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

// SPDX-License-Identifier: GPL-2.0
/*
 * misc.c
 *
 * This is a collection of several routines used to extract the kernel
 * which includes KASLR relocation, decompression, ELF parsing, and
 * relocation processing. Additionally included are the screen and serial
 * output functions and related debugging support functions.
 *
 * 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
 */

#include "misc.h"
#include "error.h"
#include "pgtable.h"
#include "../string.h"
#include "../voffset.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.
 */

/* Macros used by the included decompressor code below. */
#define STATIC		static

/*
 * Use normal definitions of mem*() from string.c. There are already
 * included header files which expect a definition of memset() and by
 * the time we define memset macro, it is too late.
 */
#undef memcpy
#undef memset
#define memzero(s, n)	memset((s), 0, (n))
#define memmove		memmove

/* Functions used by the included decompressor code below. */
void *memmove(void *dest, const void *src, size_t n);

/*
 * This is set up by the setup-routine at boot-time
 */
struct boot_params *boot_params;

memptr free_mem_ptr;
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_XZ
#include "../../../../lib/decompress_unxz.c"
#endif

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

#ifdef CONFIG_KERNEL_LZ4
#include "../../../../lib/decompress_unlz4.c"
#endif
/*
 * NOTE: When adding a new decompressor, please update the analysis in
 * ../header.S.
 */

static void scroll(void)
{
	int i;

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

#define XMTRDY          0x20

#define TXR             0       /*  Transmit register (WRITE) */
#define LSR             5       /*  Line Status               */
static void serial_putchar(int ch)
{
	unsigned timeout = 0xffff;

	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
		cpu_relax();

	outb(ch, early_serial_base + TXR);
}

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

	if (early_serial_base) {
		const char *str = s;
		while (*str) {
			if (*str == '\n')
				serial_putchar('\r');
			serial_putchar(*str++);
		}
	}

	if (lines == 0 || cols == 0)
		return;

	x = boot_params->screen_info.orig_x;
	y = boot_params->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--;
				}
			}
		}
	}

	boot_params->screen_info.orig_x = x;
	boot_params->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);
}

void __puthex(unsigned long value)
{
	char alpha[2] = "0";
	int bits;

	for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
		unsigned long digit = (value >> bits) & 0xf;

		if (digit < 0xA)
			alpha[0] = '0' + digit;
		else
			alpha[0] = 'a' + (digit - 0xA);

		__putstr(alpha);
	}
}

#if CONFIG_X86_NEED_RELOCS
static void handle_relocations(void *output, unsigned long output_len,
			       unsigned long virt_addr)
{
	int *reloc;
	unsigned long delta, map, ptr;
	unsigned long min_addr = (unsigned long)output;
	unsigned long max_addr = min_addr + (VO___bss_start - VO__text);

	/*
	 * Calculate the delta between where vmlinux was linked to load
	 * and where it was actually loaded.
	 */
	delta = min_addr - LOAD_PHYSICAL_ADDR;

	/*
	 * The kernel contains a table of relocation addresses. Those
	 * addresses have the final load address of the kernel in virtual
	 * memory. We are currently working in the self map. So we need to
	 * create an adjustment for kernel memory addresses to the self map.
	 * This will involve subtracting out the base address of the kernel.
	 */
	map = delta - __START_KERNEL_map;

	/*
	 * 32-bit always performs relocations. 64-bit relocations are only
	 * needed if KASLR has chosen a different starting address offset
	 * from __START_KERNEL_map.
	 */
	if (IS_ENABLED(CONFIG_X86_64))
		delta = virt_addr - LOAD_PHYSICAL_ADDR;

	if (!delta) {
		debug_putstr("No relocation needed... ");
		return;
	}
	debug_putstr("Performing relocations... ");

	/*
	 * Process relocations: 32 bit relocations first then 64 bit after.
	 * Three sets of binary relocations are added to the end of the kernel
	 * before compression. Each relocation table entry is the kernel
	 * address of the location which needs to be updated stored as a
	 * 32-bit value which is sign extended to 64 bits.
	 *
	 * Format is:
	 *
	 * kernel bits...
	 * 0 - zero terminator for 64 bit relocations
	 * 64 bit relocation repeated
	 * 0 - zero terminator for inverse 32 bit relocations
	 * 32 bit inverse relocation repeated
	 * 0 - zero terminator for 32 bit relocations
	 * 32 bit relocation repeated
	 *
	 * So we work backwards from the end of the decompressed image.
	 */
	for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
		long extended = *reloc;
		extended += map;

		ptr = (unsigned long)extended;
		if (ptr < min_addr || ptr > max_addr)
			error("32-bit relocation outside of kernel!\n");

		*(uint32_t *)ptr += delta;
	}
#ifdef CONFIG_X86_64
	while (*--reloc) {
		long extended = *reloc;
		extended += map;

		ptr = (unsigned long)extended;
		if (ptr < min_addr || ptr > max_addr)
			error("inverse 32-bit relocation outside of kernel!\n");

		*(int32_t *)ptr -= delta;
	}
	for (reloc--; *reloc; reloc--) {
		long extended = *reloc;
		extended += map;

		ptr = (unsigned long)extended;
		if (ptr < min_addr || ptr > max_addr)
			error("64-bit relocation outside of kernel!\n");

		*(uint64_t *)ptr += delta;
	}
#endif
}
#else
static inline void handle_relocations(void *output, unsigned long output_len,
				      unsigned long virt_addr)
{ }
#endif

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;
	}

	debug_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_X86_64
			if ((phdr->p_align % 0x200000) != 0)
				error("Alignment of LOAD segment isn't multiple of 2MB");
#endif
#ifdef CONFIG_RELOCATABLE
			dest = output;
			dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
#else
			dest = (void *)(phdr->p_paddr);
#endif
			memmove(dest, output + phdr->p_offset, phdr->p_filesz);
			break;
		default: /* Ignore other PT_* */ break;
		}
	}

	free(phdrs);
}

/*
 * The compressed kernel image (ZO), has been moved so that its position
 * is against the end of the buffer used to hold the uncompressed kernel
 * image (VO) and the execution environment (.bss, .brk), which makes sure
 * there is room to do the in-place decompression. (See header.S for the
 * calculations.)
 *
 *                             |-----compressed kernel image------|
 *                             V                                  V
 * 0                       extract_offset                      +INIT_SIZE
 * |-----------|---------------|-------------------------|--------|
 *             |               |                         |        |
 *           VO__text      startup_32 of ZO          VO__end    ZO__end
 *             ^                                         ^
 *             |-------uncompressed kernel image---------|
 *
 */
asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
				  unsigned char *input_data,
				  unsigned long input_len,
				  unsigned char *output,
				  unsigned long output_len)
{
	const unsigned long kernel_total_size = VO__end - VO__text;
	unsigned long virt_addr = LOAD_PHYSICAL_ADDR;

	/* Retain x86 boot parameters pointer passed from startup_32/64. */
	boot_params = rmode;

	/* Clear flags intended for solely in-kernel use. */
	boot_params->hdr.loadflags &= ~KASLR_FLAG;

	sanitize_boot_params(boot_params);

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

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

	console_init();
	debug_putstr("early console in extract_kernel\n");

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

	/* Report initial kernel position details. */
	debug_putaddr(input_data);
	debug_putaddr(input_len);
	debug_putaddr(output);
	debug_putaddr(output_len);
	debug_putaddr(kernel_total_size);

#ifdef CONFIG_X86_64
	/* Report address of 32-bit trampoline */
	debug_putaddr(trampoline_32bit);
#endif

	/*
	 * The memory hole needed for the kernel is the larger of either
	 * the entire decompressed kernel plus relocation table, or the
	 * entire decompressed kernel plus .bss and .brk sections.
	 */
	choose_random_location((unsigned long)input_data, input_len,
				(unsigned long *)&output,
				max(output_len, kernel_total_size),
				&virt_addr);

	/* Validate memory location choices. */
	if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
		error("Destination physical address inappropriately aligned");
	if (virt_addr & (MIN_KERNEL_ALIGN - 1))
		error("Destination virtual address inappropriately aligned");
#ifdef CONFIG_X86_64
	if (heap > 0x3fffffffffffUL)
		error("Destination address too large");
	if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE)
		error("Destination virtual address is beyond the kernel mapping area");
#else
	if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
		error("Destination address too large");
#endif
#ifndef CONFIG_RELOCATABLE
	if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
		error("Destination address does not match LOAD_PHYSICAL_ADDR");
	if (virt_addr != LOAD_PHYSICAL_ADDR)
		error("Destination virtual address changed when not relocatable");
#endif

	debug_putstr("\nDecompressing Linux... ");
	__decompress(input_data, input_len, NULL, NULL, output, output_len,
			NULL, error);
	parse_elf(output);
	handle_relocations(output, output_len, virt_addr);
	debug_putstr("done.\nBooting the kernel.\n");
	return output;
}

void fortify_panic(const char *name)
{
	error("detected buffer overflow");
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
1da177e4 LT	3	* misc.c
818a08f8	4	*
c0402881 KC	5	* This is a collection of several routines used to extract the kernel
	6	* which includes KASLR relocation, decompression, ELF parsing, and
	7	* relocation processing. Additionally included are the screen and serial
	8	* output functions and related debugging support functions.
1da177e4 LT	9	*
	10	* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
	11	* puts by Nick Holloway 1993, better puts by Martin Mares 1995
	12	* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
	13	*/
	14
8fee13a4	15	#include "misc.h"
dc425a6e	16	#include "error.h"
3548e131	17	#include "pgtable.h"
820e8fec	18	#include "../string.h"
67b66625	19	#include "../voffset.h"
968de4f0	20
968de4f0	21	/*
4252db10 BH	22	* WARNING!!
	23	* This code is compiled with -fPIC and it is relocated dynamically at
	24	* run time, but no relocation processing is performed. This means that
	25	* it is not safe to place pointers in static structures.
968de4f0	26	*/
1da177e4	27
1f208de3	28	/* Macros used by the included decompressor code below. */
1180e01d	29	#define STATIC static
1da177e4	30
04999550	31	/*
1f208de3	32	* Use normal definitions of mem*() from string.c. There are already
04999550 VG	33	* included header files which expect a definition of memset() and by
	34	* the time we define memset macro, it is too late.
	35	*/
1f208de3	36	#undef memcpy
04999550	37	#undef memset
1180e01d	38	#define memzero(s, n) memset((s), 0, (n))
81b785f3	39	#define memmove memmove
1da177e4	40
1f208de3	41	/* Functions used by the included decompressor code below. */
81b785f3	42	void memmove(void dest, const void *src, size_t n);
fd77c7ca	43
1da177e4 LT	44	/*
	45	* This is set up by the setup-routine at boot-time
	46	*/
6655e0aa	47	struct boot_params *boot_params;
1da177e4	48
82fa9637 KC	49	memptr free_mem_ptr;
82fa9637 KC	50	memptr free_mem_end_ptr;
1da177e4	51
03056c88	52	static char *vidmem;
1da177e4 LT	53	static int vidport;
	54	static int lines, cols;
	55
ae03c499 AK	56	#ifdef CONFIG_KERNEL_GZIP
	57	#include "../../../../lib/decompress_inflate.c"
	58	#endif
	59
	60	#ifdef CONFIG_KERNEL_BZIP2
	61	#include "../../../../lib/decompress_bunzip2.c"
	62	#endif
	63
	64	#ifdef CONFIG_KERNEL_LZMA
	65	#include "../../../../lib/decompress_unlzma.c"
	66	#endif
1da177e4	67
30314804 LC	68	#ifdef CONFIG_KERNEL_XZ
	69	#include "../../../../lib/decompress_unxz.c"
	70	#endif
	71
13510997 AT	72	#ifdef CONFIG_KERNEL_LZO
	73	#include "../../../../lib/decompress_unlzo.c"
	74	#endif
	75
f9b493ac KL	76	#ifdef CONFIG_KERNEL_LZ4
	77	#include "../../../../lib/decompress_unlz4.c"
	78	#endif
4252db10 BH	79	/*
	80	* NOTE: When adding a new decompressor, please update the analysis in
	81	* ../header.S.
	82	*/
f9b493ac	83
1da177e4 LT	84	static void scroll(void)
	85	{
	86	int i;
	87
81b785f3	88	memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
fd77c7ca	89	for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
1da177e4 LT	90	vidmem[i] = ' ';
	91	}
	92
8fee13a4 YL	93	#define XMTRDY 0x20
	94
	95	#define TXR 0 /* Transmit register (WRITE) */
	96	#define LSR 5 /* Line Status */
	97	static void serial_putchar(int ch)
	98	{
	99	unsigned timeout = 0xffff;
	100
	101	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
	102	cpu_relax();
	103
	104	outb(ch, early_serial_base + TXR);
	105	}
	106
7aac3015	107	void __putstr(const char *s)
1da177e4	108	{
fd77c7ca	109	int x, y, pos;
1da177e4 LT	110	char c;
1da177e4 LT	111
8fee13a4 YL	112	if (early_serial_base) {
	113	const char *str = s;
	114	while (*str) {
	115	if (*str == '\n')
	116	serial_putchar('\r');
	117	serial_putchar(*str++);
	118	}
	119	}
6bcb13b3	120
fb1cc2f9	121	if (lines == 0 \|\| cols == 0)
a24e7851 RR	122	return;
a24e7851 RR	123
6655e0aa KC	124	x = boot_params->screen_info.orig_x;
6655e0aa KC	125	y = boot_params->screen_info.orig_y;
1da177e4	126
fd77c7ca PC	127	while ((c = *s++) != '\0') {
fd77c7ca PC	128	if (c == '\n') {
1da177e4	129	x = 0;
fd77c7ca	130	if (++y >= lines) {
1da177e4 LT	131	scroll();
	132	y--;
	133	}
	134	} else {
020878ac	135	vidmem[(x + cols * y) * 2] = c;
fd77c7ca	136	if (++x >= cols) {
1da177e4	137	x = 0;
fd77c7ca	138	if (++y >= lines) {
1da177e4 LT	139	scroll();
	140	y--;
	141	}
	142	}
	143	}
	144	}
	145
6655e0aa KC	146	boot_params->screen_info.orig_x = x;
6655e0aa KC	147	boot_params->screen_info.orig_y = y;
1da177e4 LT	148
1da177e4 LT	149	pos = (x + cols * y) * 2; /* Update cursor position */
b02aae9c RH	150	outb(14, vidport);
	151	outb(0xff & (pos >> 9), vidport+1);
	152	outb(15, vidport);
	153	outb(0xff & (pos >> 1), vidport+1);
1da177e4 LT	154	}
1da177e4 LT	155
79063a7c KC	156	void __puthex(unsigned long value)
	157	{
	158	char alpha[2] = "0";
	159	int bits;
	160
	161	for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
	162	unsigned long digit = (value >> bits) & 0xf;
	163
	164	if (digit < 0xA)
	165	alpha[0] = '0' + digit;
	166	else
	167	alpha[0] = 'a' + (digit - 0xA);
	168
	169	__putstr(alpha);
	170	}
	171	}
	172
a0215061	173	#if CONFIG_X86_NEED_RELOCS
8391c73c BH	174	static void handle_relocations(void *output, unsigned long output_len,
8391c73c BH	175	unsigned long virt_addr)
a0215061 KC	176	{
	177	int *reloc;
	178	unsigned long delta, map, ptr;
	179	unsigned long min_addr = (unsigned long)output;
4abf061b	180	unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
a0215061 KC	181
	182	/*
	183	* Calculate the delta between where vmlinux was linked to load
	184	* and where it was actually loaded.
	185	*/
	186	delta = min_addr - LOAD_PHYSICAL_ADDR;
a0215061 KC	187
	188	/*
	189	* The kernel contains a table of relocation addresses. Those
	190	* addresses have the final load address of the kernel in virtual
	191	* memory. We are currently working in the self map. So we need to
	192	* create an adjustment for kernel memory addresses to the self map.
	193	* This will involve subtracting out the base address of the kernel.
	194	*/
	195	map = delta - __START_KERNEL_map;
	196
8391c73c BH	197	/*
	198	* 32-bit always performs relocations. 64-bit relocations are only
	199	* needed if KASLR has chosen a different starting address offset
	200	* from __START_KERNEL_map.
	201	*/
	202	if (IS_ENABLED(CONFIG_X86_64))
	203	delta = virt_addr - LOAD_PHYSICAL_ADDR;
	204
	205	if (!delta) {
	206	debug_putstr("No relocation needed... ");
	207	return;
	208	}
	209	debug_putstr("Performing relocations... ");
	210
a0215061 KC	211	/*
a0215061 KC	212	* Process relocations: 32 bit relocations first then 64 bit after.
6d24c5f7	213	* Three sets of binary relocations are added to the end of the kernel
a0215061 KC	214	* before compression. Each relocation table entry is the kernel
	215	* address of the location which needs to be updated stored as a
	216	* 32-bit value which is sign extended to 64 bits.
	217	*
	218	* Format is:
	219	*
	220	* kernel bits...
	221	* 0 - zero terminator for 64 bit relocations
	222	* 64 bit relocation repeated
6d24c5f7 JB	223	* 0 - zero terminator for inverse 32 bit relocations
6d24c5f7 JB	224	* 32 bit inverse relocation repeated
a0215061 KC	225	* 0 - zero terminator for 32 bit relocations
	226	* 32 bit relocation repeated
	227	*
	228	* So we work backwards from the end of the decompressed image.
	229	*/
	230	for (reloc = output + output_len - sizeof(reloc); reloc; reloc--) {
6f9af75f	231	long extended = *reloc;
a0215061 KC	232	extended += map;
	233
	234	ptr = (unsigned long)extended;
	235	if (ptr < min_addr \|\| ptr > max_addr)
	236	error("32-bit relocation outside of kernel!\n");
	237
	238	(uint32_t )ptr += delta;
	239	}
	240	#ifdef CONFIG_X86_64
6d24c5f7 JB	241	while (*--reloc) {
	242	long extended = *reloc;
	243	extended += map;
	244
	245	ptr = (unsigned long)extended;
	246	if (ptr < min_addr \|\| ptr > max_addr)
	247	error("inverse 32-bit relocation outside of kernel!\n");
	248
	249	(int32_t )ptr -= delta;
	250	}
a0215061 KC	251	for (reloc--; *reloc; reloc--) {
	252	long extended = *reloc;
	253	extended += map;
	254
	255	ptr = (unsigned long)extended;
	256	if (ptr < min_addr \|\| ptr > max_addr)
	257	error("64-bit relocation outside of kernel!\n");
	258
	259	(uint64_t )ptr += delta;
	260	}
	261	#endif
	262	}
	263	#else
8391c73c BH	264	static inline void handle_relocations(void *output, unsigned long output_len,
8391c73c BH	265	unsigned long virt_addr)
a0215061 KC	266	{ }
	267	#endif
	268
099e1377 IC	269	static void parse_elf(void *output)
	270	{
	271	#ifdef CONFIG_X86_64
	272	Elf64_Ehdr ehdr;
	273	Elf64_Phdr phdrs, phdr;
	274	#else
	275	Elf32_Ehdr ehdr;
	276	Elf32_Phdr phdrs, phdr;
	277	#endif
	278	void *dest;
	279	int i;
	280
	281	memcpy(&ehdr, output, sizeof(ehdr));
fd77c7ca	282	if (ehdr.e_ident[EI_MAG0] != ELFMAG0 \|\|
099e1377 IC	283	ehdr.e_ident[EI_MAG1] != ELFMAG1 \|\|
099e1377 IC	284	ehdr.e_ident[EI_MAG2] != ELFMAG2 \|\|
fd77c7ca	285	ehdr.e_ident[EI_MAG3] != ELFMAG3) {
099e1377 IC	286	error("Kernel is not a valid ELF file");
	287	return;
	288	}
	289
e605a425	290	debug_putstr("Parsing ELF... ");
099e1377 IC	291
	292	phdrs = malloc(sizeof(phdrs) ehdr.e_phnum);
	293	if (!phdrs)
	294	error("Failed to allocate space for phdrs");
	295
	296	memcpy(phdrs, output + ehdr.e_phoff, sizeof(phdrs) ehdr.e_phnum);
	297
fd77c7ca	298	for (i = 0; i < ehdr.e_phnum; i++) {
099e1377 IC	299	phdr = &phdrs[i];
	300
	301	switch (phdr->p_type) {
	302	case PT_LOAD:
c55b8550 L	303	#ifdef CONFIG_X86_64
	304	if ((phdr->p_align % 0x200000) != 0)
	305	error("Alignment of LOAD segment isn't multiple of 2MB");
	306	#endif
099e1377 IC	307	#ifdef CONFIG_RELOCATABLE
	308	dest = output;
	309	dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
	310	#else
fd77c7ca	311	dest = (void *)(phdr->p_paddr);
099e1377	312	#endif
81b785f3	313	memmove(dest, output + phdr->p_offset, phdr->p_filesz);
099e1377 IC	314	break;
	315	default: /* Ignore other PT_* */ break;
	316	}
	317	}
5067cf53 JJ	318
5067cf53 JJ	319	free(phdrs);
099e1377 IC	320	}
099e1377 IC	321
974f221c YL	322	/*
	323	* The compressed kernel image (ZO), has been moved so that its position
	324	* is against the end of the buffer used to hold the uncompressed kernel
	325	* image (VO) and the execution environment (.bss, .brk), which makes sure
	326	* there is room to do the in-place decompression. (See header.S for the
	327	* calculations.)
	328	*
	329	* \|-----compressed kernel image------\|
	330	* V V
	331	* 0 extract_offset +INIT_SIZE
	332	* \|-----------\|---------------\|-------------------------\|--------\|
	333	* \| \| \| \|
	334	* VO__text startup_32 of ZO VO__end ZO__end
	335	* ^ ^
	336	* \|-------uncompressed kernel image---------\|
	337	*
	338	*/
c0402881	339	asmlinkage __visible void extract_kernel(void rmode, memptr heap,
1180e01d IM	340	unsigned char *input_data,
1180e01d IM	341	unsigned long input_len,
a0215061	342	unsigned char *output,
4d2d5424	343	unsigned long output_len)
1da177e4	344	{
4d2d5424	345	const unsigned long kernel_total_size = VO__end - VO__text;
8eabf42a	346	unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
f285f4a2	347
6655e0aa KC	348	/* Retain x86 boot parameters pointer passed from startup_32/64. */
6655e0aa KC	349	boot_params = rmode;
1da177e4	350
6655e0aa KC	351	/* Clear flags intended for solely in-kernel use. */
6655e0aa KC	352	boot_params->hdr.loadflags &= ~KASLR_FLAG;
78cac48c	353
6655e0aa	354	sanitize_boot_params(boot_params);
5dcd14ec	355
6655e0aa	356	if (boot_params->screen_info.orig_video_mode == 7) {
1da177e4 LT	357	vidmem = (char *) 0xb0000;
	358	vidport = 0x3b4;
	359	} else {
	360	vidmem = (char *) 0xb8000;
	361	vidport = 0x3d4;
	362	}
	363
6655e0aa KC	364	lines = boot_params->screen_info.orig_video_lines;
6655e0aa KC	365	cols = boot_params->screen_info.orig_video_cols;
1da177e4	366
8fee13a4	367	console_init();
c0402881	368	debug_putstr("early console in extract_kernel\n");
8fee13a4	369
4c83d653	370	free_mem_ptr = heap; /* Heap */
7c539764	371	free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
968de4f0	372
79063a7c KC	373	/* Report initial kernel position details. */
	374	debug_putaddr(input_data);
	375	debug_putaddr(input_len);
	376	debug_putaddr(output);
	377	debug_putaddr(output_len);
4d2d5424	378	debug_putaddr(kernel_total_size);
79063a7c	379
3548e131 KS	380	#ifdef CONFIG_X86_64
	381	/* Report address of 32-bit trampoline */
	382	debug_putaddr(trampoline_32bit);
	383	#endif
	384
e6023367 JM	385	/*
	386	* The memory hole needed for the kernel is the larger of either
	387	* the entire decompressed kernel plus relocation table, or the
	388	* entire decompressed kernel plus .bss and .brk sections.
	389	*/
8391c73c BH	390	choose_random_location((unsigned long)input_data, input_len,
	391	(unsigned long *)&output,
	392	max(output_len, kernel_total_size),
	393	&virt_addr);
8ab3820f KC	394
8ab3820f KC	395	/* Validate memory location choices. */
7ed42a28	396	if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
8391c73c BH	397	error("Destination physical address inappropriately aligned");
	398	if (virt_addr & (MIN_KERNEL_ALIGN - 1))
	399	error("Destination virtual address inappropriately aligned");
778cb929	400	#ifdef CONFIG_X86_64
7ed42a28	401	if (heap > 0x3fffffffffffUL)
778cb929	402	error("Destination address too large");
b892cb87 BH	403	if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE)
b892cb87 BH	404	error("Destination virtual address is beyond the kernel mapping area");
778cb929	405	#else
147dd561	406	if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
968de4f0	407	error("Destination address too large");
7ed42a28	408	#endif
968de4f0	409	#ifndef CONFIG_RELOCATABLE
7ed42a28	410	if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
8391c73c	411	error("Destination address does not match LOAD_PHYSICAL_ADDR");
8eabf42a	412	if (virt_addr != LOAD_PHYSICAL_ADDR)
8391c73c	413	error("Destination virtual address changed when not relocatable");
968de4f0	414	#endif
1da177e4	415
e605a425	416	debug_putstr("\nDecompressing Linux... ");
2d3862d2 YL	417	__decompress(input_data, input_len, NULL, NULL, output, output_len,
2d3862d2 YL	418	NULL, error);
099e1377	419	parse_elf(output);
8391c73c	420	handle_relocations(output, output_len, virt_addr);
e605a425	421	debug_putstr("done.\nBooting the kernel.\n");
8ab3820f	422	return output;
1da177e4	423	}
6974f0c4 DM	424
	425	void fortify_panic(const char *name)
	426	{
	427	error("detected buffer overflow");
	428	}