end
= (unsigned long) p
;
148 return (unsigned long)sp
;
151 /****************************************************************************/
153 #ifdef CONFIG_BINFMT_ZFLAT
155 #include <linux/zlib.h>
157 #define LBUFSIZE 4000
160 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
161 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
162 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
163 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
164 #define COMMENT 0x10 /* bit 4 set: file comment present */
165 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
166 #define RESERVED 0xC0 /* bit 6,7: reserved */
168 static int decompress_exec(
169 struct linux_binprm
*bprm
,
170 unsigned long offset
,
180 DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset
, (int)dst
, (int)len
);
182 memset(&strm
, 0, sizeof(strm
));
183 strm
.workspace
= kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL
);
184 if (strm
.workspace
== NULL
) {
185 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
188 buf
= kmalloc(LBUFSIZE
, GFP_KERNEL
);
190 DBG_FLT("binfmt_flat: no memory for read buffer\n");
195 /* Read in first chunk of data and parse gzip header. */
197 ret
= bprm
->file
->f_op
->read(bprm
->file
, buf
, LBUFSIZE
, &fpos
);
205 /* Check minimum size -- gzip header */
207 DBG_FLT("binfmt_flat: file too small?\n");
211 /* Check gzip magic number */
212 if ((buf
[0] != 037) || ((buf
[1] != 0213) && (buf
[1] != 0236))) {
213 DBG_FLT("binfmt_flat: unknown compression magic?\n");
217 /* Check gzip method */
219 DBG_FLT("binfmt_flat: unknown compression method?\n");
222 /* Check gzip flags */
223 if ((buf
[3] & ENCRYPTED
) || (buf
[3] & CONTINUATION
) ||
224 (buf
[3] & RESERVED
)) {
225 DBG_FLT("binfmt_flat: unknown flags?\n");
230 if (buf
[3] & EXTRA_FIELD
) {
231 ret
+= 2 + buf
[10] + (buf
[11] << 8);
232 if (unlikely(LBUFSIZE
== ret
)) {
233 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
237 if (buf
[3] & ORIG_NAME
) {
238 for (; ret
< LBUFSIZE
&& (buf
[ret
] != 0); ret
++)
240 if (unlikely(LBUFSIZE
== ret
)) {
241 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
245 if (buf
[3] & COMMENT
) {
246 for (; ret
< LBUFSIZE
&& (buf
[ret
] != 0); ret
++)
248 if (unlikely(LBUFSIZE
== ret
)) {
249 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
255 strm
.avail_in
-= ret
;
258 strm
.avail_out
= len
;
261 if (zlib_inflateInit2(&strm
, -MAX_WBITS
) != Z_OK
) {
262 DBG_FLT("binfmt_flat: zlib init failed?\n");
266 while ((ret
= zlib_inflate(&strm
, Z_NO_FLUSH
)) == Z_OK
) {
267 ret
= bprm
->file
->f_op
->read(bprm
->file
, buf
, LBUFSIZE
, &fpos
);
270 if (ret
>= (unsigned long) -4096)
280 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
287 zlib_inflateEnd(&strm
);
291 kfree(strm
.workspace
);
295 #endif /* CONFIG_BINFMT_ZFLAT */
297 /****************************************************************************/
300 calc_reloc(unsigned long r
, struct lib_info
*p
, int curid
, int internalp
)
304 unsigned long start_brk
;
305 unsigned long start_data
;
306 unsigned long text_len
;
307 unsigned long start_code
;
309 #ifdef CONFIG_BINFMT_SHARED_FLAT
311 id
= curid
; /* Relocs of 0 are always self referring */
313 id
= (r
>> 24) & 0xff; /* Find ID for this reloc */
314 r
&= 0x00ffffff; /* Trim ID off here */
316 if (id
>= MAX_SHARED_LIBS
) {
317 printk("BINFMT_FLAT: reference 0x%x to shared library %d",
323 printk("BINFMT_FLAT: reloc address 0x%x not in same module "
324 "(%d != %d)", (unsigned) r
, curid
, id
);
326 } else if ( ! p
->lib_list
[id
].loaded
&&
327 load_flat_shared_library(id
, p
) > (unsigned long) -4096) {
328 printk("BINFMT_FLAT: 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 printk("BINFMT_FLAT: 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 printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)",
349 (int) r
,(int)(start_brk
-start_code
),(int)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 printk(", killing %s!\n", current
->comm
);
363 send_sig(SIGSEGV
, current
, 0);
368 /****************************************************************************/
370 void old_reloc(unsigned long rl
)
373 char *segment
[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
379 #if defined(CONFIG_COLDFIRE)
380 ptr
= (unsigned long *) (current
->mm
->start_code
+ r
.reloc
.offset
);
382 ptr
= (unsigned long *) (current
->mm
->start_data
+ r
.reloc
.offset
);
386 printk("Relocation of variable at DATASEG+%x "
387 "(address %p, currently %x) into segment %s\n",
388 r
.reloc
.offset
, ptr
, (int)*ptr
, segment
[r
.reloc
.type
]);
391 switch (r
.reloc
.type
) {
392 case OLD_FLAT_RELOC_TYPE_TEXT
:
393 *ptr
+= current
->mm
->start_code
;
395 case OLD_FLAT_RELOC_TYPE_DATA
:
396 *ptr
+= current
->mm
->start_data
;
398 case OLD_FLAT_RELOC_TYPE_BSS
:
399 *ptr
+= current
->mm
->end_data
;
402 printk("BINFMT_FLAT: Unknown relocation type=%x\n", r
.reloc
.type
);
407 printk("Relocation became %x\n", (int)*ptr
);
411 /****************************************************************************/
413 static int load_flat_file(struct linux_binprm
* bprm
,
414 struct lib_info
*libinfo
, int id
, unsigned long *extra_stack
)
416 struct flat_hdr
* hdr
;
417 unsigned long textpos
= 0, datapos
= 0, result
;
418 unsigned long realdatastart
= 0;
419 unsigned long text_len
, data_len
, bss_len
, stack_len
, flags
;
420 unsigned long len
, reallen
, memp
= 0;
421 unsigned long extra
, rlim
;
422 unsigned long *reloc
= 0, *rp
;
424 int i
, rev
, relocs
= 0;
426 unsigned long start_code
, end_code
;
429 hdr
= ((struct flat_hdr
*) bprm
->buf
); /* exec-header */
430 inode
= bprm
->file
->f_path
.dentry
->d_inode
;
432 text_len
= ntohl(hdr
->data_start
);
433 data_len
= ntohl(hdr
->data_end
) - ntohl(hdr
->data_start
);
434 bss_len
= ntohl(hdr
->bss_end
) - ntohl(hdr
->data_end
);
435 stack_len
= ntohl(hdr
->stack_size
);
437 stack_len
+= *extra_stack
;
438 *extra_stack
= stack_len
;
440 relocs
= ntohl(hdr
->reloc_count
);
441 flags
= ntohl(hdr
->flags
);
442 rev
= ntohl(hdr
->rev
);
444 if (strncmp(hdr
->magic
, "bFLT", 4)) {
446 * Previously, here was a printk to tell people
447 * "BINFMT_FLAT: bad header magic".
448 * But for the kernel which also use ELF FD-PIC format, this
449 * error message is confusing.
450 * because a lot of people do not manage to produce good
456 if (flags
& FLAT_FLAG_KTRACE
)
457 printk("BINFMT_FLAT: Loading file: %s\n", bprm
->filename
);
459 if (rev
!= FLAT_VERSION
&& rev
!= OLD_FLAT_VERSION
) {
460 printk("BINFMT_FLAT: bad flat file version 0x%x (supported "
461 "0x%lx and 0x%lx)\n",
462 rev
, FLAT_VERSION
, OLD_FLAT_VERSION
);
467 /* Don't allow old format executables to use shared libraries */
468 if (rev
== OLD_FLAT_VERSION
&& id
!= 0) {
469 printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n",
476 * fix up the flags for the older format, there were all kinds
477 * of endian hacks, this only works for the simple cases
479 if (rev
== OLD_FLAT_VERSION
&& flat_old_ram_flag(flags
))
480 flags
= FLAT_FLAG_RAM
;
482 #ifndef CONFIG_BINFMT_ZFLAT
483 if (flags
& (FLAT_FLAG_GZIP
|FLAT_FLAG_GZDATA
)) {
484 printk("Support for ZFLAT executables is not enabled.\n");
491 * Check initial limits. This avoids letting people circumvent
492 * size limits imposed on them by creating programs with large
493 * arrays in the data or bss.
495 rlim
= current
->signal
->rlim
[RLIMIT_DATA
].rlim_cur
;
496 if (rlim
>= RLIM_INFINITY
)
498 if (data_len
+ bss_len
> rlim
) {
503 /* Flush all traces of the currently running executable */
505 result
= flush_old_exec(bprm
);
511 /* OK, This is the point of no return */
512 set_personality(PER_LINUX_32BIT
);
516 * calculate the extra space we need to map in
518 extra
= max_t(unsigned long, bss_len
+ stack_len
,
519 relocs
* sizeof(unsigned long));
522 * there are a couple of cases here, the separate code/data
523 * case, and then the fully copied to RAM case which lumps
526 if ((flags
& (FLAT_FLAG_RAM
|FLAT_FLAG_GZIP
)) == 0) {
528 * this should give us a ROM ptr, but if it doesn't we don't
531 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
533 down_write(¤t
->mm
->mmap_sem
);
534 textpos
= do_mmap(bprm
->file
, 0, text_len
, PROT_READ
|PROT_EXEC
,
535 MAP_PRIVATE
|MAP_EXECUTABLE
, 0);
536 up_write(¤t
->mm
->mmap_sem
);
537 if (!textpos
|| textpos
>= (unsigned long) -4096) {
539 textpos
= (unsigned long) -ENOMEM
;
540 printk("Unable to mmap process text, errno %d\n", (int)-textpos
);
545 len
= data_len
+ extra
+ MAX_SHARED_LIBS
* sizeof(unsigned long);
546 down_write(¤t
->mm
->mmap_sem
);
547 realdatastart
= do_mmap(0, 0, len
,
548 PROT_READ
|PROT_WRITE
|PROT_EXEC
, MAP_PRIVATE
, 0);
549 /* Remap to use all availabe slack region space */
550 if (realdatastart
&& (realdatastart
< (unsigned long)-4096)) {
551 reallen
= kobjsize((void *)realdatastart
);
553 realdatastart
= do_mremap(realdatastart
, len
,
554 reallen
, MREMAP_FIXED
, realdatastart
);
557 up_write(¤t
->mm
->mmap_sem
);
559 if (realdatastart
== 0 || realdatastart
>= (unsigned long)-4096) {
561 realdatastart
= (unsigned long) -ENOMEM
;
562 printk("Unable to allocate RAM for process data, errno %d\n",
563 (int)-realdatastart
);
564 do_munmap(current
->mm
, textpos
, text_len
);
568 datapos
= realdatastart
+ MAX_SHARED_LIBS
* sizeof(unsigned long);
570 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
571 (int)(data_len
+ bss_len
+ stack_len
), (int)datapos
);
573 fpos
= ntohl(hdr
->data_start
);
574 #ifdef CONFIG_BINFMT_ZFLAT
575 if (flags
& FLAT_FLAG_GZDATA
) {
576 result
= decompress_exec(bprm
, fpos
, (char *) datapos
,
577 data_len
+ (relocs
* sizeof(unsigned long)), 0);
581 result
= bprm
->file
->f_op
->read(bprm
->file
, (char *) datapos
,
582 data_len
+ (relocs
* sizeof(unsigned long)), &fpos
);
584 if (result
>= (unsigned long)-4096) {
585 printk("Unable to read data+bss, errno %d\n", (int)-result
);
586 do_munmap(current
->mm
, textpos
, text_len
);
587 do_munmap(current
->mm
, realdatastart
, data_len
+ extra
);
592 reloc
= (unsigned long *) (datapos
+(ntohl(hdr
->reloc_start
)-text_len
));
593 memp
= realdatastart
;
597 len
= text_len
+ data_len
+ extra
+ MAX_SHARED_LIBS
* sizeof(unsigned long);
598 down_write(¤t
->mm
->mmap_sem
);
599 textpos
= do_mmap(0, 0, len
,
600 PROT_READ
| PROT_EXEC
| PROT_WRITE
, MAP_PRIVATE
, 0);
601 /* Remap to use all availabe slack region space */
602 if (textpos
&& (textpos
< (unsigned long) -4096)) {
603 reallen
= kobjsize((void *)textpos
);
605 textpos
= do_mremap(textpos
, len
, reallen
,
606 MREMAP_FIXED
, textpos
);
609 up_write(¤t
->mm
->mmap_sem
);
611 if (!textpos
|| textpos
>= (unsigned long) -4096) {
613 textpos
= (unsigned long) -ENOMEM
;
614 printk("Unable to allocate RAM for process text/data, errno %d\n",
620 realdatastart
= textpos
+ ntohl(hdr
->data_start
);
621 datapos
= realdatastart
+ MAX_SHARED_LIBS
* sizeof(unsigned long);
622 reloc
= (unsigned long *) (textpos
+ ntohl(hdr
->reloc_start
) +
623 MAX_SHARED_LIBS
* sizeof(unsigned long));
626 #ifdef CONFIG_BINFMT_ZFLAT
628 * load it all in and treat it like a RAM load from now on
630 if (flags
& FLAT_FLAG_GZIP
) {
631 result
= decompress_exec(bprm
, sizeof (struct flat_hdr
),
632 (((char *) textpos
) + sizeof (struct flat_hdr
)),
633 (text_len
+ data_len
+ (relocs
* sizeof(unsigned long))
634 - sizeof (struct flat_hdr
)),
636 memmove((void *) datapos
, (void *) realdatastart
,
637 data_len
+ (relocs
* sizeof(unsigned long)));
638 } else if (flags
& FLAT_FLAG_GZDATA
) {
640 result
= bprm
->file
->f_op
->read(bprm
->file
,
641 (char *) textpos
, text_len
, &fpos
);
642 if (result
< (unsigned long) -4096)
643 result
= decompress_exec(bprm
, text_len
, (char *) datapos
,
644 data_len
+ (relocs
* sizeof(unsigned long)), 0);
650 result
= bprm
->file
->f_op
->read(bprm
->file
,
651 (char *) textpos
, text_len
, &fpos
);
652 if (result
< (unsigned long) -4096) {
653 fpos
= ntohl(hdr
->data_start
);
654 result
= bprm
->file
->f_op
->read(bprm
->file
, (char *) datapos
,
655 data_len
+ (relocs
* sizeof(unsigned long)), &fpos
);
658 if (result
>= (unsigned long)-4096) {
659 printk("Unable to read code+data+bss, errno %d\n",(int)-result
);
660 do_munmap(current
->mm
, textpos
, text_len
+ data_len
+ extra
+
661 MAX_SHARED_LIBS
* sizeof(unsigned long));
667 if (flags
& FLAT_FLAG_KTRACE
)
668 printk("Mapping is %x, Entry point is %x, data_start is %x\n",
669 (int)textpos
, 0x00ffffff&ntohl(hdr
->entry
), ntohl(hdr
->data_start
));
671 /* The main program needs a little extra setup in the task structure */
672 start_code
= textpos
+ sizeof (struct flat_hdr
);
673 end_code
= textpos
+ text_len
;
675 current
->mm
->start_code
= start_code
;
676 current
->mm
->end_code
= end_code
;
677 current
->mm
->start_data
= datapos
;
678 current
->mm
->end_data
= datapos
+ data_len
;
680 * set up the brk stuff, uses any slack left in data/bss/stack
681 * allocation. We put the brk after the bss (between the bss
682 * and stack) like other platforms.
684 current
->mm
->start_brk
= datapos
+ data_len
+ bss_len
;
685 current
->mm
->brk
= (current
->mm
->start_brk
+ 3) & ~3;
686 current
->mm
->context
.end_brk
= memp
+ kobjsize((void *) memp
) - stack_len
;
689 if (flags
& FLAT_FLAG_KTRACE
)
690 printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
691 id
? "Lib" : "Load", bprm
->filename
,
692 (int) start_code
, (int) end_code
,
694 (int) (datapos
+ data_len
),
695 (int) (datapos
+ data_len
),
696 (int) (((datapos
+ data_len
+ bss_len
) + 3) & ~3));
698 text_len
-= sizeof(struct flat_hdr
); /* the real code len */
700 /* Store the current module values into the global library structure */
701 libinfo
->lib_list
[id
].start_code
= start_code
;
702 libinfo
->lib_list
[id
].start_data
= datapos
;
703 libinfo
->lib_list
[id
].start_brk
= datapos
+ data_len
+ bss_len
;
704 libinfo
->lib_list
[id
].text_len
= text_len
;
705 libinfo
->lib_list
[id
].loaded
= 1;
706 libinfo
->lib_list
[id
].entry
= (0x00ffffff & ntohl(hdr
->entry
)) + textpos
;
707 libinfo
->lib_list
[id
].build_date
= ntohl(hdr
->build_date
);
710 * We just load the allocations into some temporary memory to
711 * help simplify all this mumbo jumbo
713 * We've got two different sections of relocation entries.
714 * The first is the GOT which resides at the begining of the data segment
715 * and is terminated with a -1. This one can be relocated in place.
716 * The second is the extra relocation entries tacked after the image's
717 * data segment. These require a little more processing as the entry is
718 * really an offset into the image which contains an offset into the
721 if (flags
& FLAT_FLAG_GOTPIC
) {
722 for (rp
= (unsigned long *)datapos
; *rp
!= 0xffffffff; rp
++) {
725 addr
= calc_reloc(*rp
, libinfo
, id
, 0);
726 if (addr
== RELOC_FAILED
) {
736 * Now run through the relocation entries.
737 * We've got to be careful here as C++ produces relocatable zero
738 * entries in the constructor and destructor tables which are then
739 * tested for being not zero (which will always occur unless we're
740 * based from address zero). This causes an endless loop as __start
741 * is at zero. The solution used is to not relocate zero addresses.
742 * This has the negative side effect of not allowing a global data
743 * reference to be statically initialised to _stext (I've moved
744 * __start to address 4 so that is okay).
746 if (rev
> OLD_FLAT_VERSION
) {
747 unsigned long persistent
= 0;
748 for (i
=0; i
< relocs
; i
++) {
749 unsigned long addr
, relval
;
751 /* Get the address of the pointer to be
752 relocated (of course, the address has to be
754 relval
= ntohl(reloc
[i
]);
755 if (flat_set_persistent (relval
, &persistent
))
757 addr
= flat_get_relocate_addr(relval
);
758 rp
= (unsigned long *) calc_reloc(addr
, libinfo
, id
, 1);
759 if (rp
== (unsigned long *)RELOC_FAILED
) {
764 /* Get the pointer's value. */
765 addr
= flat_get_addr_from_rp(rp
, relval
, flags
,
769 * Do the relocation. PIC relocs in the data section are
770 * already in target order
772 if ((flags
& FLAT_FLAG_GOTPIC
) == 0)
774 addr
= calc_reloc(addr
, libinfo
, id
, 0);
775 if (addr
== RELOC_FAILED
) {
780 /* Write back the relocated pointer. */
781 flat_put_addr_at_rp(rp
, addr
, relval
);
785 for (i
=0; i
< relocs
; i
++)
786 old_reloc(ntohl(reloc
[i
]));
789 flush_icache_range(start_code
, end_code
);
791 /* zero the BSS, BRK and stack areas */
792 memset((void*)(datapos
+ data_len
), 0, bss_len
+
793 (memp
+ kobjsize((void *) memp
) - stack_len
- /* end brk */
794 libinfo
->lib_list
[id
].start_brk
) + /* start brk */
803 /****************************************************************************/
804 #ifdef CONFIG_BINFMT_SHARED_FLAT
807 * Load a shared library into memory. The library gets its own data
808 * segment (including bss) but not argv/argc/environ.
811 static int load_flat_shared_library(int id
, struct lib_info
*libs
)
813 struct linux_binprm bprm
;
817 /* Create the file name */
818 sprintf(buf
, "/lib/lib%d.so", id
);
820 /* Open the file up */
822 bprm
.file
= open_exec(bprm
.filename
);
823 res
= PTR_ERR(bprm
.file
);
824 if (IS_ERR(bprm
.file
))
827 res
= prepare_binprm(&bprm
);
829 if (res
<= (unsigned long)-4096)
830 res
= load_flat_file(&bprm
, libs
, id
, NULL
);
832 allow_write_access(bprm
.file
);
839 #endif /* CONFIG_BINFMT_SHARED_FLAT */
840 /****************************************************************************/
843 * These are the functions used to load flat style executables and shared
844 * libraries. There is no binary dependent code anywhere else.
847 static int load_flat_binary(struct linux_binprm
* bprm
, struct pt_regs
* regs
)
849 struct lib_info libinfo
;
850 unsigned long p
= bprm
->p
;
851 unsigned long stack_len
;
852 unsigned long start_addr
;
857 memset(&libinfo
, 0, sizeof(libinfo
));
859 * We have to add the size of our arguments to our stack size
860 * otherwise it's too easy for users to create stack overflows
861 * by passing in a huge argument list. And yes, we have to be
862 * pedantic and include space for the argv/envp array as it may have
865 #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
866 stack_len
= TOP_OF_ARGS
- bprm
->p
; /* the strings */
867 stack_len
+= (bprm
->argc
+ 1) * sizeof(char *); /* the argv array */
868 stack_len
+= (bprm
->envc
+ 1) * sizeof(char *); /* the envp array */
871 res
= load_flat_file(bprm
, &libinfo
, 0, &stack_len
);
872 if (res
> (unsigned long)-4096)
875 /* Update data segment pointers for all libraries */
876 for (i
=0; i
<MAX_SHARED_LIBS
; i
++)
877 if (libinfo
.lib_list
[i
].loaded
)
878 for (j
=0; j
<MAX_SHARED_LIBS
; j
++)
879 (-(j
+1))[(unsigned long *)(libinfo
.lib_list
[i
].start_data
)] =
880 (libinfo
.lib_list
[j
].loaded
)?
881 libinfo
.lib_list
[j
].start_data
:UNLOADED_LIB
;
884 current
->flags
&= ~PF_FORKNOEXEC
;
886 set_binfmt(&flat_format
);
888 p
= ((current
->mm
->context
.end_brk
+ stack_len
+ 3) & ~3) - 4;
889 DBG_FLT("p=%x\n", (int)p
);
891 /* copy the arg pages onto the stack, this could be more efficient :-) */
892 for (i
= TOP_OF_ARGS
- 1; i
>= bprm
->p
; i
--)
894 ((char *) page_address(bprm
->page
[i
/PAGE_SIZE
]))[i
% PAGE_SIZE
];
896 sp
= (unsigned long *) create_flat_tables(p
, bprm
);
898 /* Fake some return addresses to ensure the call chain will
899 * initialise library in order for us. We are required to call
900 * lib 1 first, then 2, ... and finally the main program (id 0).
902 start_addr
= libinfo
.lib_list
[0].entry
;
904 #ifdef CONFIG_BINFMT_SHARED_FLAT
905 for (i
= MAX_SHARED_LIBS
-1; i
>0; i
--) {
906 if (libinfo
.lib_list
[i
].loaded
) {
907 /* Push previos first to call address */
908 --sp
; put_user(start_addr
, sp
);
909 start_addr
= libinfo
.lib_list
[i
].entry
;
914 /* Stash our initial stack pointer into the mm structure */
915 current
->mm
->start_stack
= (unsigned long )sp
;
918 DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n",
919 (int)regs
, (int)start_addr
, (int)current
->mm
->start_stack
);
921 start_thread(regs
, start_addr
, current
->mm
->start_stack
);
923 if (current
->ptrace
& PT_PTRACED
)
924 send_sig(SIGTRAP
, current
, 0);
929 /****************************************************************************/
931 static int __init
init_flat_binfmt(void)
933 return register_binfmt(&flat_format
);
936 /****************************************************************************/
938 core_initcall(init_flat_binfmt
);
940 /****************************************************************************/
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