[linux.git] / fs / binfmt_som.c

/*
 * linux/fs/binfmt_som.c
 *
 * These are the functions used to load SOM format executables as used
 * by HP-UX.  
 *
 * Copyright 1999 Matthew Wilcox <[email protected]>
 * based on binfmt_elf which is
 * Copyright 1993, 1994: Eric Youngdale ([email protected]).
 */

#include <linux/module.h>

#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/binfmts.h>
#include <linux/som.h>
#include <linux/string.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/shm.h>
#include <linux/personality.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>


#include <linux/elf.h>

static int load_som_binary(struct linux_binprm * bprm);
static int load_som_library(struct file *);

/*
 * If we don't support core dumping, then supply a NULL so we
 * don't even try.
 */
#if 0
static int som_core_dump(struct coredump_params *cprm);
#else
#define som_core_dump	NULL
#endif

#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))

static struct linux_binfmt som_format = {
	.module		= THIS_MODULE,
	.load_binary	= load_som_binary,
	.load_shlib	= load_som_library,
	.core_dump	= som_core_dump,
	.min_coredump	= SOM_PAGESIZE
};

/*
 * create_som_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 void create_som_tables(struct linux_binprm *bprm)
{
	char **argv, **envp;
	int argc = bprm->argc;
	int envc = bprm->envc;
	unsigned long p;
	unsigned long *sp;

	/* Word-align the stack pointer */
	sp = (unsigned long *)((bprm->p + 3) & ~3);

	envp = (char **) sp;
	sp += envc + 1;
	argv = (char **) sp;
	sp += argc + 1;

	__put_user((unsigned long) envp,++sp);
	__put_user((unsigned long) argv,++sp);

	__put_user(argc, ++sp);

	bprm->p = (unsigned long) sp;

	p = current->mm->arg_start;
	while (argc-- > 0) {
		__put_user((char *)p,argv++);
		p += strlen_user((char *)p);
	}
	__put_user(NULL, argv);
	current->mm->arg_end = current->mm->env_start = p;
	while (envc-- > 0) {
		__put_user((char *)p,envp++);
		p += strlen_user((char *)p);
	}
	__put_user(NULL, envp);
	current->mm->env_end = p;
}

static int check_som_header(struct som_hdr *som_ex)
{
	int *buf = (int *)som_ex;
	int i, ck;

	if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
	    som_ex->system_id != SOM_SID_PARISC_1_1 &&
	    som_ex->system_id != SOM_SID_PARISC_2_0)
		return -ENOEXEC;

	if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
	    som_ex->a_magic != SOM_EXEC_SHARE &&
	    som_ex->a_magic != SOM_EXEC_DEMAND)
		return -ENOEXEC;

	if (som_ex->version_id != SOM_ID_OLD &&
	    som_ex->version_id != SOM_ID_NEW)
		return -ENOEXEC;

	ck = 0;
	for (i=0; i<32; i++)
		ck ^= buf[i];
	if (ck != 0)
		return -ENOEXEC;

	return 0;
}

static int map_som_binary(struct file *file,
		const struct som_exec_auxhdr *hpuxhdr)
{
	unsigned long code_start, code_size, data_start, data_size;
	unsigned long bss_start, som_brk;
	int retval;
	int prot = PROT_READ | PROT_EXEC;
	int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;

	mm_segment_t old_fs = get_fs();
	set_fs(get_ds());

	code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
	code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
	current->mm->start_code = code_start;
	current->mm->end_code = code_start + code_size;
	retval = vm_mmap(file, code_start, code_size, prot,
			flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
	if (retval < 0 && retval > -1024)
		goto out;

	data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
	data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
	current->mm->start_data = data_start;
	current->mm->end_data = bss_start = data_start + data_size;
	retval = vm_mmap(file, data_start, data_size,
			prot | PROT_WRITE, flags,
			SOM_PAGESTART(hpuxhdr->exec_dfile));
	if (retval < 0 && retval > -1024)
		goto out;

	som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
	current->mm->start_brk = current->mm->brk = som_brk;
	retval = vm_mmap(NULL, bss_start, som_brk - bss_start,
			prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
	if (retval > 0 || retval < -1024)
		retval = 0;
out:
	set_fs(old_fs);
	return retval;
}


/*
 * These are the functions used to load SOM executables and shared
 * libraries.  There is no binary dependent code anywhere else.
 */

static int
load_som_binary(struct linux_binprm * bprm)
{
	int retval;
	unsigned int size;
	unsigned long som_entry;
	struct som_hdr *som_ex;
	struct som_exec_auxhdr *hpuxhdr;
	struct pt_regs *regs = current_pt_regs();

	/* Get the exec-header */
	som_ex = (struct som_hdr *) bprm->buf;

	retval = check_som_header(som_ex);
	if (retval != 0)
		goto out;

	/* Now read in the auxiliary header information */

	retval = -ENOMEM;
	size = som_ex->aux_header_size;
	if (size > SOM_PAGESIZE)
		goto out;
	hpuxhdr = kmalloc(size, GFP_KERNEL);
	if (!hpuxhdr)
		goto out;

	retval = kernel_read(bprm->file, som_ex->aux_header_location,
			(char *) hpuxhdr, size);
	if (retval != size) {
		if (retval >= 0)
			retval = -EIO;
		goto out_free;
	}

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

	/* OK, This is the point of no return */
	current->personality = PER_HPUX;
	setup_new_exec(bprm);

	/* Set the task size for HP-UX processes such that
	 * the gateway page is outside the address space.
	 * This can be fixed later, but for now, this is much
	 * easier.
	 */

	current->thread.task_size = 0xc0000000;

	/* Set map base to allow enough room for hp-ux heap growth */

	current->thread.map_base = 0x80000000;

	retval = map_som_binary(bprm->file, hpuxhdr);
	if (retval < 0)
		goto out_free;

	som_entry = hpuxhdr->exec_entry;
	kfree(hpuxhdr);

	set_binfmt(&som_format);
	install_exec_creds(bprm);
	setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);

	create_som_tables(bprm);

	current->mm->start_stack = bprm->p;

#if 0
	printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
	printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
	printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
	printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
	printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
	printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
#endif

	map_hpux_gateway_page(current,current->mm);

	start_thread_som(regs, som_entry, bprm->p);
	return 0;

	/* error cleanup */
out_free:
	kfree(hpuxhdr);
out:
	return retval;
}

static int load_som_library(struct file *f)
{
/* No lib support in SOM yet.  gizza chance.. */
	return -ENOEXEC;
}
	/* Install the SOM loader.
	 * N.B. We *rely* on the table being the right size with the
	 * right number of free slots...
	 */

static int __init init_som_binfmt(void)
{
	register_binfmt(&som_format);
	return 0;
}

static void __exit exit_som_binfmt(void)
{
	/* Remove the SOM loader. */
	unregister_binfmt(&som_format);
}

core_initcall(init_som_binfmt);
module_exit(exit_som_binfmt);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/binfmt_som.c
	3	*
	4	* These are the functions used to load SOM format executables as used
	5	* by HP-UX.
	6	*
	7	* Copyright 1999 Matthew Wilcox <[email protected]>
	8	* based on binfmt_elf which is
	9	* Copyright 1993, 1994: Eric Youngdale ([email protected]).
	10	*/
	11
	12	#include <linux/module.h>
	13
	14	#include <linux/fs.h>
	15	#include <linux/stat.h>
	16	#include <linux/sched.h>
	17	#include <linux/mm.h>
	18	#include <linux/mman.h>
	19	#include <linux/errno.h>
	20	#include <linux/signal.h>
	21	#include <linux/binfmts.h>
	22	#include <linux/som.h>
	23	#include <linux/string.h>
	24	#include <linux/file.h>
	25	#include <linux/fcntl.h>
	26	#include <linux/ptrace.h>
	27	#include <linux/slab.h>
	28	#include <linux/shm.h>
	29	#include <linux/personality.h>
	30	#include <linux/init.h>
	31
	32	#include <asm/uaccess.h>
	33	#include <asm/pgtable.h>
	34
1da177e4 LT	35
	36	#include <linux/elf.h>
	37
71613c3b	38	static int load_som_binary(struct linux_binprm * bprm);
1da177e4 LT	39	static int load_som_library(struct file *);
	40
	41	/*
	42	* If we don't support core dumping, then supply a NULL so we
	43	* don't even try.
	44	*/
	45	#if 0
f6151dfe	46	static int som_core_dump(struct coredump_params *cprm);
1da177e4 LT	47	#else
	48	#define som_core_dump NULL
	49	#endif
	50
	51	#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
	52	#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
	53	#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
	54
	55	static struct linux_binfmt som_format = {
	56	.module = THIS_MODULE,
	57	.load_binary = load_som_binary,
	58	.load_shlib = load_som_library,
	59	.core_dump = som_core_dump,
	60	.min_coredump = SOM_PAGESIZE
	61	};
	62
	63	/*
	64	* create_som_tables() parses the env- and arg-strings in new user
	65	* memory and creates the pointer tables from them, and puts their
	66	* addresses on the "stack", returning the new stack pointer value.
	67	*/
	68	static void create_som_tables(struct linux_binprm *bprm)
	69	{
	70	char argv, envp;
	71	int argc = bprm->argc;
	72	int envc = bprm->envc;
	73	unsigned long p;
	74	unsigned long *sp;
	75
	76	/* Word-align the stack pointer */
	77	sp = (unsigned long *)((bprm->p + 3) & ~3);
	78
	79	envp = (char **) sp;
	80	sp += envc + 1;
	81	argv = (char **) sp;
	82	sp += argc + 1;
	83
	84	__put_user((unsigned long) envp,++sp);
	85	__put_user((unsigned long) argv,++sp);
	86
	87	__put_user(argc, ++sp);
	88
	89	bprm->p = (unsigned long) sp;
	90
	91	p = current->mm->arg_start;
	92	while (argc-- > 0) {
	93	__put_user((char *)p,argv++);
	94	p += strlen_user((char *)p);
	95	}
	96	__put_user(NULL, argv);
	97	current->mm->arg_end = current->mm->env_start = p;
	98	while (envc-- > 0) {
	99	__put_user((char *)p,envp++);
	100	p += strlen_user((char *)p);
	101	}
	102	__put_user(NULL, envp);
	103	current->mm->env_end = p;
	104	}
	105
	106	static int check_som_header(struct som_hdr *som_ex)
	107	{
	108	int buf = (int )som_ex;
	109	int i, ck;
	110
111	if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
112	som_ex->system_id != SOM_SID_PARISC_1_1 &&
113	som_ex->system_id != SOM_SID_PARISC_2_0)
114	return -ENOEXEC;
115
116	if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
117	som_ex->a_magic != SOM_EXEC_SHARE &&
118	som_ex->a_magic != SOM_EXEC_DEMAND)
119	return -ENOEXEC;
120
121	if (som_ex->version_id != SOM_ID_OLD &&
122	som_ex->version_id != SOM_ID_NEW)
123	return -ENOEXEC;
124
125	ck = 0;
126	for (i=0; i<32; i++)
127	ck ^= buf[i];
128	if (ck != 0)
129	return -ENOEXEC;
130
131	return 0;
132	}
133
134	static int map_som_binary(struct file *file,
135	const struct som_exec_auxhdr *hpuxhdr)
136	{
137	unsigned long code_start, code_size, data_start, data_size;
138	unsigned long bss_start, som_brk;
139	int retval;
140	int prot = PROT_READ \| PROT_EXEC;
141	int flags = MAP_FIXED\|MAP_PRIVATE\|MAP_DENYWRITE\|MAP_EXECUTABLE;
142
143	mm_segment_t old_fs = get_fs();
144	set_fs(get_ds());
145
146	code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
147	code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
148	current->mm->start_code = code_start;
149	current->mm->end_code = code_start + code_size;
6be5ceb0	150	retval = vm_mmap(file, code_start, code_size, prot,
1da177e4	151	flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
1da177e4 LT	152	if (retval < 0 && retval > -1024)
	153	goto out;
	154
	155	data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
	156	data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
	157	current->mm->start_data = data_start;
	158	current->mm->end_data = bss_start = data_start + data_size;
6be5ceb0	159	retval = vm_mmap(file, data_start, data_size,
1da177e4 LT	160	prot \| PROT_WRITE, flags,
1da177e4 LT	161	SOM_PAGESTART(hpuxhdr->exec_dfile));
1da177e4 LT	162	if (retval < 0 && retval > -1024)
	163	goto out;
	164
	165	som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
	166	current->mm->start_brk = current->mm->brk = som_brk;
6be5ceb0	167	retval = vm_mmap(NULL, bss_start, som_brk - bss_start,
1da177e4	168	prot \| PROT_WRITE, MAP_FIXED \| MAP_PRIVATE, 0);
1da177e4 LT	169	if (retval > 0 \|\| retval < -1024)
	170	retval = 0;
	171	out:
	172	set_fs(old_fs);
	173	return retval;
	174	}
	175
	176
	177	/*
	178	* These are the functions used to load SOM executables and shared
	179	* libraries. There is no binary dependent code anywhere else.
	180	*/
	181
	182	static int
71613c3b	183	load_som_binary(struct linux_binprm * bprm)
1da177e4	184	{
1da177e4 LT	185	int retval;
	186	unsigned int size;
	187	unsigned long som_entry;
	188	struct som_hdr *som_ex;
	189	struct som_exec_auxhdr *hpuxhdr;
71613c3b	190	struct pt_regs *regs = current_pt_regs();
1da177e4 LT	191
	192	/* Get the exec-header */
	193	som_ex = (struct som_hdr *) bprm->buf;
	194
	195	retval = check_som_header(som_ex);
	196	if (retval != 0)
	197	goto out;
	198
	199	/* Now read in the auxiliary header information */
	200
	201	retval = -ENOMEM;
	202	size = som_ex->aux_header_size;
	203	if (size > SOM_PAGESIZE)
	204	goto out;
dc02747d	205	hpuxhdr = kmalloc(size, GFP_KERNEL);
1da177e4 LT	206	if (!hpuxhdr)
	207	goto out;
	208
	209	retval = kernel_read(bprm->file, som_ex->aux_header_location,
	210	(char *) hpuxhdr, size);
dc02747d MW	211	if (retval != size) {
	212	if (retval >= 0)
	213	retval = -EIO;
	214	goto out_free;
	215	}
	216
1da177e4 LT	217	/* Flush all traces of the currently running executable */
	218	retval = flush_old_exec(bprm);
	219	if (retval)
	220	goto out_free;
	221
	222	/* OK, This is the point of no return */
1da177e4	223	current->personality = PER_HPUX;
221af7f8	224	setup_new_exec(bprm);
1da177e4 LT	225
	226	/* Set the task size for HP-UX processes such that
	227	* the gateway page is outside the address space.
	228	* This can be fixed later, but for now, this is much
	229	* easier.
	230	*/
	231
	232	current->thread.task_size = 0xc0000000;
	233
	234	/* Set map base to allow enough room for hp-ux heap growth */
	235
	236	current->thread.map_base = 0x80000000;
	237
	238	retval = map_som_binary(bprm->file, hpuxhdr);
	239	if (retval < 0)
	240	goto out_free;
	241
	242	som_entry = hpuxhdr->exec_entry;
	243	kfree(hpuxhdr);
	244
	245	set_binfmt(&som_format);
a6f76f23	246	install_exec_creds(bprm);
1da177e4 LT	247	setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
	248
	249	create_som_tables(bprm);
	250
	251	current->mm->start_stack = bprm->p;
1da177e4 LT	252
	253	#if 0
	254	printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
	255	printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
	256	printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
	257	printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
	258	printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
	259	printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
	260	#endif
	261
	262	map_hpux_gateway_page(current,current->mm);
	263
	264	start_thread_som(regs, som_entry, bprm->p);
1da177e4 LT	265	return 0;
	266
	267	/* error cleanup */
	268	out_free:
	269	kfree(hpuxhdr);
	270	out:
	271	return retval;
	272	}
	273
	274	static int load_som_library(struct file *f)
	275	{
	276	/* No lib support in SOM yet. gizza chance.. */
	277	return -ENOEXEC;
	278	}
	279	/* Install the SOM loader.
	280	* N.B. We rely on the table being the right size with the
	281	* right number of free slots...
	282	*/
	283
	284	static int __init init_som_binfmt(void)
	285	{
8fc3dc5a AV	286	register_binfmt(&som_format);
8fc3dc5a AV	287	return 0;
1da177e4 LT	288	}
	289
	290	static void __exit exit_som_binfmt(void)
	291	{
	292	/* Remove the SOM loader. */
	293	unregister_binfmt(&som_format);
	294	}
	295
	296	core_initcall(init_som_binfmt);
	297	module_exit(exit_som_binfmt);
cde162c2 AB	298
cde162c2 AB	299	MODULE_LICENSE("GPL");