[linux-2.6-block.git] / arch / x86 / mm / dump_pagetables.c

/*
 * Debug helper to dump the current kernel pagetables of the system
 * so that we can see what the various memory ranges are set to.
 *
 * (C) Copyright 2008 Intel Corporation
 *
 * Author: Arjan van de Ven <arjan@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */

#include <linux/debugfs.h>
#include <linux/kasan.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/seq_file.h>

#include <asm/pgtable.h>

/*
 * The dumper groups pagetable entries of the same type into one, and for
 * that it needs to keep some state when walking, and flush this state
 * when a "break" in the continuity is found.
 */
struct pg_state {
	int level;
	pgprot_t current_prot;
	unsigned long start_address;
	unsigned long current_address;
	const struct addr_marker *marker;
	unsigned long lines;
	bool to_dmesg;
	bool check_wx;
	unsigned long wx_pages;
};

struct addr_marker {
	unsigned long start_address;
	const char *name;
	unsigned long max_lines;
};

/* Address space markers hints */

#ifdef CONFIG_X86_64

enum address_markers_idx {
	USER_SPACE_NR = 0,
	KERNEL_SPACE_NR,
	LOW_KERNEL_NR,
#if defined(CONFIG_MODIFY_LDT_SYSCALL) && defined(CONFIG_X86_5LEVEL)
	LDT_NR,
#endif
	VMALLOC_START_NR,
	VMEMMAP_START_NR,
#ifdef CONFIG_KASAN
	KASAN_SHADOW_START_NR,
	KASAN_SHADOW_END_NR,
#endif
#if defined(CONFIG_MODIFY_LDT_SYSCALL) && !defined(CONFIG_X86_5LEVEL)
	LDT_NR,
#endif
	CPU_ENTRY_AREA_NR,
#ifdef CONFIG_X86_ESPFIX64
	ESPFIX_START_NR,
#endif
#ifdef CONFIG_EFI
	EFI_END_NR,
#endif
	HIGH_KERNEL_NR,
	MODULES_VADDR_NR,
	MODULES_END_NR,
	FIXADDR_START_NR,
	END_OF_SPACE_NR,
};

static struct addr_marker address_markers[] = {
	[USER_SPACE_NR]		= { 0,			"User Space" },
	[KERNEL_SPACE_NR]	= { (1UL << 63),	"Kernel Space" },
	[LOW_KERNEL_NR]		= { 0UL,		"Low Kernel Mapping" },
	[VMALLOC_START_NR]	= { 0UL,		"vmalloc() Area" },
	[VMEMMAP_START_NR]	= { 0UL,		"Vmemmap" },
#ifdef CONFIG_KASAN
	[KASAN_SHADOW_START_NR]	= { KASAN_SHADOW_START,	"KASAN shadow" },
	[KASAN_SHADOW_END_NR]	= { KASAN_SHADOW_END,	"KASAN shadow end" },
#endif
#ifdef CONFIG_MODIFY_LDT_SYSCALL
	[LDT_NR]		= { LDT_BASE_ADDR,	"LDT remap" },
#endif
	[CPU_ENTRY_AREA_NR]	= { CPU_ENTRY_AREA_BASE,"CPU entry Area" },
#ifdef CONFIG_X86_ESPFIX64
	[ESPFIX_START_NR]	= { ESPFIX_BASE_ADDR,	"ESPfix Area", 16 },
#endif
#ifdef CONFIG_EFI
	[EFI_END_NR]		= { EFI_VA_END,		"EFI Runtime Services" },
#endif
	[HIGH_KERNEL_NR]	= { __START_KERNEL_map,	"High Kernel Mapping" },
	[MODULES_VADDR_NR]	= { MODULES_VADDR,	"Modules" },
	[MODULES_END_NR]	= { MODULES_END,	"End Modules" },
	[FIXADDR_START_NR]	= { FIXADDR_START,	"Fixmap Area" },
	[END_OF_SPACE_NR]	= { -1,			NULL }
};

#else /* CONFIG_X86_64 */

enum address_markers_idx {
	USER_SPACE_NR = 0,
	KERNEL_SPACE_NR,
	VMALLOC_START_NR,
	VMALLOC_END_NR,
#ifdef CONFIG_HIGHMEM
	PKMAP_BASE_NR,
#endif
	CPU_ENTRY_AREA_NR,
	FIXADDR_START_NR,
	END_OF_SPACE_NR,
};

static struct addr_marker address_markers[] = {
	[USER_SPACE_NR]		= { 0,			"User Space" },
	[KERNEL_SPACE_NR]	= { PAGE_OFFSET,	"Kernel Mapping" },
	[VMALLOC_START_NR]	= { 0UL,		"vmalloc() Area" },
	[VMALLOC_END_NR]	= { 0UL,		"vmalloc() End" },
#ifdef CONFIG_HIGHMEM
	[PKMAP_BASE_NR]		= { 0UL,		"Persistent kmap() Area" },
#endif
	[CPU_ENTRY_AREA_NR]	= { 0UL,		"CPU entry area" },
	[FIXADDR_START_NR]	= { 0UL,		"Fixmap area" },
	[END_OF_SPACE_NR]	= { -1,			NULL }
};

#endif /* !CONFIG_X86_64 */

/* Multipliers for offsets within the PTEs */
#define PTE_LEVEL_MULT (PAGE_SIZE)
#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
#define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)

#define pt_dump_seq_printf(m, to_dmesg, fmt, args...)		\
({								\
	if (to_dmesg)					\
		printk(KERN_INFO fmt, ##args);			\
	else							\
		if (m)						\
			seq_printf(m, fmt, ##args);		\
})

#define pt_dump_cont_printf(m, to_dmesg, fmt, args...)		\
({								\
	if (to_dmesg)					\
		printk(KERN_CONT fmt, ##args);			\
	else							\
		if (m)						\
			seq_printf(m, fmt, ##args);		\
})

/*
 * Print a readable form of a pgprot_t to the seq_file
 */
static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
{
	pgprotval_t pr = pgprot_val(prot);
	static const char * const level_name[] =
		{ "cr3", "pgd", "p4d", "pud", "pmd", "pte" };

	if (!(pr & _PAGE_PRESENT)) {
		/* Not present */
		pt_dump_cont_printf(m, dmsg, "                              ");
	} else {
		if (pr & _PAGE_USER)
			pt_dump_cont_printf(m, dmsg, "USR ");
		else
			pt_dump_cont_printf(m, dmsg, "    ");
		if (pr & _PAGE_RW)
			pt_dump_cont_printf(m, dmsg, "RW ");
		else
			pt_dump_cont_printf(m, dmsg, "ro ");
		if (pr & _PAGE_PWT)
			pt_dump_cont_printf(m, dmsg, "PWT ");
		else
			pt_dump_cont_printf(m, dmsg, "    ");
		if (pr & _PAGE_PCD)
			pt_dump_cont_printf(m, dmsg, "PCD ");
		else
			pt_dump_cont_printf(m, dmsg, "    ");

		/* Bit 7 has a different meaning on level 3 vs 4 */
		if (level <= 4 && pr & _PAGE_PSE)
			pt_dump_cont_printf(m, dmsg, "PSE ");
		else
			pt_dump_cont_printf(m, dmsg, "    ");
		if ((level == 5 && pr & _PAGE_PAT) ||
		    ((level == 4 || level == 3) && pr & _PAGE_PAT_LARGE))
			pt_dump_cont_printf(m, dmsg, "PAT ");
		else
			pt_dump_cont_printf(m, dmsg, "    ");
		if (pr & _PAGE_GLOBAL)
			pt_dump_cont_printf(m, dmsg, "GLB ");
		else
			pt_dump_cont_printf(m, dmsg, "    ");
		if (pr & _PAGE_NX)
			pt_dump_cont_printf(m, dmsg, "NX ");
		else
			pt_dump_cont_printf(m, dmsg, "x  ");
	}
	pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]);
}

/*
 * On 64 bits, sign-extend the 48 bit address to 64 bit
 */
static unsigned long normalize_addr(unsigned long u)
{
	int shift;
	if (!IS_ENABLED(CONFIG_X86_64))
		return u;

	shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
	return (signed long)(u << shift) >> shift;
}

/*
 * This function gets called on a break in a continuous series
 * of PTE entries; the next one is different so we need to
 * print what we collected so far.
 */
static void note_page(struct seq_file *m, struct pg_state *st,
		      pgprot_t new_prot, int level)
{
	pgprotval_t prot, cur;
	static const char units[] = "BKMGTPE";

	/*
	 * If we have a "break" in the series, we need to flush the state that
	 * we have now. "break" is either changing perms, levels or
	 * address space marker.
	 */
	prot = pgprot_val(new_prot);
	cur = pgprot_val(st->current_prot);

	if (!st->level) {
		/* First entry */
		st->current_prot = new_prot;
		st->level = level;
		st->marker = address_markers;
		st->lines = 0;
		pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
				   st->marker->name);
	} else if (prot != cur || level != st->level ||
		   st->current_address >= st->marker[1].start_address) {
		const char *unit = units;
		unsigned long delta;
		int width = sizeof(unsigned long) * 2;
		pgprotval_t pr = pgprot_val(st->current_prot);

		if (st->check_wx && (pr & _PAGE_RW) && !(pr & _PAGE_NX)) {
			WARN_ONCE(1,
				  "x86/mm: Found insecure W+X mapping at address %p/%pS\n",
				  (void *)st->start_address,
				  (void *)st->start_address);
			st->wx_pages += (st->current_address -
					 st->start_address) / PAGE_SIZE;
		}

		/*
		 * Now print the actual finished series
		 */
		if (!st->marker->max_lines ||
		    st->lines < st->marker->max_lines) {
			pt_dump_seq_printf(m, st->to_dmesg,
					   "0x%0*lx-0x%0*lx   ",
					   width, st->start_address,
					   width, st->current_address);

			delta = st->current_address - st->start_address;
			while (!(delta & 1023) && unit[1]) {
				delta >>= 10;
				unit++;
			}
			pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",
					    delta, *unit);
			printk_prot(m, st->current_prot, st->level,
				    st->to_dmesg);
		}
		st->lines++;

		/*
		 * We print markers for special areas of address space,
		 * such as the start of vmalloc space etc.
		 * This helps in the interpretation.
		 */
		if (st->current_address >= st->marker[1].start_address) {
			if (st->marker->max_lines &&
			    st->lines > st->marker->max_lines) {
				unsigned long nskip =
					st->lines - st->marker->max_lines;
				pt_dump_seq_printf(m, st->to_dmesg,
						   "... %lu entr%s skipped ... \n",
						   nskip,
						   nskip == 1 ? "y" : "ies");
			}
			st->marker++;
			st->lines = 0;
			pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
					   st->marker->name);
		}

		st->start_address = st->current_address;
		st->current_prot = new_prot;
		st->level = level;
	}
}

static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr, unsigned long P)
{
	int i;
	pte_t *start;
	pgprotval_t prot;

	start = (pte_t *)pmd_page_vaddr(addr);
	for (i = 0; i < PTRS_PER_PTE; i++) {
		prot = pte_flags(*start);
		st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
		note_page(m, st, __pgprot(prot), 5);
		start++;
	}
}
#ifdef CONFIG_KASAN

/*
 * This is an optimization for KASAN=y case. Since all kasan page tables
 * eventually point to the kasan_zero_page we could call note_page()
 * right away without walking through lower level page tables. This saves
 * us dozens of seconds (minutes for 5-level config) while checking for
 * W+X mapping or reading kernel_page_tables debugfs file.
 */
static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
				void *pt)
{
	if (__pa(pt) == __pa(kasan_zero_pmd) ||
#ifdef CONFIG_X86_5LEVEL
	    __pa(pt) == __pa(kasan_zero_p4d) ||
#endif
	    __pa(pt) == __pa(kasan_zero_pud)) {
		pgprotval_t prot = pte_flags(kasan_zero_pte[0]);
		note_page(m, st, __pgprot(prot), 5);
		return true;
	}
	return false;
}
#else
static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
				void *pt)
{
	return false;
}
#endif

#if PTRS_PER_PMD > 1

static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr, unsigned long P)
{
	int i;
	pmd_t *start, *pmd_start;
	pgprotval_t prot;

	pmd_start = start = (pmd_t *)pud_page_vaddr(addr);
	for (i = 0; i < PTRS_PER_PMD; i++) {
		st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
		if (!pmd_none(*start)) {
			if (pmd_large(*start) || !pmd_present(*start)) {
				prot = pmd_flags(*start);
				note_page(m, st, __pgprot(prot), 4);
			} else if (!kasan_page_table(m, st, pmd_start)) {
				walk_pte_level(m, st, *start,
					       P + i * PMD_LEVEL_MULT);
			}
		} else
			note_page(m, st, __pgprot(0), 4);
		start++;
	}
}

#else
#define walk_pmd_level(m,s,a,p) walk_pte_level(m,s,__pmd(pud_val(a)),p)
#define pud_large(a) pmd_large(__pmd(pud_val(a)))
#define pud_none(a)  pmd_none(__pmd(pud_val(a)))
#endif

#if PTRS_PER_PUD > 1

static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr, unsigned long P)
{
	int i;
	pud_t *start, *pud_start;
	pgprotval_t prot;
	pud_t *prev_pud = NULL;

	pud_start = start = (pud_t *)p4d_page_vaddr(addr);

	for (i = 0; i < PTRS_PER_PUD; i++) {
		st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
		if (!pud_none(*start)) {
			if (pud_large(*start) || !pud_present(*start)) {
				prot = pud_flags(*start);
				note_page(m, st, __pgprot(prot), 3);
			} else if (!kasan_page_table(m, st, pud_start)) {
				walk_pmd_level(m, st, *start,
					       P + i * PUD_LEVEL_MULT);
			}
		} else
			note_page(m, st, __pgprot(0), 3);

		prev_pud = start;
		start++;
	}
}

#else
#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(p4d_val(a)),p)
#define p4d_large(a) pud_large(__pud(p4d_val(a)))
#define p4d_none(a)  pud_none(__pud(p4d_val(a)))
#endif

#if PTRS_PER_P4D > 1

static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr, unsigned long P)
{
	int i;
	p4d_t *start, *p4d_start;
	pgprotval_t prot;

	p4d_start = start = (p4d_t *)pgd_page_vaddr(addr);

	for (i = 0; i < PTRS_PER_P4D; i++) {
		st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
		if (!p4d_none(*start)) {
			if (p4d_large(*start) || !p4d_present(*start)) {
				prot = p4d_flags(*start);
				note_page(m, st, __pgprot(prot), 2);
			} else if (!kasan_page_table(m, st, p4d_start)) {
				walk_pud_level(m, st, *start,
					       P + i * P4D_LEVEL_MULT);
			}
		} else
			note_page(m, st, __pgprot(0), 2);

		start++;
	}
}

#else
#define walk_p4d_level(m,s,a,p) walk_pud_level(m,s,__p4d(pgd_val(a)),p)
#define pgd_large(a) p4d_large(__p4d(pgd_val(a)))
#define pgd_none(a)  p4d_none(__p4d(pgd_val(a)))
#endif

static inline bool is_hypervisor_range(int idx)
{
#ifdef CONFIG_X86_64
	/*
	 * ffff800000000000 - ffff87ffffffffff is reserved for
	 * the hypervisor.
	 */
	return	(idx >= pgd_index(__PAGE_OFFSET) - 16) &&
		(idx <  pgd_index(__PAGE_OFFSET));
#else
	return false;
#endif
}

static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
				       bool checkwx, bool dmesg)
{
#ifdef CONFIG_X86_64
	pgd_t *start = (pgd_t *) &init_top_pgt;
#else
	pgd_t *start = swapper_pg_dir;
#endif
	pgprotval_t prot;
	int i;
	struct pg_state st = {};

	if (pgd) {
		start = pgd;
		st.to_dmesg = dmesg;
	}

	st.check_wx = checkwx;
	if (checkwx)
		st.wx_pages = 0;

	for (i = 0; i < PTRS_PER_PGD; i++) {
		st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
		if (!pgd_none(*start) && !is_hypervisor_range(i)) {
			if (pgd_large(*start) || !pgd_present(*start)) {
				prot = pgd_flags(*start);
				note_page(m, &st, __pgprot(prot), 1);
			} else {
				walk_p4d_level(m, &st, *start,
					       i * PGD_LEVEL_MULT);
			}
		} else
			note_page(m, &st, __pgprot(0), 1);

		cond_resched();
		start++;
	}

	/* Flush out the last page */
	st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
	note_page(m, &st, __pgprot(0), 0);
	if (!checkwx)
		return;
	if (st.wx_pages)
		pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
			st.wx_pages);
	else
		pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
}

void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
{
	ptdump_walk_pgd_level_core(m, pgd, false, true);
}

void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user)
{
#ifdef CONFIG_PAGE_TABLE_ISOLATION
	if (user && static_cpu_has(X86_FEATURE_PTI))
		pgd = kernel_to_user_pgdp(pgd);
#endif
	ptdump_walk_pgd_level_core(m, pgd, false, false);
}
EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs);

static void ptdump_walk_user_pgd_level_checkwx(void)
{
#ifdef CONFIG_PAGE_TABLE_ISOLATION
	pgd_t *pgd = (pgd_t *) &init_top_pgt;

	if (!static_cpu_has(X86_FEATURE_PTI))
		return;

	pr_info("x86/mm: Checking user space page tables\n");
	pgd = kernel_to_user_pgdp(pgd);
	ptdump_walk_pgd_level_core(NULL, pgd, true, false);
#endif
}

void ptdump_walk_pgd_level_checkwx(void)
{
	ptdump_walk_pgd_level_core(NULL, NULL, true, false);
	ptdump_walk_user_pgd_level_checkwx();
}

static int __init pt_dump_init(void)
{
	/*
	 * Various markers are not compile-time constants, so assign them
	 * here.
	 */
#ifdef CONFIG_X86_64
	address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET;
	address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
	address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
#endif
#ifdef CONFIG_X86_32
	address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
	address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
# ifdef CONFIG_HIGHMEM
	address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE;
# endif
	address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
	address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE;
#endif
	return 0;
}
__initcall(pt_dump_init);
Commit	Line	Data
926e5392 AV	1	/*
	2	* Debug helper to dump the current kernel pagetables of the system
	3	* so that we can see what the various memory ranges are set to.
	4	*
	5	* (C) Copyright 2008 Intel Corporation
	6	*
	7	* Author: Arjan van de Ven <arjan@linux.intel.com>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; version 2
	12	* of the License.
	13	*/
	14
fe770bf0	15	#include <linux/debugfs.h>
04b67022	16	#include <linux/kasan.h>
fe770bf0	17	#include <linux/mm.h>
84e629b6	18	#include <linux/init.h>
146fbb76	19	#include <linux/sched.h>
926e5392	20	#include <linux/seq_file.h>
926e5392 AV	21
	22	#include <asm/pgtable.h>
	23
	24	/*
	25	* The dumper groups pagetable entries of the same type into one, and for
	26	* that it needs to keep some state when walking, and flush this state
	27	* when a "break" in the continuity is found.
	28	*/
	29	struct pg_state {
	30	int level;
	31	pgprot_t current_prot;
	32	unsigned long start_address;
	33	unsigned long current_address;
fe770bf0	34	const struct addr_marker *marker;
3891a04a	35	unsigned long lines;
ef6bea6d	36	bool to_dmesg;
e1a58320 SS	37	bool check_wx;
e1a58320 SS	38	unsigned long wx_pages;
926e5392 AV	39	};
926e5392 AV	40
fe770bf0 PA	41	struct addr_marker {
	42	unsigned long start_address;
	43	const char *name;
3891a04a	44	unsigned long max_lines;
fe770bf0 PA	45	};
fe770bf0 PA	46
146122e2 TG	47	/* Address space markers hints */
	48
	49	#ifdef CONFIG_X86_64
	50
92851e2f AS	51	enum address_markers_idx {
92851e2f AS	52	USER_SPACE_NR = 0,
92851e2f AS	53	KERNEL_SPACE_NR,
92851e2f AS	54	LOW_KERNEL_NR,
f55f0501 AL	55	#if defined(CONFIG_MODIFY_LDT_SYSCALL) && defined(CONFIG_X86_5LEVEL)
	56	LDT_NR,
	57	#endif
92851e2f AS	58	VMALLOC_START_NR,
92851e2f AS	59	VMEMMAP_START_NR,
025205f8 AR	60	#ifdef CONFIG_KASAN
	61	KASAN_SHADOW_START_NR,
	62	KASAN_SHADOW_END_NR,
f55f0501 AL	63	#endif
	64	#if defined(CONFIG_MODIFY_LDT_SYSCALL) && !defined(CONFIG_X86_5LEVEL)
	65	LDT_NR,
025205f8	66	#endif
92a0f81d	67	CPU_ENTRY_AREA_NR,
146122e2	68	#ifdef CONFIG_X86_ESPFIX64
3891a04a	69	ESPFIX_START_NR,
146122e2 TG	70	#endif
	71	#ifdef CONFIG_EFI
	72	EFI_END_NR,
	73	#endif
92851e2f AS	74	HIGH_KERNEL_NR,
	75	MODULES_VADDR_NR,
	76	MODULES_END_NR,
146122e2 TG	77	FIXADDR_START_NR,
	78	END_OF_SPACE_NR,
	79	};
	80
	81	static struct addr_marker address_markers[] = {
	82	[USER_SPACE_NR] = { 0, "User Space" },
	83	[KERNEL_SPACE_NR] = { (1UL << 63), "Kernel Space" },
	84	[LOW_KERNEL_NR] = { 0UL, "Low Kernel Mapping" },
	85	[VMALLOC_START_NR] = { 0UL, "vmalloc() Area" },
	86	[VMEMMAP_START_NR] = { 0UL, "Vmemmap" },
	87	#ifdef CONFIG_KASAN
	88	[KASAN_SHADOW_START_NR] = { KASAN_SHADOW_START, "KASAN shadow" },
	89	[KASAN_SHADOW_END_NR] = { KASAN_SHADOW_END, "KASAN shadow end" },
f55f0501 AL	90	#endif
	91	#ifdef CONFIG_MODIFY_LDT_SYSCALL
	92	[LDT_NR] = { LDT_BASE_ADDR, "LDT remap" },
146122e2	93	#endif
92a0f81d	94	[CPU_ENTRY_AREA_NR] = { CPU_ENTRY_AREA_BASE,"CPU entry Area" },
146122e2 TG	95	#ifdef CONFIG_X86_ESPFIX64
	96	[ESPFIX_START_NR] = { ESPFIX_BASE_ADDR, "ESPfix Area", 16 },
	97	#endif
	98	#ifdef CONFIG_EFI
	99	[EFI_END_NR] = { EFI_VA_END, "EFI Runtime Services" },
	100	#endif
	101	[HIGH_KERNEL_NR] = { __START_KERNEL_map, "High Kernel Mapping" },
	102	[MODULES_VADDR_NR] = { MODULES_VADDR, "Modules" },
	103	[MODULES_END_NR] = { MODULES_END, "End Modules" },
	104	[FIXADDR_START_NR] = { FIXADDR_START, "Fixmap Area" },
	105	[END_OF_SPACE_NR] = { -1, NULL }
	106	};
	107
	108	#else /* CONFIG_X86_64 */
	109
	110	enum address_markers_idx {
	111	USER_SPACE_NR = 0,
92851e2f AS	112	KERNEL_SPACE_NR,
	113	VMALLOC_START_NR,
	114	VMALLOC_END_NR,
146122e2	115	#ifdef CONFIG_HIGHMEM
92851e2f	116	PKMAP_BASE_NR,
92851e2f	117	#endif
92a0f81d	118	CPU_ENTRY_AREA_NR,
146122e2 TG	119	FIXADDR_START_NR,
146122e2 TG	120	END_OF_SPACE_NR,
92851e2f AS	121	};
92851e2f AS	122
fe770bf0	123	static struct addr_marker address_markers[] = {
146122e2 TG	124	[USER_SPACE_NR] = { 0, "User Space" },
	125	[KERNEL_SPACE_NR] = { PAGE_OFFSET, "Kernel Mapping" },
	126	[VMALLOC_START_NR] = { 0UL, "vmalloc() Area" },
	127	[VMALLOC_END_NR] = { 0UL, "vmalloc() End" },
	128	#ifdef CONFIG_HIGHMEM
	129	[PKMAP_BASE_NR] = { 0UL, "Persistent kmap() Area" },
fe770bf0	130	#endif
92a0f81d	131	[CPU_ENTRY_AREA_NR] = { 0UL, "CPU entry area" },
146122e2 TG	132	[FIXADDR_START_NR] = { 0UL, "Fixmap area" },
146122e2 TG	133	[END_OF_SPACE_NR] = { -1, NULL }
fe770bf0	134	};
926e5392	135
146122e2 TG	136	#endif /* !CONFIG_X86_64 */
146122e2 TG	137
fe770bf0 PA	138	/* Multipliers for offsets within the PTEs */
	139	#define PTE_LEVEL_MULT (PAGE_SIZE)
	140	#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
	141	#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
fdd3d8ce	142	#define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
84bbabc3	143	#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
926e5392	144
ef6bea6d BP	145	#define pt_dump_seq_printf(m, to_dmesg, fmt, args...) \
	146	({ \
	147	if (to_dmesg) \
	148	printk(KERN_INFO fmt, ##args); \
	149	else \
	150	if (m) \
	151	seq_printf(m, fmt, ##args); \
	152	})
	153
	154	#define pt_dump_cont_printf(m, to_dmesg, fmt, args...) \
	155	({ \
	156	if (to_dmesg) \
	157	printk(KERN_CONT fmt, ##args); \
	158	else \
	159	if (m) \
	160	seq_printf(m, fmt, ##args); \
	161	})
	162
926e5392 AV	163	/*
	164	* Print a readable form of a pgprot_t to the seq_file
	165	*/
ef6bea6d	166	static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
926e5392	167	{
fe770bf0 PA	168	pgprotval_t pr = pgprot_val(prot);
fe770bf0 PA	169	static const char * const level_name[] =
45dcd209	170	{ "cr3", "pgd", "p4d", "pud", "pmd", "pte" };
fe770bf0	171
c0534494	172	if (!(pr & _PAGE_PRESENT)) {
fe770bf0	173	/* Not present */
f439c429	174	pt_dump_cont_printf(m, dmsg, " ");
fe770bf0 PA	175	} else {
fe770bf0 PA	176	if (pr & _PAGE_USER)
ef6bea6d	177	pt_dump_cont_printf(m, dmsg, "USR ");
926e5392	178	else
ef6bea6d	179	pt_dump_cont_printf(m, dmsg, " ");
fe770bf0	180	if (pr & _PAGE_RW)
ef6bea6d	181	pt_dump_cont_printf(m, dmsg, "RW ");
fe770bf0	182	else
ef6bea6d	183	pt_dump_cont_printf(m, dmsg, "ro ");
fe770bf0	184	if (pr & _PAGE_PWT)
ef6bea6d	185	pt_dump_cont_printf(m, dmsg, "PWT ");
fe770bf0	186	else
ef6bea6d	187	pt_dump_cont_printf(m, dmsg, " ");
fe770bf0	188	if (pr & _PAGE_PCD)
ef6bea6d	189	pt_dump_cont_printf(m, dmsg, "PCD ");
926e5392	190	else
ef6bea6d	191	pt_dump_cont_printf(m, dmsg, " ");
fe770bf0	192
f439c429	193	/* Bit 7 has a different meaning on level 3 vs 4 */
45dcd209	194	if (level <= 4 && pr & _PAGE_PSE)
f439c429 JG	195	pt_dump_cont_printf(m, dmsg, "PSE ");
	196	else
	197	pt_dump_cont_printf(m, dmsg, " ");
45dcd209 KS	198	if ((level == 5 && pr & _PAGE_PAT) \|\|
45dcd209 KS	199	((level == 4 \|\| level == 3) && pr & _PAGE_PAT_LARGE))
da25e628	200	pt_dump_cont_printf(m, dmsg, "PAT ");
f439c429 JG	201	else
f439c429 JG	202	pt_dump_cont_printf(m, dmsg, " ");
fe770bf0	203	if (pr & _PAGE_GLOBAL)
ef6bea6d	204	pt_dump_cont_printf(m, dmsg, "GLB ");
fe770bf0	205	else
ef6bea6d	206	pt_dump_cont_printf(m, dmsg, " ");
fe770bf0	207	if (pr & _PAGE_NX)
ef6bea6d	208	pt_dump_cont_printf(m, dmsg, "NX ");
fe770bf0	209	else
ef6bea6d	210	pt_dump_cont_printf(m, dmsg, "x ");
926e5392	211	}
ef6bea6d	212	pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]);
926e5392 AV	213	}
	214
	215	/*
fe770bf0	216	* On 64 bits, sign-extend the 48 bit address to 64 bit
926e5392	217	*/
fe770bf0	218	static unsigned long normalize_addr(unsigned long u)
926e5392	219	{
3a366f79 KS	220	int shift;
	221	if (!IS_ENABLED(CONFIG_X86_64))
	222	return u;
	223
	224	shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
	225	return (signed long)(u << shift) >> shift;
926e5392 AV	226	}
	227
	228	/*
	229	* This function gets called on a break in a continuous series
	230	* of PTE entries; the next one is different so we need to
	231	* print what we collected so far.
	232	*/
	233	static void note_page(struct seq_file m, struct pg_state st,
fe770bf0	234	pgprot_t new_prot, int level)
926e5392	235	{
fe770bf0	236	pgprotval_t prot, cur;
3891a04a	237	static const char units[] = "BKMGTPE";
926e5392 AV	238
	239	/*
	240	* If we have a "break" in the series, we need to flush the state that
fe770bf0 PA	241	* we have now. "break" is either changing perms, levels or
fe770bf0 PA	242	* address space marker.
926e5392	243	*/
da25e628 TK	244	prot = pgprot_val(new_prot);
da25e628 TK	245	cur = pgprot_val(st->current_prot);
926e5392	246
fe770bf0 PA	247	if (!st->level) {
	248	/* First entry */
	249	st->current_prot = new_prot;
	250	st->level = level;
	251	st->marker = address_markers;
3891a04a	252	st->lines = 0;
ef6bea6d BP	253	pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
ef6bea6d BP	254	st->marker->name);
fe770bf0 PA	255	} else if (prot != cur \|\| level != st->level \|\|
	256	st->current_address >= st->marker[1].start_address) {
	257	const char *unit = units;
926e5392	258	unsigned long delta;
6424fb38	259	int width = sizeof(unsigned long) * 2;
e1a58320 SS	260	pgprotval_t pr = pgprot_val(st->current_prot);
	261
	262	if (st->check_wx && (pr & _PAGE_RW) && !(pr & _PAGE_NX)) {
	263	WARN_ONCE(1,
	264	"x86/mm: Found insecure W+X mapping at address %p/%pS\n",
	265	(void *)st->start_address,
	266	(void *)st->start_address);
	267	st->wx_pages += (st->current_address -
	268	st->start_address) / PAGE_SIZE;
	269	}
926e5392	270
926e5392 AV	271	/*
	272	* Now print the actual finished series
	273	*/
3891a04a PA	274	if (!st->marker->max_lines \|\|
	275	st->lines < st->marker->max_lines) {
	276	pt_dump_seq_printf(m, st->to_dmesg,
	277	"0x%0lx-0x%0lx ",
	278	width, st->start_address,
	279	width, st->current_address);
926e5392	280
3891a04a PA	281	delta = st->current_address - st->start_address;
	282	while (!(delta & 1023) && unit[1]) {
	283	delta >>= 10;
	284	unit++;
	285	}
	286	pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",
	287	delta, *unit);
	288	printk_prot(m, st->current_prot, st->level,
	289	st->to_dmesg);
926e5392	290	}
3891a04a	291	st->lines++;
fe770bf0 PA	292
	293	/*
	294	* We print markers for special areas of address space,
	295	* such as the start of vmalloc space etc.
	296	* This helps in the interpretation.
	297	*/
	298	if (st->current_address >= st->marker[1].start_address) {
3891a04a PA	299	if (st->marker->max_lines &&
	300	st->lines > st->marker->max_lines) {
	301	unsigned long nskip =
	302	st->lines - st->marker->max_lines;
	303	pt_dump_seq_printf(m, st->to_dmesg,
	304	"... %lu entr%s skipped ... \n",
	305	nskip,
	306	nskip == 1 ? "y" : "ies");
	307	}
fe770bf0	308	st->marker++;
3891a04a	309	st->lines = 0;
ef6bea6d BP	310	pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
ef6bea6d BP	311	st->marker->name);
926e5392	312	}
fe770bf0	313
926e5392 AV	314	st->start_address = st->current_address;
	315	st->current_prot = new_prot;
	316	st->level = level;
fe770bf0	317	}
926e5392 AV	318	}
926e5392 AV	319
fdd3d8ce	320	static void walk_pte_level(struct seq_file m, struct pg_state st, pmd_t addr, unsigned long P)
926e5392 AV	321	{
	322	int i;
	323	pte_t *start;
da25e628	324	pgprotval_t prot;
926e5392	325
fdd3d8ce	326	start = (pte_t *)pmd_page_vaddr(addr);
926e5392	327	for (i = 0; i < PTRS_PER_PTE; i++) {
da25e628	328	prot = pte_flags(*start);
fe770bf0	329	st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
45dcd209	330	note_page(m, st, __pgprot(prot), 5);
926e5392 AV	331	start++;
	332	}
	333	}
04b67022 AR	334	#ifdef CONFIG_KASAN
	335
	336	/*
	337	* This is an optimization for KASAN=y case. Since all kasan page tables
	338	* eventually point to the kasan_zero_page we could call note_page()
	339	* right away without walking through lower level page tables. This saves
	340	* us dozens of seconds (minutes for 5-level config) while checking for
	341	* W+X mapping or reading kernel_page_tables debugfs file.
	342	*/
	343	static inline bool kasan_page_table(struct seq_file m, struct pg_state st,
	344	void *pt)
	345	{
	346	if (__pa(pt) == __pa(kasan_zero_pmd) \|\|
	347	#ifdef CONFIG_X86_5LEVEL
	348	__pa(pt) == __pa(kasan_zero_p4d) \|\|
	349	#endif
	350	__pa(pt) == __pa(kasan_zero_pud)) {
	351	pgprotval_t prot = pte_flags(kasan_zero_pte[0]);
	352	note_page(m, st, __pgprot(prot), 5);
	353	return true;
	354	}
	355	return false;
	356	}
	357	#else
	358	static inline bool kasan_page_table(struct seq_file m, struct pg_state st,
	359	void *pt)
	360	{
	361	return false;
	362	}
	363	#endif
926e5392	364
fe770bf0	365	#if PTRS_PER_PMD > 1
926e5392	366
fdd3d8ce	367	static void walk_pmd_level(struct seq_file m, struct pg_state st, pud_t addr, unsigned long P)
926e5392 AV	368	{
926e5392 AV	369	int i;
04b67022	370	pmd_t start, pmd_start;
da25e628	371	pgprotval_t prot;
926e5392	372
04b67022	373	pmd_start = start = (pmd_t *)pud_page_vaddr(addr);
926e5392	374	for (i = 0; i < PTRS_PER_PMD; i++) {
fe770bf0	375	st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
926e5392	376	if (!pmd_none(*start)) {
da25e628 TK	377	if (pmd_large(start) \|\| !pmd_present(start)) {
da25e628 TK	378	prot = pmd_flags(*start);
45dcd209	379	note_page(m, st, __pgprot(prot), 4);
04b67022	380	} else if (!kasan_page_table(m, st, pmd_start)) {
fe770bf0 PA	381	walk_pte_level(m, st, *start,
fe770bf0 PA	382	P + i * PMD_LEVEL_MULT);
da25e628	383	}
926e5392	384	} else
45dcd209	385	note_page(m, st, __pgprot(0), 4);
926e5392 AV	386	start++;
	387	}
	388	}
	389
fe770bf0 PA	390	#else
	391	#define walk_pmd_level(m,s,a,p) walk_pte_level(m,s,__pmd(pud_val(a)),p)
	392	#define pud_large(a) pmd_large(__pmd(pud_val(a)))
	393	#define pud_none(a) pmd_none(__pmd(pud_val(a)))
	394	#endif
926e5392	395
fe770bf0 PA	396	#if PTRS_PER_PUD > 1
fe770bf0 PA	397
fdd3d8ce	398	static void walk_pud_level(struct seq_file m, struct pg_state st, p4d_t addr, unsigned long P)
926e5392 AV	399	{
926e5392 AV	400	int i;
04b67022	401	pud_t start, pud_start;
da25e628	402	pgprotval_t prot;
243b72aa	403	pud_t *prev_pud = NULL;
926e5392	404
04b67022	405	pud_start = start = (pud_t *)p4d_page_vaddr(addr);
926e5392 AV	406
926e5392 AV	407	for (i = 0; i < PTRS_PER_PUD; i++) {
fe770bf0	408	st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
04b67022	409	if (!pud_none(*start)) {
da25e628 TK	410	if (pud_large(start) \|\| !pud_present(start)) {
da25e628 TK	411	prot = pud_flags(*start);
45dcd209	412	note_page(m, st, __pgprot(prot), 3);
04b67022	413	} else if (!kasan_page_table(m, st, pud_start)) {
fe770bf0 PA	414	walk_pmd_level(m, st, *start,
fe770bf0 PA	415	P + i * PUD_LEVEL_MULT);
da25e628	416	}
926e5392	417	} else
45dcd209	418	note_page(m, st, __pgprot(0), 3);
926e5392	419
243b72aa	420	prev_pud = start;
926e5392 AV	421	start++;
	422	}
	423	}
	424
fe770bf0	425	#else
fdd3d8ce KS	426	#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(p4d_val(a)),p)
	427	#define p4d_large(a) pud_large(__pud(p4d_val(a)))
	428	#define p4d_none(a) pud_none(__pud(p4d_val(a)))
	429	#endif
	430
	431	#if PTRS_PER_P4D > 1
	432
	433	static void walk_p4d_level(struct seq_file m, struct pg_state st, pgd_t addr, unsigned long P)
	434	{
	435	int i;
04b67022	436	p4d_t start, p4d_start;
fdd3d8ce KS	437	pgprotval_t prot;
fdd3d8ce KS	438
04b67022	439	p4d_start = start = (p4d_t *)pgd_page_vaddr(addr);
fdd3d8ce KS	440
	441	for (i = 0; i < PTRS_PER_P4D; i++) {
	442	st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
	443	if (!p4d_none(*start)) {
	444	if (p4d_large(start) \|\| !p4d_present(start)) {
	445	prot = p4d_flags(*start);
	446	note_page(m, st, __pgprot(prot), 2);
04b67022	447	} else if (!kasan_page_table(m, st, p4d_start)) {
fdd3d8ce KS	448	walk_pud_level(m, st, *start,
	449	P + i * P4D_LEVEL_MULT);
	450	}
	451	} else
	452	note_page(m, st, __pgprot(0), 2);
	453
	454	start++;
	455	}
	456	}
	457
	458	#else
	459	#define walk_p4d_level(m,s,a,p) walk_pud_level(m,s,__p4d(pgd_val(a)),p)
	460	#define pgd_large(a) p4d_large(__p4d(pgd_val(a)))
	461	#define pgd_none(a) p4d_none(__p4d(pgd_val(a)))
fe770bf0 PA	462	#endif
fe770bf0 PA	463
f4e342c8 BO	464	static inline bool is_hypervisor_range(int idx)
f4e342c8 BO	465	{
b176862f	466	#ifdef CONFIG_X86_64
f4e342c8 BO	467	/*
	468	* ffff800000000000 - ffff87ffffffffff is reserved for
	469	* the hypervisor.
	470	*/
b176862f BP	471	return (idx >= pgd_index(__PAGE_OFFSET) - 16) &&
b176862f BP	472	(idx < pgd_index(__PAGE_OFFSET));
f4e342c8	473	#else
b176862f	474	return false;
f4e342c8	475	#endif
b176862f	476	}
f4e342c8	477
e1a58320	478	static void ptdump_walk_pgd_level_core(struct seq_file m, pgd_t pgd,
b4bf4f92	479	bool checkwx, bool dmesg)
926e5392	480	{
fe770bf0	481	#ifdef CONFIG_X86_64
65ade2f8	482	pgd_t start = (pgd_t ) &init_top_pgt;
fe770bf0 PA	483	#else
	484	pgd_t *start = swapper_pg_dir;
	485	#endif
da25e628	486	pgprotval_t prot;
926e5392	487	int i;
ef6bea6d	488	struct pg_state st = {};
926e5392	489
ef6bea6d BP	490	if (pgd) {
ef6bea6d BP	491	start = pgd;
b4bf4f92	492	st.to_dmesg = dmesg;
ef6bea6d	493	}
926e5392	494
e1a58320 SS	495	st.check_wx = checkwx;
	496	if (checkwx)
	497	st.wx_pages = 0;
	498
926e5392	499	for (i = 0; i < PTRS_PER_PGD; i++) {
fe770bf0	500	st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
f4e342c8	501	if (!pgd_none(*start) && !is_hypervisor_range(i)) {
da25e628 TK	502	if (pgd_large(start) \|\| !pgd_present(start)) {
da25e628 TK	503	prot = pgd_flags(*start);
fe770bf0	504	note_page(m, &st, __pgprot(prot), 1);
da25e628	505	} else {
fdd3d8ce	506	walk_p4d_level(m, &st, *start,
fe770bf0	507	i * PGD_LEVEL_MULT);
da25e628	508	}
fe770bf0	509	} else
926e5392	510	note_page(m, &st, __pgprot(0), 1);
fe770bf0	511
146fbb76	512	cond_resched();
926e5392 AV	513	start++;
926e5392 AV	514	}
fe770bf0 PA	515
	516	/* Flush out the last page */
	517	st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
	518	note_page(m, &st, __pgprot(0), 0);
e1a58320 SS	519	if (!checkwx)
	520	return;
	521	if (st.wx_pages)
	522	pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
	523	st.wx_pages);
	524	else
	525	pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
	526	}
	527
	528	void ptdump_walk_pgd_level(struct seq_file m, pgd_t pgd)
	529	{
b4bf4f92 TG	530	ptdump_walk_pgd_level_core(m, pgd, false, true);
	531	}
	532
a4b51ef6	533	void ptdump_walk_pgd_level_debugfs(struct seq_file m, pgd_t pgd, bool user)
b4bf4f92	534	{
a4b51ef6 TG	535	#ifdef CONFIG_PAGE_TABLE_ISOLATION
	536	if (user && static_cpu_has(X86_FEATURE_PTI))
	537	pgd = kernel_to_user_pgdp(pgd);
	538	#endif
b4bf4f92 TG	539	ptdump_walk_pgd_level_core(m, pgd, false, false);
	540	}
	541	EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs);
	542
	543	static void ptdump_walk_user_pgd_level_checkwx(void)
	544	{
	545	#ifdef CONFIG_PAGE_TABLE_ISOLATION
	546	pgd_t pgd = (pgd_t ) &init_top_pgt;
	547
	548	if (!static_cpu_has(X86_FEATURE_PTI))
	549	return;
	550
	551	pr_info("x86/mm: Checking user space page tables\n");
	552	pgd = kernel_to_user_pgdp(pgd);
	553	ptdump_walk_pgd_level_core(NULL, pgd, true, false);
	554	#endif
926e5392 AV	555	}
926e5392 AV	556
e1a58320 SS	557	void ptdump_walk_pgd_level_checkwx(void)
e1a58320 SS	558	{
b4bf4f92 TG	559	ptdump_walk_pgd_level_core(NULL, NULL, true, false);
b4bf4f92 TG	560	ptdump_walk_user_pgd_level_checkwx();
e1a58320 SS	561	}
e1a58320 SS	562
8609d1b5	563	static int __init pt_dump_init(void)
926e5392	564	{
0483e1fa TG	565	/*
	566	* Various markers are not compile-time constants, so assign them
	567	* here.
	568	*/
	569	#ifdef CONFIG_X86_64
	570	address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET;
	571	address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
	572	address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
	573	#endif
fe770bf0	574	#ifdef CONFIG_X86_32
92851e2f AS	575	address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
92851e2f AS	576	address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
fe770bf0	577	# ifdef CONFIG_HIGHMEM
92851e2f	578	address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE;
fe770bf0	579	# endif
92851e2f	580	address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
92a0f81d	581	address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE;
fe770bf0	582	#endif
926e5392 AV	583	return 0;
926e5392 AV	584	}
926e5392	585	__initcall(pt_dump_init);