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/a.out.h>
24 #include <linux/errno.h>
25 #include <linux/signal.h>
26 #include <linux/string.h>
28 #include <linux/file.h>
29 #include <linux/stat.h>
30 #include <linux/fcntl.h>
31 #include <linux/ptrace.h>
32 #include <linux/user.h>
33 #include <linux/slab.h>
34 #include <linux/binfmts.h>
35 #include <linux/personality.h>
36 #include <linux/init.h>
37 #include <linux/flat.h>
38 #include <linux/syscalls.h>
40 #include <asm/byteorder.h>
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
43 #include <asm/unaligned.h>
44 #include <asm/cacheflush.h>
46 /****************************************************************************/
53 #define DBG_FLT(a...) printk(a)
58 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
59 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
63 unsigned long start_code
; /* Start of text segment */
64 unsigned long start_data
; /* Start of data segment */
65 unsigned long start_brk
; /* End of data segment */
66 unsigned long text_len
; /* Length of text segment */
67 unsigned long entry
; /* Start address for this module */
68 unsigned long build_date
; /* When this one was compiled */
69 short loaded
; /* Has this library been loaded? */
70 } lib_list
[MAX_SHARED_LIBS
];
73 #ifdef CONFIG_BINFMT_SHARED_FLAT
74 static int load_flat_shared_library(int id
, struct lib_info
*p
);
77 static int load_flat_binary(struct linux_binprm
*, struct pt_regs
* regs
);
78 static int flat_core_dump(long signr
, struct pt_regs
* regs
, struct file
*file
);
80 static struct linux_binfmt flat_format
= {
81 .module
= THIS_MODULE
,
82 .load_binary
= load_flat_binary
,
83 .core_dump
= flat_core_dump
,
84 .min_coredump
= PAGE_SIZE
87 /****************************************************************************/
89 * Routine writes a core dump image in the current directory.
90 * Currently only a stub-function.
93 static int flat_core_dump(long signr
, struct pt_regs
* regs
, struct file
*file
)
95 printk("Process %s:%d received signr %d and should have core dumped\n",
96 current
->comm
, current
->pid
, (int) signr
);
100 /****************************************************************************/
102 * create_flat_tables() parses the env- and arg-strings in new user
103 * memory and creates the pointer tables from them, and puts their
104 * addresses on the "stack", returning the new stack pointer value.
107 static unsigned long create_flat_tables(
109 struct linux_binprm
* bprm
)
111 unsigned long *argv
,*envp
;
113 char * p
= (char*)pp
;
114 int argc
= bprm
->argc
;
115 int envc
= bprm
->envc
;
118 sp
= (unsigned long *) ((-(unsigned long)sizeof(char *))&(unsigned long) p
);
125 flat_stack_align(sp
);
126 if (flat_argvp_envp_on_stack()) {
127 --sp
; put_user((unsigned long) envp
, sp
);
128 --sp
; put_user((unsigned long) argv
, sp
);
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 DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset
, (int)dst
, (int)len
);
183 memset(&strm
, 0, sizeof(strm
));
184 strm
.workspace
= kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL
);
185 if (strm
.workspace
== NULL
) {
186 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
189 buf
= kmalloc(LBUFSIZE
, GFP_KERNEL
);
191 DBG_FLT("binfmt_flat: no memory for read buffer\n");
196 /* Read in first chunk of data and parse gzip header. */
198 ret
= bprm
->file
->f_op
->read(bprm
->file
, buf
, LBUFSIZE
, &fpos
);
206 /* Check minimum size -- gzip header */
208 DBG_FLT("binfmt_flat: file too small?\n");
212 /* Check gzip magic number */
213 if ((buf
[0] != 037) || ((buf
[1] != 0213) && (buf
[1] != 0236))) {
214 DBG_FLT("binfmt_flat: unknown compression magic?\n");
218 /* Check gzip method */
220 DBG_FLT("binfmt_flat: unknown compression method?\n");
223 /* Check gzip flags */
224 if ((buf
[3] & ENCRYPTED
) || (buf
[3] & CONTINUATION
) ||
225 (buf
[3] & RESERVED
)) {
226 DBG_FLT("binfmt_flat: unknown flags?\n");
231 if (buf
[3] & EXTRA_FIELD
) {
232 ret
+= 2 + buf
[10] + (buf
[11] << 8);
233 if (unlikely(LBUFSIZE
== ret
)) {
234 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
238 if (buf
[3] & ORIG_NAME
) {
239 for (; ret
< LBUFSIZE
&& (buf
[ret
] != 0); ret
++)
241 if (unlikely(LBUFSIZE
== ret
)) {
242 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
246 if (buf
[3] & COMMENT
) {
247 for (; ret
< LBUFSIZE
&& (buf
[ret
] != 0); ret
++)
249 if (unlikely(LBUFSIZE
== ret
)) {
250 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
256 strm
.avail_in
-= ret
;
259 strm
.avail_out
= len
;
262 if (zlib_inflateInit2(&strm
, -MAX_WBITS
) != Z_OK
) {
263 DBG_FLT("binfmt_flat: zlib init failed?\n");
267 while ((ret
= zlib_inflate(&strm
, Z_NO_FLUSH
)) == Z_OK
) {
268 ret
= bprm
->file
->f_op
->read(bprm
->file
, buf
, LBUFSIZE
, &fpos
);
271 if (ret
>= (unsigned long) -4096)
281 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
288 zlib_inflateEnd(&strm
);
292 kfree(strm
.workspace
);
297 #endif /* CONFIG_BINFMT_ZFLAT */
299 /****************************************************************************/
302 calc_reloc(unsigned long r
, struct lib_info
*p
, int curid
, int internalp
)
306 unsigned long start_brk
;
307 unsigned long start_data
;
308 unsigned long text_len
;
309 unsigned long start_code
;
311 #ifdef CONFIG_BINFMT_SHARED_FLAT
313 id
= curid
; /* Relocs of 0 are always self referring */
315 id
= (r
>> 24) & 0xff; /* Find ID for this reloc */
316 r
&= 0x00ffffff; /* Trim ID off here */
318 if (id
>= MAX_SHARED_LIBS
) {
319 printk("BINFMT_FLAT: reference 0x%x to shared library %d",
325 printk("BINFMT_FLAT: reloc address 0x%x not in same module "
326 "(%d != %d)", (unsigned) r
, curid
, id
);
328 } else if ( ! p
->lib_list
[id
].loaded
&&
329 load_flat_shared_library(id
, p
) > (unsigned long) -4096) {
330 printk("BINFMT_FLAT: failed to load library %d", id
);
333 /* Check versioning information (i.e. time stamps) */
334 if (p
->lib_list
[id
].build_date
&& p
->lib_list
[curid
].build_date
&&
335 p
->lib_list
[curid
].build_date
< p
->lib_list
[id
].build_date
) {
336 printk("BINFMT_FLAT: library %d is younger than %d", id
, curid
);
344 start_brk
= p
->lib_list
[id
].start_brk
;
345 start_data
= p
->lib_list
[id
].start_data
;
346 start_code
= p
->lib_list
[id
].start_code
;
347 text_len
= p
->lib_list
[id
].text_len
;
349 if (!flat_reloc_valid(r
, start_brk
- start_data
+ text_len
)) {
350 printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)",
351 (int) r
,(int)(start_brk
-start_code
),(int)text_len
);
355 if (r
< text_len
) /* In text segment */
356 addr
= r
+ start_code
;
357 else /* In data segment */
358 addr
= r
- text_len
+ start_data
;
360 /* Range checked already above so doing the range tests is redundant...*/
364 printk(", killing %s!\n", current
->comm
);
365 send_sig(SIGSEGV
, current
, 0);
370 /****************************************************************************/
372 void old_reloc(unsigned long rl
)
375 char *segment
[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
381 #if defined(CONFIG_COLDFIRE)
382 ptr
= (unsigned long *) (current
->mm
->start_code
+ r
.reloc
.offset
);
384 ptr
= (unsigned long *) (current
->mm
->start_data
+ r
.reloc
.offset
);
388 printk("Relocation of variable at DATASEG+%x "
389 "(address %p, currently %x) into segment %s\n",
390 r
.reloc
.offset
, ptr
, (int)*ptr
, segment
[r
.reloc
.type
]);
393 switch (r
.reloc
.type
) {
394 case OLD_FLAT_RELOC_TYPE_TEXT
:
395 *ptr
+= current
->mm
->start_code
;
397 case OLD_FLAT_RELOC_TYPE_DATA
:
398 *ptr
+= current
->mm
->start_data
;
400 case OLD_FLAT_RELOC_TYPE_BSS
:
401 *ptr
+= current
->mm
->end_data
;
404 printk("BINFMT_FLAT: Unknown relocation type=%x\n", r
.reloc
.type
);
409 printk("Relocation became %x\n", (int)*ptr
);
413 /****************************************************************************/
415 static int load_flat_file(struct linux_binprm
* bprm
,
416 struct lib_info
*libinfo
, int id
, unsigned long *extra_stack
)
418 struct flat_hdr
* hdr
;
419 unsigned long textpos
= 0, datapos
= 0, result
;
420 unsigned long realdatastart
= 0;
421 unsigned long text_len
, data_len
, bss_len
, stack_len
, flags
;
422 unsigned long memp
= 0; /* for finding the brk area */
423 unsigned long extra
, rlim
;
424 unsigned long *reloc
= 0, *rp
;
426 int i
, rev
, relocs
= 0;
428 unsigned long start_code
, end_code
;
431 hdr
= ((struct flat_hdr
*) bprm
->buf
); /* exec-header */
432 inode
= bprm
->file
->f_dentry
->d_inode
;
434 text_len
= ntohl(hdr
->data_start
);
435 data_len
= ntohl(hdr
->data_end
) - ntohl(hdr
->data_start
);
436 bss_len
= ntohl(hdr
->bss_end
) - ntohl(hdr
->data_end
);
437 stack_len
= ntohl(hdr
->stack_size
);
439 stack_len
+= *extra_stack
;
440 *extra_stack
= stack_len
;
442 relocs
= ntohl(hdr
->reloc_count
);
443 flags
= ntohl(hdr
->flags
);
444 rev
= ntohl(hdr
->rev
);
446 if (strncmp(hdr
->magic
, "bFLT", 4)) {
448 * because a lot of people do not manage to produce good
449 * flat binaries, we leave this printk to help them realise
450 * the problem. We only print the error if its not a script file
452 if (strncmp(hdr
->magic
, "#!", 2))
453 printk("BINFMT_FLAT: bad header magic\n");
458 if (flags
& FLAT_FLAG_KTRACE
)
459 printk("BINFMT_FLAT: Loading file: %s\n", bprm
->filename
);
461 if (rev
!= FLAT_VERSION
&& rev
!= OLD_FLAT_VERSION
) {
462 printk("BINFMT_FLAT: bad flat file version 0x%x (supported 0x%x and 0x%x)\n", 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(bss_len
+ stack_len
, relocs
* sizeof(unsigned long));
521 * there are a couple of cases here, the separate code/data
522 * case, and then the fully copied to RAM case which lumps
525 if ((flags
& (FLAT_FLAG_RAM
|FLAT_FLAG_GZIP
)) == 0) {
527 * this should give us a ROM ptr, but if it doesn't we don't
530 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
532 down_write(¤t
->mm
->mmap_sem
);
533 textpos
= do_mmap(bprm
->file
, 0, text_len
, PROT_READ
|PROT_EXEC
, MAP_PRIVATE
, 0);
534 up_write(¤t
->mm
->mmap_sem
);
535 if (!textpos
|| textpos
>= (unsigned long) -4096) {
537 textpos
= (unsigned long) -ENOMEM
;
538 printk("Unable to mmap process text, errno %d\n", (int)-textpos
);
543 down_write(¤t
->mm
->mmap_sem
);
544 realdatastart
= do_mmap(0, 0, data_len
+ extra
+
545 MAX_SHARED_LIBS
* sizeof(unsigned long),
546 PROT_READ
|PROT_WRITE
|PROT_EXEC
, MAP_PRIVATE
, 0);
547 up_write(¤t
->mm
->mmap_sem
);
549 if (realdatastart
== 0 || realdatastart
>= (unsigned long)-4096) {
551 realdatastart
= (unsigned long) -ENOMEM
;
552 printk("Unable to allocate RAM for process data, errno %d\n",
554 do_munmap(current
->mm
, textpos
, text_len
);
558 datapos
= realdatastart
+ MAX_SHARED_LIBS
* sizeof(unsigned long);
560 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
561 (int)(data_len
+ bss_len
+ stack_len
), (int)datapos
);
563 fpos
= ntohl(hdr
->data_start
);
564 #ifdef CONFIG_BINFMT_ZFLAT
565 if (flags
& FLAT_FLAG_GZDATA
) {
566 result
= decompress_exec(bprm
, fpos
, (char *) datapos
,
567 data_len
+ (relocs
* sizeof(unsigned long)), 0);
571 result
= bprm
->file
->f_op
->read(bprm
->file
, (char *) datapos
,
572 data_len
+ (relocs
* sizeof(unsigned long)), &fpos
);
574 if (result
>= (unsigned long)-4096) {
575 printk("Unable to read data+bss, errno %d\n", (int)-result
);
576 do_munmap(current
->mm
, textpos
, text_len
);
577 do_munmap(current
->mm
, realdatastart
, data_len
+ extra
);
582 reloc
= (unsigned long *) (datapos
+(ntohl(hdr
->reloc_start
)-text_len
));
583 memp
= realdatastart
;
587 down_write(¤t
->mm
->mmap_sem
);
588 textpos
= do_mmap(0, 0, text_len
+ data_len
+ extra
+
589 MAX_SHARED_LIBS
* sizeof(unsigned long),
590 PROT_READ
| PROT_EXEC
| PROT_WRITE
, MAP_PRIVATE
, 0);
591 up_write(¤t
->mm
->mmap_sem
);
592 if (!textpos
|| textpos
>= (unsigned long) -4096) {
594 textpos
= (unsigned long) -ENOMEM
;
595 printk("Unable to allocate RAM for process text/data, errno %d\n",
601 realdatastart
= textpos
+ ntohl(hdr
->data_start
);
602 datapos
= realdatastart
+ MAX_SHARED_LIBS
* sizeof(unsigned long);
603 reloc
= (unsigned long *) (textpos
+ ntohl(hdr
->reloc_start
) +
604 MAX_SHARED_LIBS
* sizeof(unsigned long));
607 #ifdef CONFIG_BINFMT_ZFLAT
609 * load it all in and treat it like a RAM load from now on
611 if (flags
& FLAT_FLAG_GZIP
) {
612 result
= decompress_exec(bprm
, sizeof (struct flat_hdr
),
613 (((char *) textpos
) + sizeof (struct flat_hdr
)),
614 (text_len
+ data_len
+ (relocs
* sizeof(unsigned long))
615 - sizeof (struct flat_hdr
)),
617 memmove((void *) datapos
, (void *) realdatastart
,
618 data_len
+ (relocs
* sizeof(unsigned long)));
619 } else if (flags
& FLAT_FLAG_GZDATA
) {
621 result
= bprm
->file
->f_op
->read(bprm
->file
,
622 (char *) textpos
, text_len
, &fpos
);
623 if (result
< (unsigned long) -4096)
624 result
= decompress_exec(bprm
, text_len
, (char *) datapos
,
625 data_len
+ (relocs
* sizeof(unsigned long)), 0);
631 result
= bprm
->file
->f_op
->read(bprm
->file
,
632 (char *) textpos
, text_len
, &fpos
);
633 if (result
< (unsigned long) -4096) {
634 fpos
= ntohl(hdr
->data_start
);
635 result
= bprm
->file
->f_op
->read(bprm
->file
, (char *) datapos
,
636 data_len
+ (relocs
* sizeof(unsigned long)), &fpos
);
639 if (result
>= (unsigned long)-4096) {
640 printk("Unable to read code+data+bss, errno %d\n",(int)-result
);
641 do_munmap(current
->mm
, textpos
, text_len
+ data_len
+ extra
+
642 MAX_SHARED_LIBS
* sizeof(unsigned long));
648 if (flags
& FLAT_FLAG_KTRACE
)
649 printk("Mapping is %x, Entry point is %x, data_start is %x\n",
650 (int)textpos
, 0x00ffffff&ntohl(hdr
->entry
), ntohl(hdr
->data_start
));
652 /* The main program needs a little extra setup in the task structure */
653 start_code
= textpos
+ sizeof (struct flat_hdr
);
654 end_code
= textpos
+ text_len
;
656 current
->mm
->start_code
= start_code
;
657 current
->mm
->end_code
= end_code
;
658 current
->mm
->start_data
= datapos
;
659 current
->mm
->end_data
= datapos
+ data_len
;
661 * set up the brk stuff, uses any slack left in data/bss/stack
662 * allocation. We put the brk after the bss (between the bss
663 * and stack) like other platforms.
665 current
->mm
->start_brk
= datapos
+ data_len
+ bss_len
;
666 current
->mm
->brk
= (current
->mm
->start_brk
+ 3) & ~3;
667 current
->mm
->context
.end_brk
= memp
+ ksize((void *) memp
) - stack_len
;
670 if (flags
& FLAT_FLAG_KTRACE
)
671 printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
672 id
? "Lib" : "Load", bprm
->filename
,
673 (int) start_code
, (int) end_code
,
675 (int) (datapos
+ data_len
),
676 (int) (datapos
+ data_len
),
677 (int) (((datapos
+ data_len
+ bss_len
) + 3) & ~3));
679 text_len
-= sizeof(struct flat_hdr
); /* the real code len */
681 /* Store the current module values into the global library structure */
682 libinfo
->lib_list
[id
].start_code
= start_code
;
683 libinfo
->lib_list
[id
].start_data
= datapos
;
684 libinfo
->lib_list
[id
].start_brk
= datapos
+ data_len
+ bss_len
;
685 libinfo
->lib_list
[id
].text_len
= text_len
;
686 libinfo
->lib_list
[id
].loaded
= 1;
687 libinfo
->lib_list
[id
].entry
= (0x00ffffff & ntohl(hdr
->entry
)) + textpos
;
688 libinfo
->lib_list
[id
].build_date
= ntohl(hdr
->build_date
);
691 * We just load the allocations into some temporary memory to
692 * help simplify all this mumbo jumbo
694 * We've got two different sections of relocation entries.
695 * The first is the GOT which resides at the begining of the data segment
696 * and is terminated with a -1. This one can be relocated in place.
697 * The second is the extra relocation entries tacked after the image's
698 * data segment. These require a little more processing as the entry is
699 * really an offset into the image which contains an offset into the
702 if (flags
& FLAT_FLAG_GOTPIC
) {
703 for (rp
= (unsigned long *)datapos
; *rp
!= 0xffffffff; rp
++) {
706 addr
= calc_reloc(*rp
, libinfo
, id
, 0);
707 if (addr
== RELOC_FAILED
) {
717 * Now run through the relocation entries.
718 * We've got to be careful here as C++ produces relocatable zero
719 * entries in the constructor and destructor tables which are then
720 * tested for being not zero (which will always occur unless we're
721 * based from address zero). This causes an endless loop as __start
722 * is at zero. The solution used is to not relocate zero addresses.
723 * This has the negative side effect of not allowing a global data
724 * reference to be statically initialised to _stext (I've moved
725 * __start to address 4 so that is okay).
727 if (rev
> OLD_FLAT_VERSION
) {
728 for (i
=0; i
< relocs
; i
++) {
729 unsigned long addr
, relval
;
731 /* Get the address of the pointer to be
732 relocated (of course, the address has to be
734 relval
= ntohl(reloc
[i
]);
735 addr
= flat_get_relocate_addr(relval
);
736 rp
= (unsigned long *) calc_reloc(addr
, libinfo
, id
, 1);
737 if (rp
== (unsigned long *)RELOC_FAILED
) {
742 /* Get the pointer's value. */
743 addr
= flat_get_addr_from_rp(rp
, relval
, flags
);
746 * Do the relocation. PIC relocs in the data section are
747 * already in target order
749 if ((flags
& FLAT_FLAG_GOTPIC
) == 0)
751 addr
= calc_reloc(addr
, libinfo
, id
, 0);
752 if (addr
== RELOC_FAILED
) {
757 /* Write back the relocated pointer. */
758 flat_put_addr_at_rp(rp
, addr
, relval
);
762 for (i
=0; i
< relocs
; i
++)
763 old_reloc(ntohl(reloc
[i
]));
766 flush_icache_range(start_code
, end_code
);
768 /* zero the BSS, BRK and stack areas */
769 memset((void*)(datapos
+ data_len
), 0, bss_len
+
770 (memp
+ ksize((void *) memp
) - stack_len
- /* end brk */
771 libinfo
->lib_list
[id
].start_brk
) + /* start brk */
780 /****************************************************************************/
781 #ifdef CONFIG_BINFMT_SHARED_FLAT
784 * Load a shared library into memory. The library gets its own data
785 * segment (including bss) but not argv/argc/environ.
788 static int load_flat_shared_library(int id
, struct lib_info
*libs
)
790 struct linux_binprm bprm
;
794 /* Create the file name */
795 sprintf(buf
, "/lib/lib%d.so", id
);
797 /* Open the file up */
799 bprm
.file
= open_exec(bprm
.filename
);
800 res
= PTR_ERR(bprm
.file
);
801 if (IS_ERR(bprm
.file
))
804 res
= prepare_binprm(&bprm
);
806 if (res
<= (unsigned long)-4096)
807 res
= load_flat_file(&bprm
, libs
, id
, NULL
);
809 allow_write_access(bprm
.file
);
816 #endif /* CONFIG_BINFMT_SHARED_FLAT */
817 /****************************************************************************/
820 * These are the functions used to load flat style executables and shared
821 * libraries. There is no binary dependent code anywhere else.
824 static int load_flat_binary(struct linux_binprm
* bprm
, struct pt_regs
* regs
)
826 struct lib_info libinfo
;
827 unsigned long p
= bprm
->p
;
828 unsigned long stack_len
;
829 unsigned long start_addr
;
834 memset(&libinfo
, 0, sizeof(libinfo
));
836 * We have to add the size of our arguments to our stack size
837 * otherwise it's too easy for users to create stack overflows
838 * by passing in a huge argument list. And yes, we have to be
839 * pedantic and include space for the argv/envp array as it may have
842 #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
843 stack_len
= TOP_OF_ARGS
- bprm
->p
; /* the strings */
844 stack_len
+= (bprm
->argc
+ 1) * sizeof(char *); /* the argv array */
845 stack_len
+= (bprm
->envc
+ 1) * sizeof(char *); /* the envp array */
848 res
= load_flat_file(bprm
, &libinfo
, 0, &stack_len
);
849 if (res
> (unsigned long)-4096)
852 /* Update data segment pointers for all libraries */
853 for (i
=0; i
<MAX_SHARED_LIBS
; i
++)
854 if (libinfo
.lib_list
[i
].loaded
)
855 for (j
=0; j
<MAX_SHARED_LIBS
; j
++)
856 (-(j
+1))[(unsigned long *)(libinfo
.lib_list
[i
].start_data
)] =
857 (libinfo
.lib_list
[j
].loaded
)?
858 libinfo
.lib_list
[j
].start_data
:UNLOADED_LIB
;
861 current
->flags
&= ~PF_FORKNOEXEC
;
863 set_binfmt(&flat_format
);
865 p
= ((current
->mm
->context
.end_brk
+ stack_len
+ 3) & ~3) - 4;
866 DBG_FLT("p=%x\n", (int)p
);
868 /* copy the arg pages onto the stack, this could be more efficient :-) */
869 for (i
= TOP_OF_ARGS
- 1; i
>= bprm
->p
; i
--)
871 ((char *) page_address(bprm
->page
[i
/PAGE_SIZE
]))[i
% PAGE_SIZE
];
873 sp
= (unsigned long *) create_flat_tables(p
, bprm
);
875 /* Fake some return addresses to ensure the call chain will
876 * initialise library in order for us. We are required to call
877 * lib 1 first, then 2, ... and finally the main program (id 0).
879 start_addr
= libinfo
.lib_list
[0].entry
;
881 #ifdef CONFIG_BINFMT_SHARED_FLAT
882 for (i
= MAX_SHARED_LIBS
-1; i
>0; i
--) {
883 if (libinfo
.lib_list
[i
].loaded
) {
884 /* Push previos first to call address */
885 --sp
; put_user(start_addr
, sp
);
886 start_addr
= libinfo
.lib_list
[i
].entry
;
891 /* Stash our initial stack pointer into the mm structure */
892 current
->mm
->start_stack
= (unsigned long )sp
;
895 DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n",
896 (int)regs
, (int)start_addr
, (int)current
->mm
->start_stack
);
898 start_thread(regs
, start_addr
, current
->mm
->start_stack
);
900 if (current
->ptrace
& PT_PTRACED
)
901 send_sig(SIGTRAP
, current
, 0);
906 /****************************************************************************/
908 static int __init
init_flat_binfmt(void)
910 return register_binfmt(&flat_format
);
913 static void __exit
exit_flat_binfmt(void)
915 unregister_binfmt(&flat_format
);
918 /****************************************************************************/
920 core_initcall(init_flat_binfmt
);
921 module_exit(exit_flat_binfmt
);
923 /****************************************************************************/
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