[linux-2.6-block.git] / arch / x86 / boot / compressed / misc.c

/*
 * misc.c
 *
 * This is a collection of several routines from gzip-1.0.3
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
 */

/*
 * we have to be careful, because no indirections are allowed here, and
 * paravirt_ops is a kind of one. As it will only run in baremetal anyway,
 * we just keep it from happening
 */
#undef CONFIG_PARAVIRT
#ifdef CONFIG_X86_32
#define _ASM_X86_DESC_H 1
#endif

#ifdef CONFIG_X86_64
#define _LINUX_STRING_H_ 1
#define __LINUX_BITMAP_H 1
#endif

#include <linux/linkage.h>
#include <linux/screen_info.h>
#include <linux/elf.h>
#include <linux/io.h>
#include <asm/page.h>
#include <asm/boot.h>
#include <asm/bootparam.h>

/* WARNING!!
 * This code is compiled with -fPIC and it is relocated dynamically
 * at run time, but no relocation processing is performed.
 * This means that it is not safe to place pointers in static structures.
 */

/*
 * Getting to provable safe in place decompression is hard.
 * Worst case behaviours need to be analyzed.
 * Background information:
 *
 * The file layout is:
 *    magic[2]
 *    method[1]
 *    flags[1]
 *    timestamp[4]
 *    extraflags[1]
 *    os[1]
 *    compressed data blocks[N]
 *    crc[4] orig_len[4]
 *
 * resulting in 18 bytes of non compressed data overhead.
 *
 * Files divided into blocks
 * 1 bit (last block flag)
 * 2 bits (block type)
 *
 * 1 block occurs every 32K -1 bytes or when there 50% compression
 * has been achieved. The smallest block type encoding is always used.
 *
 * stored:
 *    32 bits length in bytes.
 *
 * fixed:
 *    magic fixed tree.
 *    symbols.
 *
 * dynamic:
 *    dynamic tree encoding.
 *    symbols.
 *
 *
 * The buffer for decompression in place is the length of the
 * uncompressed data, plus a small amount extra to keep the algorithm safe.
 * The compressed data is placed at the end of the buffer.  The output
 * pointer is placed at the start of the buffer and the input pointer
 * is placed where the compressed data starts.  Problems will occur
 * when the output pointer overruns the input pointer.
 *
 * The output pointer can only overrun the input pointer if the input
 * pointer is moving faster than the output pointer.  A condition only
 * triggered by data whose compressed form is larger than the uncompressed
 * form.
 *
 * The worst case at the block level is a growth of the compressed data
 * of 5 bytes per 32767 bytes.
 *
 * The worst case internal to a compressed block is very hard to figure.
 * The worst case can at least be boundined by having one bit that represents
 * 32764 bytes and then all of the rest of the bytes representing the very
 * very last byte.
 *
 * All of which is enough to compute an amount of extra data that is required
 * to be safe.  To avoid problems at the block level allocating 5 extra bytes
 * per 32767 bytes of data is sufficient.  To avoind problems internal to a
 * block adding an extra 32767 bytes (the worst case uncompressed block size)
 * is sufficient, to ensure that in the worst case the decompressed data for
 * block will stop the byte before the compressed data for a block begins.
 * To avoid problems with the compressed data's meta information an extra 18
 * bytes are needed.  Leading to the formula:
 *
 * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
 *
 * Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
 * Adding 32768 instead of 32767 just makes for round numbers.
 * Adding the decompressor_size is necessary as it musht live after all
 * of the data as well.  Last I measured the decompressor is about 14K.
 * 10K of actual data and 4K of bss.
 *
 */

/*
 * gzip declarations
 */
#define STATIC		static

#undef memset
#undef memcpy
#define memzero(s, n)	memset((s), 0, (n))


static void error(char *m);

/*
 * This is set up by the setup-routine at boot-time
 */
static struct boot_params *real_mode;		/* Pointer to real-mode data */
static int quiet;

static void *memset(void *s, int c, unsigned n);
void *memcpy(void *dest, const void *src, unsigned n);

static void __putstr(int, const char *);
#define putstr(__x)  __putstr(0, __x)

#ifdef CONFIG_X86_64
#define memptr long
#else
#define memptr unsigned
#endif

static memptr free_mem_ptr;
static memptr free_mem_end_ptr;

static char *vidmem;
static int vidport;
static int lines, cols;

#ifdef CONFIG_KERNEL_GZIP
#include "../../../../lib/decompress_inflate.c"
#endif

#ifdef CONFIG_KERNEL_BZIP2
#include "../../../../lib/decompress_bunzip2.c"
#endif

#ifdef CONFIG_KERNEL_LZMA
#include "../../../../lib/decompress_unlzma.c"
#endif

#ifdef CONFIG_KERNEL_LZO
#include "../../../../lib/decompress_unlzo.c"
#endif

static void scroll(void)
{
	int i;

	memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
	for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
		vidmem[i] = ' ';
}

static void __putstr(int error, const char *s)
{
	int x, y, pos;
	char c;

#ifndef CONFIG_X86_VERBOSE_BOOTUP
	if (!error)
		return;
#endif

#ifdef CONFIG_X86_32
	if (real_mode->screen_info.orig_video_mode == 0 &&
	    lines == 0 && cols == 0)
		return;
#endif

	x = real_mode->screen_info.orig_x;
	y = real_mode->screen_info.orig_y;

	while ((c = *s++) != '\0') {
		if (c == '\n') {
			x = 0;
			if (++y >= lines) {
				scroll();
				y--;
			}
		} else {
			vidmem[(x + cols * y) * 2] = c;
			if (++x >= cols) {
				x = 0;
				if (++y >= lines) {
					scroll();
					y--;
				}
			}
		}
	}

	real_mode->screen_info.orig_x = x;
	real_mode->screen_info.orig_y = y;

	pos = (x + cols * y) * 2;	/* Update cursor position */
	outb(14, vidport);
	outb(0xff & (pos >> 9), vidport+1);
	outb(15, vidport);
	outb(0xff & (pos >> 1), vidport+1);
}

static void *memset(void *s, int c, unsigned n)
{
	int i;
	char *ss = s;

	for (i = 0; i < n; i++)
		ss[i] = c;
	return s;
}

void *memcpy(void *dest, const void *src, unsigned n)
{
	int i;
	const char *s = src;
	char *d = dest;

	for (i = 0; i < n; i++)
		d[i] = s[i];
	return dest;
}


static void error(char *x)
{
	__putstr(1, "\n\n");
	__putstr(1, x);
	__putstr(1, "\n\n -- System halted");

	while (1)
		asm("hlt");
}

static void parse_elf(void *output)
{
#ifdef CONFIG_X86_64
	Elf64_Ehdr ehdr;
	Elf64_Phdr *phdrs, *phdr;
#else
	Elf32_Ehdr ehdr;
	Elf32_Phdr *phdrs, *phdr;
#endif
	void *dest;
	int i;

	memcpy(&ehdr, output, sizeof(ehdr));
	if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
	   ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
	   ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
	   ehdr.e_ident[EI_MAG3] != ELFMAG3) {
		error("Kernel is not a valid ELF file");
		return;
	}

	if (!quiet)
		putstr("Parsing ELF... ");

	phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
	if (!phdrs)
		error("Failed to allocate space for phdrs");

	memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);

	for (i = 0; i < ehdr.e_phnum; i++) {
		phdr = &phdrs[i];

		switch (phdr->p_type) {
		case PT_LOAD:
#ifdef CONFIG_RELOCATABLE
			dest = output;
			dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
#else
			dest = (void *)(phdr->p_paddr);
#endif
			memcpy(dest,
			       output + phdr->p_offset,
			       phdr->p_filesz);
			break;
		default: /* Ignore other PT_* */ break;
		}
	}
}

asmlinkage void decompress_kernel(void *rmode, memptr heap,
				  unsigned char *input_data,
				  unsigned long input_len,
				  unsigned char *output)
{
	real_mode = rmode;

	if (real_mode->hdr.loadflags & QUIET_FLAG)
		quiet = 1;

	if (real_mode->screen_info.orig_video_mode == 7) {
		vidmem = (char *) 0xb0000;
		vidport = 0x3b4;
	} else {
		vidmem = (char *) 0xb8000;
		vidport = 0x3d4;
	}

	lines = real_mode->screen_info.orig_video_lines;
	cols = real_mode->screen_info.orig_video_cols;

	free_mem_ptr     = heap;	/* Heap */
	free_mem_end_ptr = heap + BOOT_HEAP_SIZE;

	if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
		error("Destination address inappropriately aligned");
#ifdef CONFIG_X86_64
	if (heap > 0x3fffffffffffUL)
		error("Destination address too large");
#else
	if (heap > ((-__PAGE_OFFSET-(512<<20)-1) & 0x7fffffff))
		error("Destination address too large");
#endif
#ifndef CONFIG_RELOCATABLE
	if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
		error("Wrong destination address");
#endif

	if (!quiet)
		putstr("\nDecompressing Linux... ");
	decompress(input_data, input_len, NULL, NULL, output, NULL, error);
	parse_elf(output);
	if (!quiet)
		putstr("done.\nBooting the kernel.\n");
	return;
}
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* misc.c
818a08f8 IC	3	*
818a08f8 IC	4	* This is a collection of several routines from gzip-1.0.3
1da177e4 LT	5	* adapted for Linux.
	6	*
	7	* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
	8	* puts by Nick Holloway 1993, better puts by Martin Mares 1995
	9	* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
	10	*/
	11
818a08f8 IC	12	/*
	13	* we have to be careful, because no indirections are allowed here, and
	14	* paravirt_ops is a kind of one. As it will only run in baremetal anyway,
	15	* we just keep it from happening
	16	*/
d3561b7f	17	#undef CONFIG_PARAVIRT
099e1377	18	#ifdef CONFIG_X86_32
1965aae3	19	#define _ASM_X86_DESC_H 1
099e1377 IC	20	#endif
099e1377 IC	21
778cb929 IC	22	#ifdef CONFIG_X86_64
	23	#define _LINUX_STRING_H_ 1
	24	#define __LINUX_BITMAP_H 1
	25	#endif
	26
1da177e4	27	#include <linux/linkage.h>
7e7f358c	28	#include <linux/screen_info.h>
099e1377	29	#include <linux/elf.h>
020878ac	30	#include <linux/io.h>
968de4f0	31	#include <asm/page.h>
e69f202d	32	#include <asm/boot.h>
23968f71	33	#include <asm/bootparam.h>
968de4f0 EB	34
	35	/* WARNING!!
	36	* This code is compiled with -fPIC and it is relocated dynamically
	37	* at run time, but no relocation processing is performed.
	38	* This means that it is not safe to place pointers in static structures.
	39	*/
	40
	41	/*
	42	* Getting to provable safe in place decompression is hard.
27b46d76	43	* Worst case behaviours need to be analyzed.
968de4f0 EB	44	* Background information:
	45	*
	46	* The file layout is:
	47	* magic[2]
	48	* method[1]
	49	* flags[1]
	50	* timestamp[4]
	51	* extraflags[1]
	52	* os[1]
	53	* compressed data blocks[N]
	54	* crc[4] orig_len[4]
	55	*
	56	* resulting in 18 bytes of non compressed data overhead.
	57	*
	58	* Files divided into blocks
	59	* 1 bit (last block flag)
	60	* 2 bits (block type)
	61	*
1180e01d IM	62	* 1 block occurs every 32K -1 bytes or when there 50% compression
1180e01d IM	63	* has been achieved. The smallest block type encoding is always used.
968de4f0 EB	64	*
	65	* stored:
	66	* 32 bits length in bytes.
	67	*
	68	* fixed:
	69	* magic fixed tree.
	70	* symbols.
	71	*
	72	* dynamic:
	73	* dynamic tree encoding.
	74	* symbols.
	75	*
	76	*
	77	* The buffer for decompression in place is the length of the
	78	* uncompressed data, plus a small amount extra to keep the algorithm safe.
	79	* The compressed data is placed at the end of the buffer. The output
	80	* pointer is placed at the start of the buffer and the input pointer
	81	* is placed where the compressed data starts. Problems will occur
	82	* when the output pointer overruns the input pointer.
	83	*
	84	* The output pointer can only overrun the input pointer if the input
	85	* pointer is moving faster than the output pointer. A condition only
	86	* triggered by data whose compressed form is larger than the uncompressed
	87	* form.
	88	*
	89	* The worst case at the block level is a growth of the compressed data
	90	* of 5 bytes per 32767 bytes.
	91	*
	92	* The worst case internal to a compressed block is very hard to figure.
	93	* The worst case can at least be boundined by having one bit that represents
	94	* 32764 bytes and then all of the rest of the bytes representing the very
	95	* very last byte.
	96	*
	97	* All of which is enough to compute an amount of extra data that is required
	98	* to be safe. To avoid problems at the block level allocating 5 extra bytes
1180e01d IM	99	* per 32767 bytes of data is sufficient. To avoind problems internal to a
	100	* block adding an extra 32767 bytes (the worst case uncompressed block size)
	101	* is sufficient, to ensure that in the worst case the decompressed data for
968de4f0 EB	102	* block will stop the byte before the compressed data for a block begins.
	103	* To avoid problems with the compressed data's meta information an extra 18
	104	* bytes are needed. Leading to the formula:
	105	*
	106	* extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
	107	*
	108	* Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
	109	* Adding 32768 instead of 32767 just makes for round numbers.
	110	* Adding the decompressor_size is necessary as it musht live after all
	111	* of the data as well. Last I measured the decompressor is about 14K.
27b46d76	112	* 10K of actual data and 4K of bss.
968de4f0 EB	113	*
968de4f0 EB	114	*/
1da177e4 LT	115
	116	/*
	117	* gzip declarations
	118	*/
1180e01d	119	#define STATIC static
1da177e4 LT	120
	121	#undef memset
	122	#undef memcpy
1180e01d	123	#define memzero(s, n) memset((s), 0, (n))
1da177e4	124
1da177e4	125
1da177e4	126	static void error(char *m);
fd77c7ca	127
1da177e4 LT	128	/*
	129	* This is set up by the setup-routine at boot-time
	130	*/
23968f71	131	static struct boot_params real_mode; / Pointer to real-mode data */
3b6b9293	132	static int quiet;
1da177e4	133
b79c4df7	134	static void memset(void s, int c, unsigned n);
ae03c499	135	void memcpy(void dest, const void *src, unsigned n);
b79c4df7	136
6bcb13b3 BC	137	static void __putstr(int, const char *);
6bcb13b3 BC	138	#define putstr(__x) __putstr(0, __x)
1da177e4	139
778cb929 IC	140	#ifdef CONFIG_X86_64
	141	#define memptr long
	142	#else
	143	#define memptr unsigned
	144	#endif
	145
	146	static memptr free_mem_ptr;
	147	static memptr free_mem_end_ptr;
1da177e4	148
03056c88	149	static char *vidmem;
1da177e4 LT	150	static int vidport;
	151	static int lines, cols;
	152
ae03c499 AK	153	#ifdef CONFIG_KERNEL_GZIP
	154	#include "../../../../lib/decompress_inflate.c"
	155	#endif
	156
	157	#ifdef CONFIG_KERNEL_BZIP2
	158	#include "../../../../lib/decompress_bunzip2.c"
	159	#endif
	160
	161	#ifdef CONFIG_KERNEL_LZMA
	162	#include "../../../../lib/decompress_unlzma.c"
	163	#endif
1da177e4	164
13510997 AT	165	#ifdef CONFIG_KERNEL_LZO
	166	#include "../../../../lib/decompress_unlzo.c"
	167	#endif
	168
1da177e4 LT	169	static void scroll(void)
	170	{
	171	int i;
	172
fd77c7ca PC	173	memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
fd77c7ca PC	174	for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
1da177e4 LT	175	vidmem[i] = ' ';
	176	}
	177
6bcb13b3	178	static void __putstr(int error, const char *s)
1da177e4	179	{
fd77c7ca	180	int x, y, pos;
1da177e4 LT	181	char c;
1da177e4 LT	182
6bcb13b3 BC	183	#ifndef CONFIG_X86_VERBOSE_BOOTUP
	184	if (!error)
	185	return;
	186	#endif
	187
778cb929	188	#ifdef CONFIG_X86_32
23968f71 KH	189	if (real_mode->screen_info.orig_video_mode == 0 &&
23968f71 KH	190	lines == 0 && cols == 0)
a24e7851	191	return;
778cb929	192	#endif
a24e7851	193
23968f71 KH	194	x = real_mode->screen_info.orig_x;
23968f71 KH	195	y = real_mode->screen_info.orig_y;
1da177e4	196
fd77c7ca PC	197	while ((c = *s++) != '\0') {
fd77c7ca PC	198	if (c == '\n') {
1da177e4	199	x = 0;
fd77c7ca	200	if (++y >= lines) {
1da177e4 LT	201	scroll();
	202	y--;
	203	}
	204	} else {
020878ac	205	vidmem[(x + cols * y) * 2] = c;
fd77c7ca	206	if (++x >= cols) {
1da177e4	207	x = 0;
fd77c7ca	208	if (++y >= lines) {
1da177e4 LT	209	scroll();
	210	y--;
	211	}
	212	}
	213	}
	214	}
	215
23968f71 KH	216	real_mode->screen_info.orig_x = x;
23968f71 KH	217	real_mode->screen_info.orig_y = y;
1da177e4 LT	218
1da177e4 LT	219	pos = (x + cols * y) * 2; /* Update cursor position */
b02aae9c RH	220	outb(14, vidport);
	221	outb(0xff & (pos >> 9), vidport+1);
	222	outb(15, vidport);
	223	outb(0xff & (pos >> 1), vidport+1);
1da177e4 LT	224	}
1da177e4 LT	225
fd77c7ca	226	static void memset(void s, int c, unsigned n)
1da177e4 LT	227	{
1da177e4 LT	228	int i;
ade1af77	229	char *ss = s;
1da177e4	230
020878ac PC	231	for (i = 0; i < n; i++)
020878ac PC	232	ss[i] = c;
1da177e4 LT	233	return s;
	234	}
	235
ae03c499	236	void memcpy(void dest, const void *src, unsigned n)
1da177e4 LT	237	{
1da177e4 LT	238	int i;
ade1af77 JE	239	const char *s = src;
ade1af77 JE	240	char *d = dest;
1da177e4	241
020878ac PC	242	for (i = 0; i < n; i++)
020878ac PC	243	d[i] = s[i];
b79c4df7	244	return dest;
1da177e4 LT	245	}
1da177e4 LT	246
1da177e4 LT	247
	248	static void error(char *x)
	249	{
6bcb13b3 BC	250	__putstr(1, "\n\n");
	251	__putstr(1, x);
	252	__putstr(1, "\n\n -- System halted");
1da177e4	253
ff3cf856 IM	254	while (1)
ff3cf856 IM	255	asm("hlt");
1da177e4 LT	256	}
1da177e4 LT	257
099e1377 IC	258	static void parse_elf(void *output)
	259	{
	260	#ifdef CONFIG_X86_64
	261	Elf64_Ehdr ehdr;
	262	Elf64_Phdr phdrs, phdr;
	263	#else
	264	Elf32_Ehdr ehdr;
	265	Elf32_Phdr phdrs, phdr;
	266	#endif
	267	void *dest;
	268	int i;
	269
	270	memcpy(&ehdr, output, sizeof(ehdr));
fd77c7ca	271	if (ehdr.e_ident[EI_MAG0] != ELFMAG0 \|\|
099e1377 IC	272	ehdr.e_ident[EI_MAG1] != ELFMAG1 \|\|
099e1377 IC	273	ehdr.e_ident[EI_MAG2] != ELFMAG2 \|\|
fd77c7ca	274	ehdr.e_ident[EI_MAG3] != ELFMAG3) {
099e1377 IC	275	error("Kernel is not a valid ELF file");
	276	return;
	277	}
	278
3b6b9293 KH	279	if (!quiet)
3b6b9293 KH	280	putstr("Parsing ELF... ");
099e1377 IC	281
	282	phdrs = malloc(sizeof(phdrs) ehdr.e_phnum);
	283	if (!phdrs)
	284	error("Failed to allocate space for phdrs");
	285
	286	memcpy(phdrs, output + ehdr.e_phoff, sizeof(phdrs) ehdr.e_phnum);
	287
fd77c7ca	288	for (i = 0; i < ehdr.e_phnum; i++) {
099e1377 IC	289	phdr = &phdrs[i];
	290
	291	switch (phdr->p_type) {
	292	case PT_LOAD:
	293	#ifdef CONFIG_RELOCATABLE
	294	dest = output;
	295	dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
	296	#else
fd77c7ca	297	dest = (void *)(phdr->p_paddr);
099e1377 IC	298	#endif
	299	memcpy(dest,
	300	output + phdr->p_offset,
	301	phdr->p_filesz);
	302	break;
	303	default: /* Ignore other PT_* */ break;
	304	}
	305	}
	306	}
	307
778cb929	308	asmlinkage void decompress_kernel(void *rmode, memptr heap,
1180e01d IM	309	unsigned char *input_data,
	310	unsigned long input_len,
	311	unsigned char *output)
1da177e4 LT	312	{
	313	real_mode = rmode;
	314
3b6b9293 KH	315	if (real_mode->hdr.loadflags & QUIET_FLAG)
	316	quiet = 1;
	317
23968f71	318	if (real_mode->screen_info.orig_video_mode == 7) {
1da177e4 LT	319	vidmem = (char *) 0xb0000;
	320	vidport = 0x3b4;
	321	} else {
	322	vidmem = (char *) 0xb8000;
	323	vidport = 0x3d4;
	324	}
	325
23968f71 KH	326	lines = real_mode->screen_info.orig_video_lines;
23968f71 KH	327	cols = real_mode->screen_info.orig_video_cols;
1da177e4	328
4c83d653	329	free_mem_ptr = heap; /* Heap */
7c539764	330	free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
968de4f0	331
7ed42a28 PA	332	if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
7ed42a28 PA	333	error("Destination address inappropriately aligned");
778cb929	334	#ifdef CONFIG_X86_64
7ed42a28	335	if (heap > 0x3fffffffffffUL)
778cb929 IC	336	error("Destination address too large");
778cb929 IC	337	#else
4c83d653	338	if (heap > ((-__PAGE_OFFSET-(512<<20)-1) & 0x7fffffff))
968de4f0	339	error("Destination address too large");
7ed42a28	340	#endif
968de4f0	341	#ifndef CONFIG_RELOCATABLE
7ed42a28	342	if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
968de4f0 EB	343	error("Wrong destination address");
968de4f0 EB	344	#endif
1da177e4	345
3b6b9293 KH	346	if (!quiet)
3b6b9293 KH	347	putstr("\nDecompressing Linux... ");
ae03c499	348	decompress(input_data, input_len, NULL, NULL, output, NULL, error);
099e1377	349	parse_elf(output);
3b6b9293 KH	350	if (!quiet)
3b6b9293 KH	351	putstr("done.\nBooting the kernel.\n");
968de4f0	352	return;
1da177e4	353	}