[linux-block.git] / arch / x86 / ia32 / ia32_aout.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  a.out loader for x86-64
 *
 *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
 *  Hacked together by Andi Kleen
 */

#include <linux/module.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/a.out.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/binfmts.h>
#include <linux/personality.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/perf_event.h>
#include <linux/sched/task_stack.h>

#include <linux/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/user32.h>
#include <asm/ia32.h>

#undef WARN_OLD

static int load_aout_binary(struct linux_binprm *);
static int load_aout_library(struct file *);

static struct linux_binfmt aout_format = {
	.module		= THIS_MODULE,
	.load_binary	= load_aout_binary,
	.load_shlib	= load_aout_library,
};

static int set_brk(unsigned long start, unsigned long end)
{
	start = PAGE_ALIGN(start);
	end = PAGE_ALIGN(end);
	if (end <= start)
		return 0;
	return vm_brk(start, end - start);
}


/*
 * create_aout_tables() parses the env- and arg-strings in new user
 * memory and creates the pointer tables from them, and puts their
 * addresses on the "stack", returning the new stack pointer value.
 */
static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
{
	u32 __user *argv, *envp, *sp;
	int argc = bprm->argc, envc = bprm->envc;

	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
	sp -= envc+1;
	envp = sp;
	sp -= argc+1;
	argv = sp;
	put_user((unsigned long) envp, --sp);
	put_user((unsigned long) argv, --sp);
	put_user(argc, --sp);
	current->mm->arg_start = (unsigned long) p;
	while (argc-- > 0) {
		char c;

		put_user((u32)(unsigned long)p, argv++);
		do {
			get_user(c, p++);
		} while (c);
	}
	put_user(0, argv);
	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
	while (envc-- > 0) {
		char c;

		put_user((u32)(unsigned long)p, envp++);
		do {
			get_user(c, p++);
		} while (c);
	}
	put_user(0, envp);
	current->mm->env_end = (unsigned long) p;
	return sp;
}

/*
 * These are the functions used to load a.out style executables and shared
 * libraries.  There is no binary dependent code anywhere else.
 */
static int load_aout_binary(struct linux_binprm *bprm)
{
	unsigned long error, fd_offset, rlim;
	struct pt_regs *regs = current_pt_regs();
	struct exec ex;
	int retval;

	ex = *((struct exec *) bprm->buf);		/* exec-header */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
	    i_size_read(file_inode(bprm->file)) <
	    ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		return -ENOEXEC;
	}

	fd_offset = N_TXTOFF(ex);

	/* Check initial limits. This avoids letting people circumvent
	 * size limits imposed on them by creating programs with large
	 * arrays in the data or bss.
	 */
	rlim = rlimit(RLIMIT_DATA);
	if (rlim >= RLIM_INFINITY)
		rlim = ~0;
	if (ex.a_data + ex.a_bss > rlim)
		return -ENOMEM;

	/* Flush all traces of the currently running executable */
	retval = flush_old_exec(bprm);
	if (retval)
		return retval;

	/* OK, This is the point of no return */
	set_personality(PER_LINUX);
	set_personality_ia32(false);

	setup_new_exec(bprm);

	regs->cs = __USER32_CS;
	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
		regs->r13 = regs->r14 = regs->r15 = 0;

	current->mm->end_code = ex.a_text +
		(current->mm->start_code = N_TXTADDR(ex));
	current->mm->end_data = ex.a_data +
		(current->mm->start_data = N_DATADDR(ex));
	current->mm->brk = ex.a_bss +
		(current->mm->start_brk = N_BSSADDR(ex));

	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
	if (retval < 0)
		return retval;

	install_exec_creds(bprm);

	if (N_MAGIC(ex) == OMAGIC) {
		unsigned long text_addr, map_size;

		text_addr = N_TXTADDR(ex);
		map_size = ex.a_text+ex.a_data;

		error = vm_brk(text_addr & PAGE_MASK, map_size);

		if (error)
			return error;

		error = read_code(bprm->file, text_addr, 32,
				  ex.a_text + ex.a_data);
		if ((signed long)error < 0)
			return error;
	} else {
#ifdef WARN_OLD
		static unsigned long error_time, error_time2;
		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
		    (N_MAGIC(ex) != NMAGIC) &&
				time_after(jiffies, error_time2 + 5*HZ)) {
			printk(KERN_NOTICE "executable not page aligned\n");
			error_time2 = jiffies;
		}

		if ((fd_offset & ~PAGE_MASK) != 0 &&
			    time_after(jiffies, error_time + 5*HZ)) {
			printk(KERN_WARNING
			       "fd_offset is not page aligned. Please convert "
			       "program: %pD\n",
			       bprm->file);
			error_time = jiffies;
		}
#endif

		if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
			error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
			if (error)
				return error;

			read_code(bprm->file, N_TXTADDR(ex), fd_offset,
					ex.a_text+ex.a_data);
			goto beyond_if;
		}

		error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
				PROT_READ | PROT_EXEC,
				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
				MAP_EXECUTABLE | MAP_32BIT,
				fd_offset);

		if (error != N_TXTADDR(ex))
			return error;

		error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
				PROT_READ | PROT_WRITE | PROT_EXEC,
				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
				MAP_EXECUTABLE | MAP_32BIT,
				fd_offset + ex.a_text);
		if (error != N_DATADDR(ex))
			return error;
	}

beyond_if:
	error = set_brk(current->mm->start_brk, current->mm->brk);
	if (error)
		return error;

	set_binfmt(&aout_format);

	current->mm->start_stack =
		(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	/* start thread */
	loadsegment(fs, 0);
	loadsegment(ds, __USER32_DS);
	loadsegment(es, __USER32_DS);
	load_gs_index(0);
	(regs)->ip = ex.a_entry;
	(regs)->sp = current->mm->start_stack;
	(regs)->flags = 0x200;
	(regs)->cs = __USER32_CS;
	(regs)->ss = __USER32_DS;
	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
	set_fs(USER_DS);
	return 0;
}

static int load_aout_library(struct file *file)
{
	unsigned long bss, start_addr, len, error;
	int retval;
	struct exec ex;
	loff_t pos = 0;

	retval = -ENOEXEC;
	error = kernel_read(file, &ex, sizeof(ex), &pos);
	if (error != sizeof(ex))
		goto out;

	/* We come in here for the regular a.out style of shared libraries */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
	    N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
	    i_size_read(file_inode(file)) <
	    ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		goto out;
	}

	if (N_FLAGS(ex))
		goto out;

	/* For  QMAGIC, the starting address is 0x20 into the page.  We mask
	   this off to get the starting address for the page */

	start_addr =  ex.a_entry & 0xfffff000;

	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
#ifdef WARN_OLD
		static unsigned long error_time;
		if (time_after(jiffies, error_time + 5*HZ)) {
			printk(KERN_WARNING
			       "N_TXTOFF is not page aligned. Please convert "
			       "library: %pD\n",
			       file);
			error_time = jiffies;
		}
#endif
		retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
		if (retval)
			goto out;

		read_code(file, start_addr, N_TXTOFF(ex),
			  ex.a_text + ex.a_data);
		retval = 0;
		goto out;
	}
	/* Now use mmap to map the library into memory. */
	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
			PROT_READ | PROT_WRITE | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
			N_TXTOFF(ex));
	retval = error;
	if (error != start_addr)
		goto out;

	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	bss = ex.a_text + ex.a_data + ex.a_bss;
	if (bss > len) {
		retval = vm_brk(start_addr + len, bss - len);
		if (retval)
			goto out;
	}
	retval = 0;
out:
	return retval;
}

static int __init init_aout_binfmt(void)
{
	register_binfmt(&aout_format);
	return 0;
}

static void __exit exit_aout_binfmt(void)
{
	unregister_binfmt(&aout_format);
}

module_init(init_aout_binfmt);
module_exit(exit_aout_binfmt);
MODULE_LICENSE("GPL");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* a.out loader for x86-64
	4	*
	5	* Copyright (C) 1991, 1992, 1996 Linus Torvalds
	6	* Hacked together by Andi Kleen
	7	*/
	8
	9	#include <linux/module.h>
	10
	11	#include <linux/time.h>
	12	#include <linux/kernel.h>
	13	#include <linux/mm.h>
	14	#include <linux/mman.h>
	15	#include <linux/a.out.h>
	16	#include <linux/errno.h>
	17	#include <linux/signal.h>
	18	#include <linux/string.h>
	19	#include <linux/fs.h>
	20	#include <linux/file.h>
	21	#include <linux/stat.h>
	22	#include <linux/fcntl.h>
	23	#include <linux/ptrace.h>
	24	#include <linux/user.h>
1da177e4 LT	25	#include <linux/binfmts.h>
	26	#include <linux/personality.h>
	27	#include <linux/init.h>
e5fc3161	28	#include <linux/jiffies.h>
7d2f551f	29	#include <linux/perf_event.h>
68db0cf1	30	#include <linux/sched/task_stack.h>
1da177e4	31
7c0f6ba6	32	#include <linux/uaccess.h>
1da177e4 LT	33	#include <asm/pgalloc.h>
	34	#include <asm/cacheflush.h>
	35	#include <asm/user32.h>
	36	#include <asm/ia32.h>
	37
	38	#undef WARN_OLD
1da177e4	39
71613c3b	40	static int load_aout_binary(struct linux_binprm *);
8edf8bee	41	static int load_aout_library(struct file *);
1da177e4	42
1da177e4 LT	43	static struct linux_binfmt aout_format = {
	44	.module = THIS_MODULE,
	45	.load_binary = load_aout_binary,
	46	.load_shlib = load_aout_library,
1da177e4 LT	47	};
1da177e4 LT	48
5d22fc25	49	static int set_brk(unsigned long start, unsigned long end)
1da177e4 LT	50	{
	51	start = PAGE_ALIGN(start);
	52	end = PAGE_ALIGN(end);
	53	if (end <= start)
5d22fc25	54	return 0;
864778b1	55	return vm_brk(start, end - start);
1da177e4 LT	56	}
1da177e4 LT	57
1da177e4 LT	58
	59	/*
	60	* create_aout_tables() parses the env- and arg-strings in new user
	61	* memory and creates the pointer tables from them, and puts their
	62	* addresses on the "stack", returning the new stack pointer value.
	63	*/
	64	static u32 __user create_aout_tables(char __user p, struct linux_binprm *bprm)
	65	{
8edf8bee TG	66	u32 __user argv, envp, *sp;
8edf8bee TG	67	int argc = bprm->argc, envc = bprm->envc;
1da177e4 LT	68
	69	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
	70	sp -= envc+1;
	71	envp = sp;
	72	sp -= argc+1;
	73	argv = sp;
8edf8bee TG	74	put_user((unsigned long) envp, --sp);
	75	put_user((unsigned long) argv, --sp);
	76	put_user(argc, --sp);
1da177e4	77	current->mm->arg_start = (unsigned long) p;
8edf8bee	78	while (argc-- > 0) {
1da177e4	79	char c;
8edf8bee TG	80
8edf8bee TG	81	put_user((u32)(unsigned long)p, argv++);
1da177e4	82	do {
8edf8bee	83	get_user(c, p++);
1da177e4 LT	84	} while (c);
1da177e4 LT	85	}
74019699	86	put_user(0, argv);
1da177e4	87	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
8edf8bee	88	while (envc-- > 0) {
1da177e4	89	char c;
8edf8bee TG	90
8edf8bee TG	91	put_user((u32)(unsigned long)p, envp++);
1da177e4	92	do {
8edf8bee	93	get_user(c, p++);
1da177e4 LT	94	} while (c);
1da177e4 LT	95	}
74019699	96	put_user(0, envp);
1da177e4 LT	97	current->mm->env_end = (unsigned long) p;
	98	return sp;
	99	}
	100
	101	/*
	102	* These are the functions used to load a.out style executables and shared
	103	* libraries. There is no binary dependent code anywhere else.
	104	*/
71613c3b	105	static int load_aout_binary(struct linux_binprm *bprm)
1da177e4	106	{
8edf8bee	107	unsigned long error, fd_offset, rlim;
71613c3b	108	struct pt_regs *regs = current_pt_regs();
1da177e4	109	struct exec ex;
1da177e4 LT	110	int retval;
	111
	112	ex = ((struct exec ) bprm->buf); /* exec-header */
	113	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	114	N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) \|\|
	115	N_TRSIZE(ex) \|\| N_DRSIZE(ex) \|\|
496ad9aa	116	i_size_read(file_inode(bprm->file)) <
8edf8bee	117	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	118	return -ENOEXEC;
	119	}
	120
	121	fd_offset = N_TXTOFF(ex);
	122
	123	/* Check initial limits. This avoids letting people circumvent
	124	* size limits imposed on them by creating programs with large
	125	* arrays in the data or bss.
	126	*/
2854e72b	127	rlim = rlimit(RLIMIT_DATA);
1da177e4 LT	128	if (rlim >= RLIM_INFINITY)
	129	rlim = ~0;
	130	if (ex.a_data + ex.a_bss > rlim)
	131	return -ENOMEM;
	132
	133	/* Flush all traces of the currently running executable */
	134	retval = flush_old_exec(bprm);
	135	if (retval)
	136	return retval;
	137
1da177e4 LT	138	/* OK, This is the point of no return */
1da177e4 LT	139	set_personality(PER_LINUX);
ce7e5d2d	140	set_personality_ia32(false);
1da177e4	141
221af7f8 LT	142	setup_new_exec(bprm);
	143
	144	regs->cs = __USER32_CS;
	145	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
	146	regs->r13 = regs->r14 = regs->r15 = 0;
	147
1da177e4 LT	148	current->mm->end_code = ex.a_text +
	149	(current->mm->start_code = N_TXTADDR(ex));
	150	current->mm->end_data = ex.a_data +
	151	(current->mm->start_data = N_DATADDR(ex));
	152	current->mm->brk = ex.a_bss +
	153	(current->mm->start_brk = N_BSSADDR(ex));
1da177e4	154
6414fa6a	155	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
19d860a1	156	if (retval < 0)
6414fa6a	157	return retval;
6414fa6a	158
a6f76f23	159	install_exec_creds(bprm);
1da177e4 LT	160
	161	if (N_MAGIC(ex) == OMAGIC) {
	162	unsigned long text_addr, map_size;
1da177e4 LT	163
1da177e4 LT	164	text_addr = N_TXTADDR(ex);
1da177e4 LT	165	map_size = ex.a_text+ex.a_data;
1da177e4 LT	166
e4eb1ff6	167	error = vm_brk(text_addr & PAGE_MASK, map_size);
1da177e4	168
5d22fc25	169	if (error)
1da177e4	170	return error;
1da177e4	171
3dc20cb2 AV	172	error = read_code(bprm->file, text_addr, 32,
3dc20cb2 AV	173	ex.a_text + ex.a_data);
19d860a1	174	if ((signed long)error < 0)
1da177e4	175	return error;
1da177e4 LT	176	} else {
	177	#ifdef WARN_OLD
	178	static unsigned long error_time, error_time2;
	179	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
e5fc3161 JL	180	(N_MAGIC(ex) != NMAGIC) &&
e5fc3161 JL	181	time_after(jiffies, error_time2 + 5*HZ)) {
1da177e4 LT	182	printk(KERN_NOTICE "executable not page aligned\n");
	183	error_time2 = jiffies;
	184	}
	185
	186	if ((fd_offset & ~PAGE_MASK) != 0 &&
e5fc3161	187	time_after(jiffies, error_time + 5*HZ)) {
8edf8bee TG	188	printk(KERN_WARNING
8edf8bee TG	189	"fd_offset is not page aligned. Please convert "
a455589f AV	190	"program: %pD\n",
a455589f AV	191	bprm->file);
1da177e4 LT	192	error_time = jiffies;
	193	}
	194	#endif
	195
8edf8bee	196	if (!bprm->file->f_op->mmap \|\| (fd_offset & ~PAGE_MASK) != 0) {
864778b1	197	error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
5d22fc25	198	if (error)
864778b1 MH	199	return error;
864778b1 MH	200
3dc20cb2 AV	201	read_code(bprm->file, N_TXTADDR(ex), fd_offset,
3dc20cb2 AV	202	ex.a_text+ex.a_data);
1da177e4 LT	203	goto beyond_if;
	204	}
	205
6be5ceb0	206	error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
8edf8bee TG	207	PROT_READ \| PROT_EXEC,
	208	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
	209	MAP_EXECUTABLE \| MAP_32BIT,
	210	fd_offset);
1da177e4	211
19d860a1	212	if (error != N_TXTADDR(ex))
1da177e4	213	return error;
1da177e4	214
6be5ceb0	215	error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
1da177e4	216	PROT_READ \| PROT_WRITE \| PROT_EXEC,
8edf8bee TG	217	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \|
8edf8bee TG	218	MAP_EXECUTABLE \| MAP_32BIT,
1da177e4	219	fd_offset + ex.a_text);
19d860a1	220	if (error != N_DATADDR(ex))
1da177e4	221	return error;
1da177e4	222	}
864778b1	223
1da177e4	224	beyond_if:
864778b1	225	error = set_brk(current->mm->start_brk, current->mm->brk);
5d22fc25	226	if (error)
864778b1	227	return error;
1da177e4	228
864778b1	229	set_binfmt(&aout_format);
1da177e4	230
1da177e4 LT	231	current->mm->start_stack =
	232	(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
	233	/* start thread */
b6edbb1e JF	234	loadsegment(fs, 0);
	235	loadsegment(ds, __USER32_DS);
	236	loadsegment(es, __USER32_DS);
8edf8bee	237	load_gs_index(0);
65ea5b03 PA	238	(regs)->ip = ex.a_entry;
	239	(regs)->sp = current->mm->start_stack;
	240	(regs)->flags = 0x200;
1da177e4 LT	241	(regs)->cs = __USER32_CS;
1da177e4 LT	242	(regs)->ss = __USER32_DS;
f891dd18 AK	243	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
f891dd18 AK	244	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
1da177e4	245	set_fs(USER_DS);
1da177e4 LT	246	return 0;
	247	}
	248
	249	static int load_aout_library(struct file *file)
	250	{
8edf8bee	251	unsigned long bss, start_addr, len, error;
1da177e4 LT	252	int retval;
1da177e4 LT	253	struct exec ex;
bdd1d2d3	254	loff_t pos = 0;
1da177e4 LT	255
1da177e4 LT	256	retval = -ENOEXEC;
bdd1d2d3	257	error = kernel_read(file, &ex, sizeof(ex), &pos);
1da177e4 LT	258	if (error != sizeof(ex))
	259	goto out;
	260
	261	/* We come in here for the regular a.out style of shared libraries */
	262	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	263	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
496ad9aa	264	i_size_read(file_inode(file)) <
8edf8bee	265	ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
1da177e4 LT	266	goto out;
	267	}
	268
	269	if (N_FLAGS(ex))
	270	goto out;
	271
	272	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	273	this off to get the starting address for the page */
	274
	275	start_addr = ex.a_entry & 0xfffff000;
	276
	277	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
1da177e4 LT	278	#ifdef WARN_OLD
1da177e4 LT	279	static unsigned long error_time;
e5fc3161	280	if (time_after(jiffies, error_time + 5*HZ)) {
8edf8bee TG	281	printk(KERN_WARNING
8edf8bee TG	282	"N_TXTOFF is not page aligned. Please convert "
a455589f AV	283	"library: %pD\n",
a455589f AV	284	file);
1da177e4 LT	285	error_time = jiffies;
	286	}
	287	#endif
864778b1	288	retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
5d22fc25	289	if (retval)
864778b1	290	goto out;
8edf8bee	291
3dc20cb2 AV	292	read_code(file, start_addr, N_TXTOFF(ex),
3dc20cb2 AV	293	ex.a_text + ex.a_data);
1da177e4 LT	294	retval = 0;
	295	goto out;
	296	}
	297	/* Now use mmap to map the library into memory. */
6be5ceb0	298	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
1da177e4 LT	299	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	300	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_32BIT,
	301	N_TXTOFF(ex));
1da177e4 LT	302	retval = error;
	303	if (error != start_addr)
	304	goto out;
	305
	306	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	307	bss = ex.a_text + ex.a_data + ex.a_bss;
	308	if (bss > len) {
5d22fc25 LT	309	retval = vm_brk(start_addr + len, bss - len);
5d22fc25 LT	310	if (retval)
1da177e4 LT	311	goto out;
	312	}
	313	retval = 0;
	314	out:
	315	return retval;
	316	}
	317
	318	static int __init init_aout_binfmt(void)
	319	{
8fc3dc5a AV	320	register_binfmt(&aout_format);
8fc3dc5a AV	321	return 0;
1da177e4 LT	322	}
	323
	324	static void __exit exit_aout_binfmt(void)
	325	{
	326	unregister_binfmt(&aout_format);
	327	}
	328
	329	module_init(init_aout_binfmt);
	330	module_exit(exit_aout_binfmt);
	331	MODULE_LICENSE("GPL");