2 * a.out loader for x86-64
4 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
5 * Hacked together by Andi Kleen
8 #include <linux/module.h>
10 #include <linux/time.h>
11 #include <linux/kernel.h>
13 #include <linux/mman.h>
14 #include <linux/a.out.h>
15 #include <linux/errno.h>
16 #include <linux/signal.h>
17 #include <linux/string.h>
19 #include <linux/file.h>
20 #include <linux/stat.h>
21 #include <linux/fcntl.h>
22 #include <linux/ptrace.h>
23 #include <linux/user.h>
24 #include <linux/binfmts.h>
25 #include <linux/personality.h>
26 #include <linux/init.h>
27 #include <linux/jiffies.h>
29 #include <asm/system.h>
30 #include <asm/uaccess.h>
31 #include <asm/pgalloc.h>
32 #include <asm/cacheflush.h>
33 #include <asm/user32.h>
37 #undef CORE_DUMP /* definitely broken */
39 static int load_aout_binary(struct linux_binprm
*, struct pt_regs
*regs
);
40 static int load_aout_library(struct file
*);
43 static int aout_core_dump(long signr
, struct pt_regs
*regs
, struct file
*file
,
47 * fill in the user structure for a core dump..
49 static void dump_thread32(struct pt_regs
*regs
, struct user32
*dump
)
53 /* changed the size calculations - should hopefully work better. lbt */
56 dump
->start_stack
= regs
->sp
& ~(PAGE_SIZE
- 1);
57 dump
->u_tsize
= ((unsigned long) current
->mm
->end_code
) >> PAGE_SHIFT
;
58 dump
->u_dsize
= ((unsigned long)
59 (current
->mm
->brk
+ (PAGE_SIZE
-1))) >> PAGE_SHIFT
;
60 dump
->u_dsize
-= dump
->u_tsize
;
62 dump
->u_debugreg
[0] = current
->thread
.debugreg0
;
63 dump
->u_debugreg
[1] = current
->thread
.debugreg1
;
64 dump
->u_debugreg
[2] = current
->thread
.debugreg2
;
65 dump
->u_debugreg
[3] = current
->thread
.debugreg3
;
66 dump
->u_debugreg
[4] = 0;
67 dump
->u_debugreg
[5] = 0;
68 dump
->u_debugreg
[6] = current
->thread
.debugreg6
;
69 dump
->u_debugreg
[7] = current
->thread
.debugreg7
;
71 if (dump
->start_stack
< 0xc0000000) {
74 tmp
= (unsigned long) (0xc0000000 - dump
->start_stack
);
75 dump
->u_ssize
= tmp
>> PAGE_SHIFT
;
78 dump
->regs
.bx
= regs
->bx
;
79 dump
->regs
.cx
= regs
->cx
;
80 dump
->regs
.dx
= regs
->dx
;
81 dump
->regs
.si
= regs
->si
;
82 dump
->regs
.di
= regs
->di
;
83 dump
->regs
.bp
= regs
->bp
;
84 dump
->regs
.ax
= regs
->ax
;
85 dump
->regs
.ds
= current
->thread
.ds
;
86 dump
->regs
.es
= current
->thread
.es
;
91 dump
->regs
.orig_ax
= regs
->orig_ax
;
92 dump
->regs
.ip
= regs
->ip
;
93 dump
->regs
.cs
= regs
->cs
;
94 dump
->regs
.flags
= regs
->flags
;
95 dump
->regs
.sp
= regs
->sp
;
96 dump
->regs
.ss
= regs
->ss
;
101 dump
->u_fpvalid
= dump_fpu(regs
, &dump
->i387
);
107 static struct linux_binfmt aout_format
= {
108 .module
= THIS_MODULE
,
109 .load_binary
= load_aout_binary
,
110 .load_shlib
= load_aout_library
,
112 .core_dump
= aout_core_dump
,
114 .min_coredump
= PAGE_SIZE
117 static void set_brk(unsigned long start
, unsigned long end
)
119 start
= PAGE_ALIGN(start
);
120 end
= PAGE_ALIGN(end
);
123 down_write(¤t
->mm
->mmap_sem
);
124 do_brk(start
, end
- start
);
125 up_write(¤t
->mm
->mmap_sem
);
130 * These are the only things you should do on a core-file: use only these
131 * macros to write out all the necessary info.
134 #include <linux/coredump.h>
136 #define DUMP_WRITE(addr, nr) \
137 if (!dump_write(file, (void *)(addr), (nr))) \
140 #define DUMP_SEEK(offset) \
141 if (!dump_seek(file, offset)) \
144 #define START_DATA() (u.u_tsize << PAGE_SHIFT)
145 #define START_STACK(u) (u.start_stack)
148 * Routine writes a core dump image in the current directory.
149 * Currently only a stub-function.
151 * Note that setuid/setgid files won't make a core-dump if the uid/gid
152 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
153 * field, which also makes sure the core-dumps won't be recursive if the
154 * dumping of the process results in another error..
157 static int aout_core_dump(long signr
, struct pt_regs
*regs
, struct file
*file
,
162 unsigned long dump_start
, dump_size
;
168 current
->flags
|= PF_DUMPCORE
;
169 strncpy(dump
.u_comm
, current
->comm
, sizeof(current
->comm
));
170 dump
.u_ar0
= offsetof(struct user32
, regs
);
172 dump_thread32(regs
, &dump
);
175 * If the size of the dump file exceeds the rlimit, then see
176 * what would happen if we wrote the stack, but not the data
179 if ((dump
.u_dsize
+ dump
.u_ssize
+ 1) * PAGE_SIZE
> limit
)
182 /* Make sure we have enough room to write the stack and data areas. */
183 if ((dump
.u_ssize
+ 1) * PAGE_SIZE
> limit
)
186 /* make sure we actually have a data and stack area to dump */
188 if (!access_ok(VERIFY_READ
, (void *) (unsigned long)START_DATA(dump
),
189 dump
.u_dsize
<< PAGE_SHIFT
))
191 if (!access_ok(VERIFY_READ
, (void *) (unsigned long)START_STACK(dump
),
192 dump
.u_ssize
<< PAGE_SHIFT
))
197 DUMP_WRITE(&dump
, sizeof(dump
));
198 /* Now dump all of the user data. Include malloced stuff as well */
199 DUMP_SEEK(PAGE_SIZE
);
200 /* now we start writing out the user space info */
202 /* Dump the data area */
203 if (dump
.u_dsize
!= 0) {
204 dump_start
= START_DATA(dump
);
205 dump_size
= dump
.u_dsize
<< PAGE_SHIFT
;
206 DUMP_WRITE(dump_start
, dump_size
);
208 /* Now prepare to dump the stack area */
209 if (dump
.u_ssize
!= 0) {
210 dump_start
= START_STACK(dump
);
211 dump_size
= dump
.u_ssize
<< PAGE_SHIFT
;
212 DUMP_WRITE(dump_start
, dump_size
);
221 * create_aout_tables() parses the env- and arg-strings in new user
222 * memory and creates the pointer tables from them, and puts their
223 * addresses on the "stack", returning the new stack pointer value.
225 static u32 __user
*create_aout_tables(char __user
*p
, struct linux_binprm
*bprm
)
227 u32 __user
*argv
, *envp
, *sp
;
228 int argc
= bprm
->argc
, envc
= bprm
->envc
;
230 sp
= (u32 __user
*) ((-(unsigned long)sizeof(u32
)) & (unsigned long) p
);
235 put_user((unsigned long) envp
, --sp
);
236 put_user((unsigned long) argv
, --sp
);
237 put_user(argc
, --sp
);
238 current
->mm
->arg_start
= (unsigned long) p
;
242 put_user((u32
)(unsigned long)p
, argv
++);
248 current
->mm
->arg_end
= current
->mm
->env_start
= (unsigned long) p
;
252 put_user((u32
)(unsigned long)p
, envp
++);
258 current
->mm
->env_end
= (unsigned long) p
;
263 * These are the functions used to load a.out style executables and shared
264 * libraries. There is no binary dependent code anywhere else.
266 static int load_aout_binary(struct linux_binprm
*bprm
, struct pt_regs
*regs
)
268 unsigned long error
, fd_offset
, rlim
;
272 ex
= *((struct exec
*) bprm
->buf
); /* exec-header */
273 if ((N_MAGIC(ex
) != ZMAGIC
&& N_MAGIC(ex
) != OMAGIC
&&
274 N_MAGIC(ex
) != QMAGIC
&& N_MAGIC(ex
) != NMAGIC
) ||
275 N_TRSIZE(ex
) || N_DRSIZE(ex
) ||
276 i_size_read(bprm
->file
->f_path
.dentry
->d_inode
) <
277 ex
.a_text
+ex
.a_data
+N_SYMSIZE(ex
)+N_TXTOFF(ex
)) {
281 fd_offset
= N_TXTOFF(ex
);
283 /* Check initial limits. This avoids letting people circumvent
284 * size limits imposed on them by creating programs with large
285 * arrays in the data or bss.
287 rlim
= rlimit(RLIMIT_DATA
);
288 if (rlim
>= RLIM_INFINITY
)
290 if (ex
.a_data
+ ex
.a_bss
> rlim
)
293 /* Flush all traces of the currently running executable */
294 retval
= flush_old_exec(bprm
);
298 /* OK, This is the point of no return */
299 set_personality(PER_LINUX
);
300 set_thread_flag(TIF_IA32
);
302 setup_new_exec(bprm
);
304 regs
->cs
= __USER32_CS
;
305 regs
->r8
= regs
->r9
= regs
->r10
= regs
->r11
= regs
->r12
=
306 regs
->r13
= regs
->r14
= regs
->r15
= 0;
308 current
->mm
->end_code
= ex
.a_text
+
309 (current
->mm
->start_code
= N_TXTADDR(ex
));
310 current
->mm
->end_data
= ex
.a_data
+
311 (current
->mm
->start_data
= N_DATADDR(ex
));
312 current
->mm
->brk
= ex
.a_bss
+
313 (current
->mm
->start_brk
= N_BSSADDR(ex
));
314 current
->mm
->free_area_cache
= TASK_UNMAPPED_BASE
;
315 current
->mm
->cached_hole_size
= 0;
317 install_exec_creds(bprm
);
318 current
->flags
&= ~PF_FORKNOEXEC
;
320 if (N_MAGIC(ex
) == OMAGIC
) {
321 unsigned long text_addr
, map_size
;
324 text_addr
= N_TXTADDR(ex
);
327 map_size
= ex
.a_text
+ex
.a_data
;
329 down_write(¤t
->mm
->mmap_sem
);
330 error
= do_brk(text_addr
& PAGE_MASK
, map_size
);
331 up_write(¤t
->mm
->mmap_sem
);
333 if (error
!= (text_addr
& PAGE_MASK
)) {
334 send_sig(SIGKILL
, current
, 0);
338 error
= bprm
->file
->f_op
->read(bprm
->file
,
339 (char __user
*)text_addr
,
340 ex
.a_text
+ex
.a_data
, &pos
);
341 if ((signed long)error
< 0) {
342 send_sig(SIGKILL
, current
, 0);
346 flush_icache_range(text_addr
, text_addr
+ex
.a_text
+ex
.a_data
);
349 static unsigned long error_time
, error_time2
;
350 if ((ex
.a_text
& 0xfff || ex
.a_data
& 0xfff) &&
351 (N_MAGIC(ex
) != NMAGIC
) &&
352 time_after(jiffies
, error_time2
+ 5*HZ
)) {
353 printk(KERN_NOTICE
"executable not page aligned\n");
354 error_time2
= jiffies
;
357 if ((fd_offset
& ~PAGE_MASK
) != 0 &&
358 time_after(jiffies
, error_time
+ 5*HZ
)) {
360 "fd_offset is not page aligned. Please convert "
362 bprm
->file
->f_path
.dentry
->d_name
.name
);
363 error_time
= jiffies
;
367 if (!bprm
->file
->f_op
->mmap
|| (fd_offset
& ~PAGE_MASK
) != 0) {
368 loff_t pos
= fd_offset
;
370 down_write(¤t
->mm
->mmap_sem
);
371 do_brk(N_TXTADDR(ex
), ex
.a_text
+ex
.a_data
);
372 up_write(¤t
->mm
->mmap_sem
);
373 bprm
->file
->f_op
->read(bprm
->file
,
374 (char __user
*)N_TXTADDR(ex
),
375 ex
.a_text
+ex
.a_data
, &pos
);
376 flush_icache_range((unsigned long) N_TXTADDR(ex
),
377 (unsigned long) N_TXTADDR(ex
) +
378 ex
.a_text
+ex
.a_data
);
382 down_write(¤t
->mm
->mmap_sem
);
383 error
= do_mmap(bprm
->file
, N_TXTADDR(ex
), ex
.a_text
,
384 PROT_READ
| PROT_EXEC
,
385 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
|
386 MAP_EXECUTABLE
| MAP_32BIT
,
388 up_write(¤t
->mm
->mmap_sem
);
390 if (error
!= N_TXTADDR(ex
)) {
391 send_sig(SIGKILL
, current
, 0);
395 down_write(¤t
->mm
->mmap_sem
);
396 error
= do_mmap(bprm
->file
, N_DATADDR(ex
), ex
.a_data
,
397 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
398 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
|
399 MAP_EXECUTABLE
| MAP_32BIT
,
400 fd_offset
+ ex
.a_text
);
401 up_write(¤t
->mm
->mmap_sem
);
402 if (error
!= N_DATADDR(ex
)) {
403 send_sig(SIGKILL
, current
, 0);
408 set_binfmt(&aout_format
);
410 set_brk(current
->mm
->start_brk
, current
->mm
->brk
);
412 retval
= setup_arg_pages(bprm
, IA32_STACK_TOP
, EXSTACK_DEFAULT
);
414 /* Someone check-me: is this error path enough? */
415 send_sig(SIGKILL
, current
, 0);
419 current
->mm
->start_stack
=
420 (unsigned long)create_aout_tables((char __user
*)bprm
->p
, bprm
);
423 loadsegment(ds
, __USER32_DS
);
424 loadsegment(es
, __USER32_DS
);
426 (regs
)->ip
= ex
.a_entry
;
427 (regs
)->sp
= current
->mm
->start_stack
;
428 (regs
)->flags
= 0x200;
429 (regs
)->cs
= __USER32_CS
;
430 (regs
)->ss
= __USER32_DS
;
431 regs
->r8
= regs
->r9
= regs
->r10
= regs
->r11
=
432 regs
->r12
= regs
->r13
= regs
->r14
= regs
->r15
= 0;
437 static int load_aout_library(struct file
*file
)
440 unsigned long bss
, start_addr
, len
, error
;
444 inode
= file
->f_path
.dentry
->d_inode
;
447 error
= kernel_read(file
, 0, (char *) &ex
, sizeof(ex
));
448 if (error
!= sizeof(ex
))
451 /* We come in here for the regular a.out style of shared libraries */
452 if ((N_MAGIC(ex
) != ZMAGIC
&& N_MAGIC(ex
) != QMAGIC
) || N_TRSIZE(ex
) ||
453 N_DRSIZE(ex
) || ((ex
.a_entry
& 0xfff) && N_MAGIC(ex
) == ZMAGIC
) ||
455 ex
.a_text
+ex
.a_data
+N_SYMSIZE(ex
)+N_TXTOFF(ex
)) {
462 /* For QMAGIC, the starting address is 0x20 into the page. We mask
463 this off to get the starting address for the page */
465 start_addr
= ex
.a_entry
& 0xfffff000;
467 if ((N_TXTOFF(ex
) & ~PAGE_MASK
) != 0) {
468 loff_t pos
= N_TXTOFF(ex
);
471 static unsigned long error_time
;
472 if (time_after(jiffies
, error_time
+ 5*HZ
)) {
474 "N_TXTOFF is not page aligned. Please convert "
476 file
->f_path
.dentry
->d_name
.name
);
477 error_time
= jiffies
;
480 down_write(¤t
->mm
->mmap_sem
);
481 do_brk(start_addr
, ex
.a_text
+ ex
.a_data
+ ex
.a_bss
);
482 up_write(¤t
->mm
->mmap_sem
);
484 file
->f_op
->read(file
, (char __user
*)start_addr
,
485 ex
.a_text
+ ex
.a_data
, &pos
);
486 flush_icache_range((unsigned long) start_addr
,
487 (unsigned long) start_addr
+ ex
.a_text
+
493 /* Now use mmap to map the library into memory. */
494 down_write(¤t
->mm
->mmap_sem
);
495 error
= do_mmap(file
, start_addr
, ex
.a_text
+ ex
.a_data
,
496 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
497 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
| MAP_32BIT
,
499 up_write(¤t
->mm
->mmap_sem
);
501 if (error
!= start_addr
)
504 len
= PAGE_ALIGN(ex
.a_text
+ ex
.a_data
);
505 bss
= ex
.a_text
+ ex
.a_data
+ ex
.a_bss
;
507 down_write(¤t
->mm
->mmap_sem
);
508 error
= do_brk(start_addr
+ len
, bss
- len
);
509 up_write(¤t
->mm
->mmap_sem
);
511 if (error
!= start_addr
+ len
)
519 static int __init
init_aout_binfmt(void)
521 return register_binfmt(&aout_format
);
524 static void __exit
exit_aout_binfmt(void)
526 unregister_binfmt(&aout_format
);
529 module_init(init_aout_binfmt
);
530 module_exit(exit_aout_binfmt
);
531 MODULE_LICENSE("GPL");