symbol.c 44.5 KB
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#include <dirent.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <fcntl.h>
#include <unistd.h>
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#include <inttypes.h>
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#include "build-id.h"
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#include "util.h"
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#include "debug.h"
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#include "machine.h"
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#include "symbol.h"
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#include "strlist.h"
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#include "intlist.h"
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#include "header.h"
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#include <elf.h>
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#include <limits.h>
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#include <symbol/kallsyms.h>
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#include <sys/utsname.h>
P
Peter Zijlstra 已提交
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static int dso__load_kernel_sym(struct dso *dso, struct map *map,
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				symbol_filter_t filter);
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static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
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			symbol_filter_t filter);
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int vmlinux_path__nr_entries;
char **vmlinux_path;
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struct symbol_conf symbol_conf = {
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	.use_modules		= true,
	.try_vmlinux_path	= true,
	.annotate_src		= true,
	.demangle		= true,
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	.demangle_kernel	= false,
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	.cumulate_callchain	= true,
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	.show_hist_headers	= true,
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	.symfs			= "",
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};

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static enum dso_binary_type binary_type_symtab[] = {
	DSO_BINARY_TYPE__KALLSYMS,
	DSO_BINARY_TYPE__GUEST_KALLSYMS,
	DSO_BINARY_TYPE__JAVA_JIT,
	DSO_BINARY_TYPE__DEBUGLINK,
	DSO_BINARY_TYPE__BUILD_ID_CACHE,
	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
	DSO_BINARY_TYPE__GUEST_KMODULE,
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	DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
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	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
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	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
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	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
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	DSO_BINARY_TYPE__NOT_FOUND,
};

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#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
63

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bool symbol_type__is_a(char symbol_type, enum map_type map_type)
65
{
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	symbol_type = toupper(symbol_type);

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	switch (map_type) {
	case MAP__FUNCTION:
		return symbol_type == 'T' || symbol_type == 'W';
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	case MAP__VARIABLE:
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		return symbol_type == 'D';
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	default:
		return false;
	}
}

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static int prefix_underscores_count(const char *str)
{
	const char *tail = str;

	while (*tail == '_')
		tail++;

	return tail - str;
}

#define SYMBOL_A 0
#define SYMBOL_B 1

static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
{
	s64 a;
	s64 b;
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	size_t na, nb;
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	/* Prefer a symbol with non zero length */
	a = syma->end - syma->start;
	b = symb->end - symb->start;
	if ((b == 0) && (a > 0))
		return SYMBOL_A;
	else if ((a == 0) && (b > 0))
		return SYMBOL_B;

	/* Prefer a non weak symbol over a weak one */
	a = syma->binding == STB_WEAK;
	b = symb->binding == STB_WEAK;
	if (b && !a)
		return SYMBOL_A;
	if (a && !b)
		return SYMBOL_B;

	/* Prefer a global symbol over a non global one */
	a = syma->binding == STB_GLOBAL;
	b = symb->binding == STB_GLOBAL;
	if (a && !b)
		return SYMBOL_A;
	if (b && !a)
		return SYMBOL_B;

	/* Prefer a symbol with less underscores */
	a = prefix_underscores_count(syma->name);
	b = prefix_underscores_count(symb->name);
	if (b > a)
		return SYMBOL_A;
	else if (a > b)
		return SYMBOL_B;

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	/* Choose the symbol with the longest name */
	na = strlen(syma->name);
	nb = strlen(symb->name);
	if (na > nb)
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		return SYMBOL_A;
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	else if (na < nb)
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		return SYMBOL_B;
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	/* Avoid "SyS" kernel syscall aliases */
	if (na >= 3 && !strncmp(syma->name, "SyS", 3))
		return SYMBOL_B;
	if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
		return SYMBOL_B;

	return SYMBOL_A;
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}

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void symbols__fixup_duplicate(struct rb_root *symbols)
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{
	struct rb_node *nd;
	struct symbol *curr, *next;

	nd = rb_first(symbols);

	while (nd) {
		curr = rb_entry(nd, struct symbol, rb_node);
again:
		nd = rb_next(&curr->rb_node);
		next = rb_entry(nd, struct symbol, rb_node);

		if (!nd)
			break;

		if (curr->start != next->start)
			continue;

		if (choose_best_symbol(curr, next) == SYMBOL_A) {
			rb_erase(&next->rb_node, symbols);
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			symbol__delete(next);
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			goto again;
		} else {
			nd = rb_next(&curr->rb_node);
			rb_erase(&curr->rb_node, symbols);
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			symbol__delete(curr);
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		}
	}
}

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void symbols__fixup_end(struct rb_root *symbols)
178
{
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	struct rb_node *nd, *prevnd = rb_first(symbols);
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	struct symbol *curr, *prev;
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	if (prevnd == NULL)
		return;

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	curr = rb_entry(prevnd, struct symbol, rb_node);

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	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
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		prev = curr;
		curr = rb_entry(nd, struct symbol, rb_node);
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		if (prev->end == prev->start && prev->end != curr->start)
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			prev->end = curr->start;
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	}
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	/* Last entry */
	if (curr->end == curr->start)
		curr->end = roundup(curr->start, 4096);
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}

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void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
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{
	struct map *prev, *curr;
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	struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
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	if (prevnd == NULL)
		return;

	curr = rb_entry(prevnd, struct map, rb_node);

	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
		prev = curr;
		curr = rb_entry(nd, struct map, rb_node);
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		prev->end = curr->start;
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	}
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	/*
	 * We still haven't the actual symbols, so guess the
	 * last map final address.
	 */
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	curr->end = ~0ULL;
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}

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struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
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{
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	size_t namelen = strlen(name) + 1;
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	struct symbol *sym = calloc(1, (symbol_conf.priv_size +
					sizeof(*sym) + namelen));
	if (sym == NULL)
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		return NULL;

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	if (symbol_conf.priv_size)
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		sym = ((void *)sym) + symbol_conf.priv_size;
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	sym->start   = start;
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	sym->end     = len ? start + len : start;
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	sym->binding = binding;
	sym->namelen = namelen - 1;
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	pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
		  __func__, name, start, sym->end);
	memcpy(sym->name, name, namelen);
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	return sym;
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}

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void symbol__delete(struct symbol *sym)
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{
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	free(((void *)sym) - symbol_conf.priv_size);
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}

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size_t symbol__fprintf(struct symbol *sym, FILE *fp)
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{
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	return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
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		       sym->start, sym->end,
		       sym->binding == STB_GLOBAL ? 'g' :
		       sym->binding == STB_LOCAL  ? 'l' : 'w',
		       sym->name);
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}

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size_t symbol__fprintf_symname_offs(const struct symbol *sym,
				    const struct addr_location *al, FILE *fp)
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{
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	unsigned long offset;
	size_t length;

	if (sym && sym->name) {
		length = fprintf(fp, "%s", sym->name);
		if (al) {
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			if (al->addr < sym->end)
				offset = al->addr - sym->start;
			else
				offset = al->addr - al->map->start - sym->start;
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			length += fprintf(fp, "+0x%lx", offset);
		}
		return length;
	} else
		return fprintf(fp, "[unknown]");
}
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size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
{
	return symbol__fprintf_symname_offs(sym, NULL, fp);
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}

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void symbols__delete(struct rb_root *symbols)
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{
	struct symbol *pos;
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	struct rb_node *next = rb_first(symbols);
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	while (next) {
		pos = rb_entry(next, struct symbol, rb_node);
		next = rb_next(&pos->rb_node);
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		rb_erase(&pos->rb_node, symbols);
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		symbol__delete(pos);
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	}
}

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void symbols__insert(struct rb_root *symbols, struct symbol *sym)
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{
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	struct rb_node **p = &symbols->rb_node;
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	struct rb_node *parent = NULL;
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	const u64 ip = sym->start;
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	struct symbol *s;

	while (*p != NULL) {
		parent = *p;
		s = rb_entry(parent, struct symbol, rb_node);
		if (ip < s->start)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}
	rb_link_node(&sym->rb_node, parent, p);
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	rb_insert_color(&sym->rb_node, symbols);
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}

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static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
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{
	struct rb_node *n;

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	if (symbols == NULL)
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		return NULL;

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	n = symbols->rb_node;
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	while (n) {
		struct symbol *s = rb_entry(n, struct symbol, rb_node);

		if (ip < s->start)
			n = n->rb_left;
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		else if (ip >= s->end)
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			n = n->rb_right;
		else
			return s;
	}

	return NULL;
}

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static struct symbol *symbols__first(struct rb_root *symbols)
{
	struct rb_node *n = rb_first(symbols);

	if (n)
		return rb_entry(n, struct symbol, rb_node);

	return NULL;
}

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static struct symbol *symbols__next(struct symbol *sym)
{
	struct rb_node *n = rb_next(&sym->rb_node);

	if (n)
		return rb_entry(n, struct symbol, rb_node);

	return NULL;
}

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struct symbol_name_rb_node {
	struct rb_node	rb_node;
	struct symbol	sym;
};

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static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
366
{
367
	struct rb_node **p = &symbols->rb_node;
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	struct rb_node *parent = NULL;
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	struct symbol_name_rb_node *symn, *s;

	symn = container_of(sym, struct symbol_name_rb_node, sym);
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	while (*p != NULL) {
		parent = *p;
		s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
		if (strcmp(sym->name, s->sym.name) < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}
	rb_link_node(&symn->rb_node, parent, p);
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	rb_insert_color(&symn->rb_node, symbols);
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}

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static void symbols__sort_by_name(struct rb_root *symbols,
				  struct rb_root *source)
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{
	struct rb_node *nd;

	for (nd = rb_first(source); nd; nd = rb_next(nd)) {
		struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
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		symbols__insert_by_name(symbols, pos);
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	}
}

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static struct symbol *symbols__find_by_name(struct rb_root *symbols,
					    const char *name)
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{
	struct rb_node *n;
400
	struct symbol_name_rb_node *s;
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402
	if (symbols == NULL)
403 404
		return NULL;

405
	n = symbols->rb_node;
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	while (n) {
		int cmp;

		s = rb_entry(n, struct symbol_name_rb_node, rb_node);
		cmp = strcmp(name, s->sym.name);

		if (cmp < 0)
			n = n->rb_left;
		else if (cmp > 0)
			n = n->rb_right;
		else
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			break;
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	}

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	if (n == NULL)
		return NULL;

	/* return first symbol that has same name (if any) */
	for (n = rb_prev(n); n; n = rb_prev(n)) {
		struct symbol_name_rb_node *tmp;

		tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
		if (strcmp(tmp->sym.name, s->sym.name))
			break;

		s = tmp;
	}

	return &s->sym;
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}

438
struct symbol *dso__find_symbol(struct dso *dso,
439
				enum map_type type, u64 addr)
440
{
441
	return symbols__find(&dso->symbols[type], addr);
442 443
}

444
struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
445 446
{
	return symbols__first(&dso->symbols[type]);
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}

struct symbol *dso__next_symbol(struct symbol *sym)
{
	return symbols__next(sym);
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}

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struct symbol *symbol__next_by_name(struct symbol *sym)
{
	struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
	struct rb_node *n = rb_next(&s->rb_node);

	return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
}

 /*
  * Teturns first symbol that matched with @name.
  */
465
struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
466 467
					const char *name)
{
468
	return symbols__find_by_name(&dso->symbol_names[type], name);
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}

471
void dso__sort_by_name(struct dso *dso, enum map_type type)
472
{
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	dso__set_sorted_by_name(dso, type);
	return symbols__sort_by_name(&dso->symbol_names[type],
				     &dso->symbols[type]);
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}

478 479
size_t dso__fprintf_symbols_by_name(struct dso *dso,
				    enum map_type type, FILE *fp)
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{
	size_t ret = 0;
	struct rb_node *nd;
	struct symbol_name_rb_node *pos;

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	for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
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		pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
		fprintf(fp, "%s\n", pos->sym.name);
	}

	return ret;
}

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int modules__parse(const char *filename, void *arg,
		   int (*process_module)(void *arg, const char *name,
					 u64 start))
{
	char *line = NULL;
	size_t n;
	FILE *file;
	int err = 0;

	file = fopen(filename, "r");
	if (file == NULL)
		return -1;

	while (1) {
		char name[PATH_MAX];
		u64 start;
		char *sep;
		ssize_t line_len;

		line_len = getline(&line, &n, file);
		if (line_len < 0) {
			if (feof(file))
				break;
			err = -1;
			goto out;
		}

		if (!line) {
			err = -1;
			goto out;
		}

		line[--line_len] = '\0'; /* \n */

		sep = strrchr(line, 'x');
		if (sep == NULL)
			continue;

		hex2u64(sep + 1, &start);

		sep = strchr(line, ' ');
		if (sep == NULL)
			continue;

		*sep = '\0';

		scnprintf(name, sizeof(name), "[%s]", line);

		err = process_module(arg, name, start);
		if (err)
			break;
	}
out:
	free(line);
	fclose(file);
	return err;
}

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struct process_kallsyms_args {
	struct map *map;
	struct dso *dso;
};

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/*
 * These are symbols in the kernel image, so make sure that
 * sym is from a kernel DSO.
 */
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bool symbol__is_idle(struct symbol *sym)
{
	const char * const idle_symbols[] = {
		"cpu_idle",
564
		"cpu_startup_entry",
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		"intel_idle",
		"default_idle",
		"native_safe_halt",
		"enter_idle",
		"exit_idle",
		"mwait_idle",
		"mwait_idle_with_hints",
		"poll_idle",
		"ppc64_runlatch_off",
		"pseries_dedicated_idle_sleep",
		NULL
	};

	int i;

	if (!sym)
		return false;

	for (i = 0; idle_symbols[i]; i++) {
		if (!strcmp(idle_symbols[i], sym->name))
			return true;
	}

	return false;
}

591
static int map__process_kallsym_symbol(void *arg, const char *name,
592
				       char type, u64 start)
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{
	struct symbol *sym;
	struct process_kallsyms_args *a = arg;
	struct rb_root *root = &a->dso->symbols[a->map->type];

	if (!symbol_type__is_a(type, a->map->type))
		return 0;

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	/*
	 * module symbols are not sorted so we add all
	 * symbols, setting length to 0, and rely on
	 * symbols__fixup_end() to fix it up.
	 */
	sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
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	if (sym == NULL)
		return -ENOMEM;
	/*
	 * We will pass the symbols to the filter later, in
	 * map__split_kallsyms, when we have split the maps per module
	 */
	symbols__insert(root, sym);
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	return 0;
}

/*
 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 * so that we can in the next step set the symbol ->end address and then
 * call kernel_maps__split_kallsyms.
 */
623
static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
624
				  struct map *map)
625
{
626
	struct process_kallsyms_args args = { .map = map, .dso = dso, };
627
	return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
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}

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static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
					 symbol_filter_t filter)
{
633
	struct map_groups *kmaps = map__kmaps(map);
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	struct map *curr_map;
	struct symbol *pos;
	int count = 0, moved = 0;
	struct rb_root *root = &dso->symbols[map->type];
	struct rb_node *next = rb_first(root);

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	if (!kmaps)
		return -1;

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	while (next) {
		char *module;

		pos = rb_entry(next, struct symbol, rb_node);
		next = rb_next(&pos->rb_node);

		module = strchr(pos->name, '\t');
		if (module)
			*module = '\0';

		curr_map = map_groups__find(kmaps, map->type, pos->start);

		if (!curr_map || (filter && filter(curr_map, pos))) {
			rb_erase(&pos->rb_node, root);
			symbol__delete(pos);
		} else {
			pos->start -= curr_map->start - curr_map->pgoff;
			if (pos->end)
				pos->end -= curr_map->start - curr_map->pgoff;
			if (curr_map != map) {
				rb_erase(&pos->rb_node, root);
				symbols__insert(
					&curr_map->dso->symbols[curr_map->type],
					pos);
				++moved;
			} else {
				++count;
			}
		}
	}

	/* Symbols have been adjusted */
	dso->adjust_symbols = 1;

	return count + moved;
}

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/*
 * Split the symbols into maps, making sure there are no overlaps, i.e. the
 * kernel range is broken in several maps, named [kernel].N, as we don't have
 * the original ELF section names vmlinux have.
 */
685
static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
686
			       symbol_filter_t filter)
687
{
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	struct map_groups *kmaps = map__kmaps(map);
	struct machine *machine;
690
	struct map *curr_map = map;
691
	struct symbol *pos;
692
	int count = 0, moved = 0;
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	struct rb_root *root = &dso->symbols[map->type];
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	struct rb_node *next = rb_first(root);
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	int kernel_range = 0;

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	if (!kmaps)
		return -1;

	machine = kmaps->machine;

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	while (next) {
		char *module;

		pos = rb_entry(next, struct symbol, rb_node);
		next = rb_next(&pos->rb_node);

		module = strchr(pos->name, '\t');
		if (module) {
710
			if (!symbol_conf.use_modules)
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				goto discard_symbol;

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			*module++ = '\0';

715
			if (strcmp(curr_map->dso->short_name, module)) {
716
				if (curr_map != map &&
717
				    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
718
				    machine__is_default_guest(machine)) {
719 720 721 722 723 724 725 726 727 728 729 730 731
					/*
					 * We assume all symbols of a module are
					 * continuous in * kallsyms, so curr_map
					 * points to a module and all its
					 * symbols are in its kmap. Mark it as
					 * loaded.
					 */
					dso__set_loaded(curr_map->dso,
							curr_map->type);
				}

				curr_map = map_groups__find_by_name(kmaps,
							map->type, module);
732
				if (curr_map == NULL) {
733
					pr_debug("%s/proc/{kallsyms,modules} "
734
					         "inconsistency while looking "
735
						 "for \"%s\" module!\n",
736
						 machine->root_dir, module);
737 738
					curr_map = map;
					goto discard_symbol;
739
				}
740

741
				if (curr_map->dso->loaded &&
742
				    !machine__is_default_guest(machine))
743
					goto discard_symbol;
744
			}
745 746 747 748
			/*
			 * So that we look just like we get from .ko files,
			 * i.e. not prelinked, relative to map->start.
			 */
749 750 751
			pos->start = curr_map->map_ip(curr_map, pos->start);
			pos->end   = curr_map->map_ip(curr_map, pos->end);
		} else if (curr_map != map) {
752
			char dso_name[PATH_MAX];
753
			struct dso *ndso;
754

755 756 757 758 759 760
			if (delta) {
				/* Kernel was relocated at boot time */
				pos->start -= delta;
				pos->end -= delta;
			}

761 762 763 764 765
			if (count == 0) {
				curr_map = map;
				goto filter_symbol;
			}

766
			if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
767 768 769 770 771 772 773
				snprintf(dso_name, sizeof(dso_name),
					"[guest.kernel].%d",
					kernel_range++);
			else
				snprintf(dso_name, sizeof(dso_name),
					"[kernel].%d",
					kernel_range++);
774

775 776
			ndso = dso__new(dso_name);
			if (ndso == NULL)
777 778
				return -1;

779
			ndso->kernel = dso->kernel;
780

781
			curr_map = map__new2(pos->start, ndso, map->type);
782
			if (curr_map == NULL) {
783
				dso__delete(ndso);
784 785
				return -1;
			}
786

787
			curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
788
			map_groups__insert(kmaps, curr_map);
789
			++kernel_range;
790 791 792 793
		} else if (delta) {
			/* Kernel was relocated at boot time */
			pos->start -= delta;
			pos->end -= delta;
794
		}
795
filter_symbol:
796
		if (filter && filter(curr_map, pos)) {
797
discard_symbol:		rb_erase(&pos->rb_node, root);
798
			symbol__delete(pos);
799
		} else {
800 801 802
			if (curr_map != map) {
				rb_erase(&pos->rb_node, root);
				symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
803 804 805
				++moved;
			} else
				++count;
806
		}
807 808
	}

809
	if (curr_map != map &&
810
	    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
811
	    machine__is_default_guest(kmaps->machine)) {
812 813 814
		dso__set_loaded(curr_map->dso, curr_map->type);
	}

815
	return count + moved;
816
}
817

818 819
bool symbol__restricted_filename(const char *filename,
				 const char *restricted_filename)
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
{
	bool restricted = false;

	if (symbol_conf.kptr_restrict) {
		char *r = realpath(filename, NULL);

		if (r != NULL) {
			restricted = strcmp(r, restricted_filename) == 0;
			free(r);
			return restricted;
		}
	}

	return restricted;
}

836 837 838 839
struct module_info {
	struct rb_node rb_node;
	char *name;
	u64 start;
840 841
};

842
static void add_module(struct module_info *mi, struct rb_root *modules)
843
{
844 845 846
	struct rb_node **p = &modules->rb_node;
	struct rb_node *parent = NULL;
	struct module_info *m;
847

848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
	while (*p != NULL) {
		parent = *p;
		m = rb_entry(parent, struct module_info, rb_node);
		if (strcmp(mi->name, m->name) < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}
	rb_link_node(&mi->rb_node, parent, p);
	rb_insert_color(&mi->rb_node, modules);
}

static void delete_modules(struct rb_root *modules)
{
	struct module_info *mi;
	struct rb_node *next = rb_first(modules);

	while (next) {
		mi = rb_entry(next, struct module_info, rb_node);
		next = rb_next(&mi->rb_node);
		rb_erase(&mi->rb_node, modules);
869
		zfree(&mi->name);
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
		free(mi);
	}
}

static struct module_info *find_module(const char *name,
				       struct rb_root *modules)
{
	struct rb_node *n = modules->rb_node;

	while (n) {
		struct module_info *m;
		int cmp;

		m = rb_entry(n, struct module_info, rb_node);
		cmp = strcmp(name, m->name);
		if (cmp < 0)
			n = n->rb_left;
		else if (cmp > 0)
			n = n->rb_right;
		else
			return m;
	}

	return NULL;
}

static int __read_proc_modules(void *arg, const char *name, u64 start)
{
	struct rb_root *modules = arg;
	struct module_info *mi;

	mi = zalloc(sizeof(struct module_info));
	if (!mi)
903 904
		return -ENOMEM;

905 906
	mi->name = strdup(name);
	mi->start = start;
907

908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926
	if (!mi->name) {
		free(mi);
		return -ENOMEM;
	}

	add_module(mi, modules);

	return 0;
}

static int read_proc_modules(const char *filename, struct rb_root *modules)
{
	if (symbol__restricted_filename(filename, "/proc/modules"))
		return -1;

	if (modules__parse(filename, modules, __read_proc_modules)) {
		delete_modules(modules);
		return -1;
	}
927 928 929 930

	return 0;
}

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
int compare_proc_modules(const char *from, const char *to)
{
	struct rb_root from_modules = RB_ROOT;
	struct rb_root to_modules = RB_ROOT;
	struct rb_node *from_node, *to_node;
	struct module_info *from_m, *to_m;
	int ret = -1;

	if (read_proc_modules(from, &from_modules))
		return -1;

	if (read_proc_modules(to, &to_modules))
		goto out_delete_from;

	from_node = rb_first(&from_modules);
	to_node = rb_first(&to_modules);
	while (from_node) {
		if (!to_node)
			break;

		from_m = rb_entry(from_node, struct module_info, rb_node);
		to_m = rb_entry(to_node, struct module_info, rb_node);

		if (from_m->start != to_m->start ||
		    strcmp(from_m->name, to_m->name))
			break;

		from_node = rb_next(from_node);
		to_node = rb_next(to_node);
	}

	if (!from_node && !to_node)
		ret = 0;

	delete_modules(&to_modules);
out_delete_from:
	delete_modules(&from_modules);

	return ret;
}

972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
static int do_validate_kcore_modules(const char *filename, struct map *map,
				  struct map_groups *kmaps)
{
	struct rb_root modules = RB_ROOT;
	struct map *old_map;
	int err;

	err = read_proc_modules(filename, &modules);
	if (err)
		return err;

	old_map = map_groups__first(kmaps, map->type);
	while (old_map) {
		struct map *next = map_groups__next(old_map);
		struct module_info *mi;

		if (old_map == map || old_map->start == map->start) {
			/* The kernel map */
			old_map = next;
			continue;
		}

		/* Module must be in memory at the same address */
		mi = find_module(old_map->dso->short_name, &modules);
		if (!mi || mi->start != old_map->start) {
			err = -EINVAL;
			goto out;
		}

		old_map = next;
	}
out:
	delete_modules(&modules);
	return err;
}

1008
/*
1009
 * If kallsyms is referenced by name then we look for filename in the same
1010 1011
 * directory.
 */
1012 1013 1014
static bool filename_from_kallsyms_filename(char *filename,
					    const char *base_name,
					    const char *kallsyms_filename)
1015 1016 1017
{
	char *name;

1018 1019
	strcpy(filename, kallsyms_filename);
	name = strrchr(filename, '/');
1020 1021 1022
	if (!name)
		return false;

1023 1024 1025 1026
	name += 1;

	if (!strcmp(name, "kallsyms")) {
		strcpy(name, base_name);
1027 1028 1029 1030 1031 1032
		return true;
	}

	return false;
}

1033 1034 1035
static int validate_kcore_modules(const char *kallsyms_filename,
				  struct map *map)
{
1036
	struct map_groups *kmaps = map__kmaps(map);
1037 1038
	char modules_filename[PATH_MAX];

1039 1040 1041
	if (!kmaps)
		return -EINVAL;

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	if (!filename_from_kallsyms_filename(modules_filename, "modules",
					     kallsyms_filename))
		return -EINVAL;

	if (do_validate_kcore_modules(modules_filename, map, kmaps))
		return -EINVAL;

	return 0;
}

1052 1053 1054 1055 1056
static int validate_kcore_addresses(const char *kallsyms_filename,
				    struct map *map)
{
	struct kmap *kmap = map__kmap(map);

1057 1058 1059
	if (!kmap)
		return -EINVAL;

1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
	if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
		u64 start;

		start = kallsyms__get_function_start(kallsyms_filename,
						     kmap->ref_reloc_sym->name);
		if (start != kmap->ref_reloc_sym->addr)
			return -EINVAL;
	}

	return validate_kcore_modules(kallsyms_filename, map);
}

1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
struct kcore_mapfn_data {
	struct dso *dso;
	enum map_type type;
	struct list_head maps;
};

static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
{
	struct kcore_mapfn_data *md = data;
	struct map *map;

	map = map__new2(start, md->dso, md->type);
	if (map == NULL)
		return -ENOMEM;

	map->end = map->start + len;
	map->pgoff = pgoff;

	list_add(&map->node, &md->maps);

	return 0;
}

1095 1096 1097
static int dso__load_kcore(struct dso *dso, struct map *map,
			   const char *kallsyms_filename)
{
1098 1099
	struct map_groups *kmaps = map__kmaps(map);
	struct machine *machine;
1100 1101 1102 1103 1104 1105 1106
	struct kcore_mapfn_data md;
	struct map *old_map, *new_map, *replacement_map = NULL;
	bool is_64_bit;
	int err, fd;
	char kcore_filename[PATH_MAX];
	struct symbol *sym;

1107 1108 1109 1110 1111
	if (!kmaps)
		return -EINVAL;

	machine = kmaps->machine;

1112 1113 1114 1115
	/* This function requires that the map is the kernel map */
	if (map != machine->vmlinux_maps[map->type])
		return -EINVAL;

1116 1117 1118 1119
	if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
					     kallsyms_filename))
		return -EINVAL;

1120 1121
	/* Modules and kernel must be present at their original addresses */
	if (validate_kcore_addresses(kallsyms_filename, map))
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
		return -EINVAL;

	md.dso = dso;
	md.type = map->type;
	INIT_LIST_HEAD(&md.maps);

	fd = open(kcore_filename, O_RDONLY);
	if (fd < 0)
		return -EINVAL;

	/* Read new maps into temporary lists */
	err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
			      &is_64_bit);
	if (err)
		goto out_err;
1137
	dso->is_64_bit = is_64_bit;
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190

	if (list_empty(&md.maps)) {
		err = -EINVAL;
		goto out_err;
	}

	/* Remove old maps */
	old_map = map_groups__first(kmaps, map->type);
	while (old_map) {
		struct map *next = map_groups__next(old_map);

		if (old_map != map)
			map_groups__remove(kmaps, old_map);
		old_map = next;
	}

	/* Find the kernel map using the first symbol */
	sym = dso__first_symbol(dso, map->type);
	list_for_each_entry(new_map, &md.maps, node) {
		if (sym && sym->start >= new_map->start &&
		    sym->start < new_map->end) {
			replacement_map = new_map;
			break;
		}
	}

	if (!replacement_map)
		replacement_map = list_entry(md.maps.next, struct map, node);

	/* Add new maps */
	while (!list_empty(&md.maps)) {
		new_map = list_entry(md.maps.next, struct map, node);
		list_del(&new_map->node);
		if (new_map == replacement_map) {
			map->start	= new_map->start;
			map->end	= new_map->end;
			map->pgoff	= new_map->pgoff;
			map->map_ip	= new_map->map_ip;
			map->unmap_ip	= new_map->unmap_ip;
			map__delete(new_map);
			/* Ensure maps are correctly ordered */
			map_groups__remove(kmaps, map);
			map_groups__insert(kmaps, map);
		} else {
			map_groups__insert(kmaps, new_map);
		}
	}

	/*
	 * Set the data type and long name so that kcore can be read via
	 * dso__data_read_addr().
	 */
	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1191
		dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1192
	else
1193
		dso->binary_type = DSO_BINARY_TYPE__KCORE;
1194
	dso__set_long_name(dso, strdup(kcore_filename), true);
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214

	close(fd);

	if (map->type == MAP__FUNCTION)
		pr_debug("Using %s for kernel object code\n", kcore_filename);
	else
		pr_debug("Using %s for kernel data\n", kcore_filename);

	return 0;

out_err:
	while (!list_empty(&md.maps)) {
		map = list_entry(md.maps.next, struct map, node);
		list_del(&map->node);
		map__delete(map);
	}
	close(fd);
	return -EINVAL;
}

1215 1216 1217 1218 1219 1220 1221 1222 1223
/*
 * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
 * delta based on the relocation reference symbol.
 */
static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
{
	struct kmap *kmap = map__kmap(map);
	u64 addr;

1224 1225 1226
	if (!kmap)
		return -1;

1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
	if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
		return 0;

	addr = kallsyms__get_function_start(filename,
					    kmap->ref_reloc_sym->name);
	if (!addr)
		return -1;

	*delta = addr - kmap->ref_reloc_sym->addr;
	return 0;
}

1239
int dso__load_kallsyms(struct dso *dso, const char *filename,
1240
		       struct map *map, symbol_filter_t filter)
1241
{
1242 1243
	u64 delta = 0;

1244 1245 1246
	if (symbol__restricted_filename(filename, "/proc/kallsyms"))
		return -1;

1247
	if (dso__load_all_kallsyms(dso, filename, map) < 0)
1248 1249
		return -1;

1250 1251 1252
	if (kallsyms__delta(map, filename, &delta))
		return -1;

1253
	symbols__fixup_duplicate(&dso->symbols[map->type]);
1254 1255
	symbols__fixup_end(&dso->symbols[map->type]);

1256
	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1257
		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1258
	else
1259
		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1260

1261 1262 1263
	if (!dso__load_kcore(dso, map, filename))
		return dso__split_kallsyms_for_kcore(dso, map, filter);
	else
1264
		return dso__split_kallsyms(dso, map, delta, filter);
1265 1266
}

1267
static int dso__load_perf_map(struct dso *dso, struct map *map,
1268
			      symbol_filter_t filter)
1269 1270 1271 1272 1273 1274
{
	char *line = NULL;
	size_t n;
	FILE *file;
	int nr_syms = 0;

1275
	file = fopen(dso->long_name, "r");
1276 1277 1278 1279
	if (file == NULL)
		goto out_failure;

	while (!feof(file)) {
1280
		u64 start, size;
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
		struct symbol *sym;
		int line_len, len;

		line_len = getline(&line, &n, file);
		if (line_len < 0)
			break;

		if (!line)
			goto out_failure;

		line[--line_len] = '\0'; /* \n */

		len = hex2u64(line, &start);

		len++;
		if (len + 2 >= line_len)
			continue;

		len += hex2u64(line + len, &size);

		len++;
		if (len + 2 >= line_len)
			continue;

1305
		sym = symbol__new(start, size, STB_GLOBAL, line + len);
1306 1307 1308 1309

		if (sym == NULL)
			goto out_delete_line;

1310
		if (filter && filter(map, sym))
1311
			symbol__delete(sym);
1312
		else {
1313
			symbols__insert(&dso->symbols[map->type], sym);
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
			nr_syms++;
		}
	}

	free(line);
	fclose(file);

	return nr_syms;

out_delete_line:
	free(line);
out_failure:
	return -1;
}

1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
					   enum dso_binary_type type)
{
	switch (type) {
	case DSO_BINARY_TYPE__JAVA_JIT:
	case DSO_BINARY_TYPE__DEBUGLINK:
	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
		return !kmod && dso->kernel == DSO_TYPE_USER;

	case DSO_BINARY_TYPE__KALLSYMS:
	case DSO_BINARY_TYPE__VMLINUX:
	case DSO_BINARY_TYPE__KCORE:
		return dso->kernel == DSO_TYPE_KERNEL;

	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
	case DSO_BINARY_TYPE__GUEST_VMLINUX:
	case DSO_BINARY_TYPE__GUEST_KCORE:
		return dso->kernel == DSO_TYPE_GUEST_KERNEL;

	case DSO_BINARY_TYPE__GUEST_KMODULE:
1353
	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1354
	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1355
	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
		/*
		 * kernel modules know their symtab type - it's set when
		 * creating a module dso in machine__new_module().
		 */
		return kmod && dso->symtab_type == type;

	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
		return true;

	case DSO_BINARY_TYPE__NOT_FOUND:
	default:
		return false;
	}
}

1371
int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1372
{
1373
	char *name;
1374
	int ret = -1;
1375
	u_int i;
1376
	struct machine *machine;
1377
	char *root_dir = (char *) "";
1378 1379 1380
	int ss_pos = 0;
	struct symsrc ss_[2];
	struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1381
	bool kmod;
1382

1383
	dso__set_loaded(dso, map->type);
1384

1385 1386 1387 1388
	if (dso->kernel == DSO_TYPE_KERNEL)
		return dso__load_kernel_sym(dso, map, filter);
	else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
		return dso__load_guest_kernel_sym(dso, map, filter);
1389

1390 1391
	if (map->groups && map->groups->machine)
		machine = map->groups->machine;
1392
	else
1393
		machine = NULL;
1394

1395
	dso->adjust_symbols = 0;
1396

1397
	if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1398 1399
		struct stat st;

1400
		if (lstat(dso->name, &st) < 0)
1401 1402 1403 1404 1405 1406 1407 1408
			return -1;

		if (st.st_uid && (st.st_uid != geteuid())) {
			pr_warning("File %s not owned by current user or root, "
				"ignoring it.\n", dso->name);
			return -1;
		}

1409
		ret = dso__load_perf_map(dso, map, filter);
1410 1411
		dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
					     DSO_BINARY_TYPE__NOT_FOUND;
1412 1413 1414
		return ret;
	}

1415 1416 1417
	if (machine)
		root_dir = machine->root_dir;

1418 1419 1420 1421
	name = malloc(PATH_MAX);
	if (!name)
		return -1;

1422
	kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1423 1424 1425
		dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1426 1427 1428

	/*
	 * Iterate over candidate debug images.
1429 1430
	 * Keep track of "interesting" ones (those which have a symtab, dynsym,
	 * and/or opd section) for processing.
1431
	 */
1432
	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1433 1434
		struct symsrc *ss = &ss_[ss_pos];
		bool next_slot = false;
1435

1436
		enum dso_binary_type symtab_type = binary_type_symtab[i];
1437

1438 1439 1440
		if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
			continue;

1441 1442
		if (dso__read_binary_type_filename(dso, symtab_type,
						   root_dir, name, PATH_MAX))
1443
			continue;
1444 1445

		/* Name is now the name of the next image to try */
1446
		if (symsrc__init(ss, dso, name, symtab_type) < 0)
1447
			continue;
1448

1449 1450 1451
		if (!syms_ss && symsrc__has_symtab(ss)) {
			syms_ss = ss;
			next_slot = true;
1452 1453
			if (!dso->symsrc_filename)
				dso->symsrc_filename = strdup(name);
1454 1455
		}

1456 1457 1458
		if (!runtime_ss && symsrc__possibly_runtime(ss)) {
			runtime_ss = ss;
			next_slot = true;
1459
		}
1460

1461 1462
		if (next_slot) {
			ss_pos++;
1463

1464 1465
			if (syms_ss && runtime_ss)
				break;
1466 1467
		} else {
			symsrc__destroy(ss);
1468
		}
1469

1470
	}
1471

1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
	if (!runtime_ss && !syms_ss)
		goto out_free;

	if (runtime_ss && !syms_ss) {
		syms_ss = runtime_ss;
	}

	/* We'll have to hope for the best */
	if (!runtime_ss && syms_ss)
		runtime_ss = syms_ss;

1483 1484 1485
	if (syms_ss)
		ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
	else
1486 1487
		ret = -1;

1488
	if (ret > 0) {
1489 1490 1491 1492 1493
		int nr_plt;

		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
		if (nr_plt > 0)
			ret += nr_plt;
1494 1495
	}

1496 1497 1498
	for (; ss_pos > 0; ss_pos--)
		symsrc__destroy(&ss_[ss_pos - 1]);
out_free:
1499
	free(name);
1500
	if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1501
		return 0;
1502 1503 1504
	return ret;
}

1505
struct map *map_groups__find_by_name(struct map_groups *mg,
1506
				     enum map_type type, const char *name)
1507 1508 1509
{
	struct rb_node *nd;

1510
	for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1511 1512
		struct map *map = rb_entry(nd, struct map, rb_node);

1513
		if (map->dso && strcmp(map->dso->short_name, name) == 0)
1514 1515 1516 1517 1518 1519
			return map;
	}

	return NULL;
}

1520
int dso__load_vmlinux(struct dso *dso, struct map *map,
1521 1522
		      const char *vmlinux, bool vmlinux_allocated,
		      symbol_filter_t filter)
1523
{
1524 1525
	int err = -1;
	struct symsrc ss;
1526
	char symfs_vmlinux[PATH_MAX];
1527
	enum dso_binary_type symtab_type;
1528

1529 1530 1531
	if (vmlinux[0] == '/')
		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
	else
1532
		symbol__join_symfs(symfs_vmlinux, vmlinux);
1533

1534
	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1535
		symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1536
	else
1537
		symtab_type = DSO_BINARY_TYPE__VMLINUX;
1538

1539
	if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1540 1541
		return -1;

1542
	err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1543
	symsrc__destroy(&ss);
1544

1545
	if (err > 0) {
1546
		if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1547
			dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1548
		else
1549
			dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1550
		dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1551
		dso__set_loaded(dso, map->type);
1552
		pr_debug("Using %s for symbols\n", symfs_vmlinux);
1553
	}
1554

1555 1556 1557
	return err;
}

1558
int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1559
			   symbol_filter_t filter)
1560 1561
{
	int i, err = 0;
1562
	char *filename = NULL;
1563

1564 1565
	if (!symbol_conf.ignore_vmlinux_buildid)
		filename = dso__build_id_filename(dso, NULL, 0);
1566
	if (filename != NULL) {
1567 1568
		err = dso__load_vmlinux(dso, map, filename, true, filter);
		if (err > 0)
1569 1570 1571
			goto out;
		free(filename);
	}
1572

1573 1574 1575
	pr_debug("Looking at the vmlinux_path (%d entries long)\n",
		 vmlinux_path__nr_entries + 1);

1576
	for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1577 1578
		err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
		if (err > 0)
1579 1580
			break;
	}
1581
out:
1582 1583 1584
	return err;
}

1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
{
	char kallsyms_filename[PATH_MAX];
	struct dirent *dent;
	int ret = -1;
	DIR *d;

	d = opendir(dir);
	if (!d)
		return -1;

	while (1) {
		dent = readdir(d);
		if (!dent)
			break;
		if (dent->d_type != DT_DIR)
			continue;
		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
			  "%s/%s/kallsyms", dir, dent->d_name);
1604
		if (!validate_kcore_addresses(kallsyms_filename, map)) {
1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
			strlcpy(dir, kallsyms_filename, dir_sz);
			ret = 0;
			break;
		}
	}

	closedir(d);

	return ret;
}

static char *dso__find_kallsyms(struct dso *dso, struct map *map)
{
	u8 host_build_id[BUILD_ID_SIZE];
	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
	bool is_host = false;
	char path[PATH_MAX];

	if (!dso->has_build_id) {
		/*
		 * Last resort, if we don't have a build-id and couldn't find
		 * any vmlinux file, try the running kernel kallsyms table.
		 */
		goto proc_kallsyms;
	}

	if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
				 sizeof(host_build_id)) == 0)
		is_host = dso__build_id_equal(dso, host_build_id);

	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);

1637 1638 1639
	scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
		  sbuild_id);

1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658
	/* Use /proc/kallsyms if possible */
	if (is_host) {
		DIR *d;
		int fd;

		/* If no cached kcore go with /proc/kallsyms */
		d = opendir(path);
		if (!d)
			goto proc_kallsyms;
		closedir(d);

		/*
		 * Do not check the build-id cache, until we know we cannot use
		 * /proc/kcore.
		 */
		fd = open("/proc/kcore", O_RDONLY);
		if (fd != -1) {
			close(fd);
			/* If module maps match go with /proc/kallsyms */
1659
			if (!validate_kcore_addresses("/proc/kallsyms", map))
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
				goto proc_kallsyms;
		}

		/* Find kallsyms in build-id cache with kcore */
		if (!find_matching_kcore(map, path, sizeof(path)))
			return strdup(path);

		goto proc_kallsyms;
	}

1670 1671 1672 1673
	/* Find kallsyms in build-id cache with kcore */
	if (!find_matching_kcore(map, path, sizeof(path)))
		return strdup(path);

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
	scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
		  buildid_dir, sbuild_id);

	if (access(path, F_OK)) {
		pr_err("No kallsyms or vmlinux with build-id %s was found\n",
		       sbuild_id);
		return NULL;
	}

	return strdup(path);

proc_kallsyms:
	return strdup("/proc/kallsyms");
}

1689
static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1690
				symbol_filter_t filter)
1691
{
1692
	int err;
1693 1694
	const char *kallsyms_filename = NULL;
	char *kallsyms_allocated_filename = NULL;
1695
	/*
1696 1697
	 * Step 1: if the user specified a kallsyms or vmlinux filename, use
	 * it and only it, reporting errors to the user if it cannot be used.
1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
	 *
	 * For instance, try to analyse an ARM perf.data file _without_ a
	 * build-id, or if the user specifies the wrong path to the right
	 * vmlinux file, obviously we can't fallback to another vmlinux (a
	 * x86_86 one, on the machine where analysis is being performed, say),
	 * or worse, /proc/kallsyms.
	 *
	 * If the specified file _has_ a build-id and there is a build-id
	 * section in the perf.data file, we will still do the expected
	 * validation in dso__load_vmlinux and will bail out if they don't
	 * match.
	 */
1710 1711 1712 1713 1714
	if (symbol_conf.kallsyms_name != NULL) {
		kallsyms_filename = symbol_conf.kallsyms_name;
		goto do_kallsyms;
	}

1715
	if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1716 1717
		return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
					 false, filter);
1718
	}
1719

1720
	if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1721
		err = dso__load_vmlinux_path(dso, map, filter);
1722
		if (err > 0)
1723
			return err;
1724 1725
	}

1726 1727 1728 1729
	/* do not try local files if a symfs was given */
	if (symbol_conf.symfs[0] != 0)
		return -1;

1730 1731 1732
	kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
	if (!kallsyms_allocated_filename)
		return -1;
1733

1734
	kallsyms_filename = kallsyms_allocated_filename;
1735

1736
do_kallsyms:
1737
	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1738 1739
	if (err > 0)
		pr_debug("Using %s for symbols\n", kallsyms_filename);
1740
	free(kallsyms_allocated_filename);
1741

1742
	if (err > 0 && !dso__is_kcore(dso)) {
1743
		dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1744
		dso__set_long_name(dso, "[kernel.kallsyms]", false);
1745 1746
		map__fixup_start(map);
		map__fixup_end(map);
1747
	}
1748

1749 1750 1751
	return err;
}

1752 1753
static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
				      symbol_filter_t filter)
1754 1755 1756
{
	int err;
	const char *kallsyms_filename = NULL;
1757
	struct machine *machine;
1758 1759 1760 1761 1762 1763
	char path[PATH_MAX];

	if (!map->groups) {
		pr_debug("Guest kernel map hasn't the point to groups\n");
		return -1;
	}
1764
	machine = map->groups->machine;
1765

1766
	if (machine__is_default_guest(machine)) {
1767 1768 1769 1770 1771 1772
		/*
		 * if the user specified a vmlinux filename, use it and only
		 * it, reporting errors to the user if it cannot be used.
		 * Or use file guest_kallsyms inputted by user on commandline
		 */
		if (symbol_conf.default_guest_vmlinux_name != NULL) {
1773
			err = dso__load_vmlinux(dso, map,
1774 1775
						symbol_conf.default_guest_vmlinux_name,
						false, filter);
1776
			return err;
1777 1778 1779 1780 1781 1782
		}

		kallsyms_filename = symbol_conf.default_guest_kallsyms;
		if (!kallsyms_filename)
			return -1;
	} else {
1783
		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1784 1785 1786
		kallsyms_filename = path;
	}

1787
	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1788
	if (err > 0)
1789
		pr_debug("Using %s for symbols\n", kallsyms_filename);
1790
	if (err > 0 && !dso__is_kcore(dso)) {
1791
		dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1792
		machine__mmap_name(machine, path, sizeof(path));
1793
		dso__set_long_name(dso, strdup(path), true);
1794 1795 1796 1797 1798 1799
		map__fixup_start(map);
		map__fixup_end(map);
	}

	return err;
}
1800

1801 1802
static void vmlinux_path__exit(void)
{
1803 1804
	while (--vmlinux_path__nr_entries >= 0)
		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1805

1806
	zfree(&vmlinux_path);
1807 1808
}

1809
static int vmlinux_path__init(struct perf_session_env *env)
1810 1811 1812
{
	struct utsname uts;
	char bf[PATH_MAX];
1813
	char *kernel_version;
1814

1815
	vmlinux_path = malloc(sizeof(char *) * 6);
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
	if (vmlinux_path == NULL)
		return -1;

	vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
	++vmlinux_path__nr_entries;
	vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
	++vmlinux_path__nr_entries;
1827

1828
	/* only try kernel version if no symfs was given */
1829 1830 1831
	if (symbol_conf.symfs[0] != 0)
		return 0;

1832 1833 1834 1835 1836 1837 1838 1839
	if (env) {
		kernel_version = env->os_release;
	} else {
		if (uname(&uts) < 0)
			goto out_fail;

		kernel_version = uts.release;
	}
1840

1841
	snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1842 1843 1844 1845
	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
	++vmlinux_path__nr_entries;
1846 1847 1848 1849 1850 1851
	snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
		 kernel_version);
	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
        ++vmlinux_path__nr_entries;
1852
	snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1853 1854 1855 1856 1857
	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
	++vmlinux_path__nr_entries;
	snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1858
		 kernel_version);
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
	++vmlinux_path__nr_entries;

	return 0;

out_fail:
	vmlinux_path__exit();
	return -1;
}

D
David Ahern 已提交
1871
int setup_list(struct strlist **list, const char *list_str,
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
		      const char *list_name)
{
	if (list_str == NULL)
		return 0;

	*list = strlist__new(true, list_str);
	if (!*list) {
		pr_err("problems parsing %s list\n", list_name);
		return -1;
	}
	return 0;
}

1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898
int setup_intlist(struct intlist **list, const char *list_str,
		  const char *list_name)
{
	if (list_str == NULL)
		return 0;

	*list = intlist__new(list_str);
	if (!*list) {
		pr_err("problems parsing %s list\n", list_name);
		return -1;
	}
	return 0;
}

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917
static bool symbol__read_kptr_restrict(void)
{
	bool value = false;

	if (geteuid() != 0) {
		FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
		if (fp != NULL) {
			char line[8];

			if (fgets(line, sizeof(line), fp) != NULL)
				value = atoi(line) != 0;

			fclose(fp);
		}
	}

	return value;
}

1918
int symbol__init(struct perf_session_env *env)
1919
{
1920 1921
	const char *symfs;

1922 1923 1924
	if (symbol_conf.initialized)
		return 0;

1925
	symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1926

1927 1928
	symbol__elf_init();

1929 1930 1931
	if (symbol_conf.sort_by_name)
		symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
					  sizeof(struct symbol));
1932

1933
	if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1934 1935
		return -1;

1936 1937 1938 1939 1940
	if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
		pr_err("'.' is the only non valid --field-separator argument\n");
		return -1;
	}

1941 1942 1943 1944 1945 1946 1947 1948
	if (setup_list(&symbol_conf.dso_list,
		       symbol_conf.dso_list_str, "dso") < 0)
		return -1;

	if (setup_list(&symbol_conf.comm_list,
		       symbol_conf.comm_list_str, "comm") < 0)
		goto out_free_dso_list;

1949 1950 1951 1952 1953 1954 1955 1956
	if (setup_intlist(&symbol_conf.pid_list,
		       symbol_conf.pid_list_str, "pid") < 0)
		goto out_free_comm_list;

	if (setup_intlist(&symbol_conf.tid_list,
		       symbol_conf.tid_list_str, "tid") < 0)
		goto out_free_pid_list;

1957 1958
	if (setup_list(&symbol_conf.sym_list,
		       symbol_conf.sym_list_str, "symbol") < 0)
1959
		goto out_free_tid_list;
1960

1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
	/*
	 * A path to symbols of "/" is identical to ""
	 * reset here for simplicity.
	 */
	symfs = realpath(symbol_conf.symfs, NULL);
	if (symfs == NULL)
		symfs = symbol_conf.symfs;
	if (strcmp(symfs, "/") == 0)
		symbol_conf.symfs = "";
	if (symfs != symbol_conf.symfs)
		free((void *)symfs);

1973 1974
	symbol_conf.kptr_restrict = symbol__read_kptr_restrict();

1975
	symbol_conf.initialized = true;
1976
	return 0;
1977

1978 1979 1980 1981
out_free_tid_list:
	intlist__delete(symbol_conf.tid_list);
out_free_pid_list:
	intlist__delete(symbol_conf.pid_list);
1982 1983
out_free_comm_list:
	strlist__delete(symbol_conf.comm_list);
1984 1985
out_free_dso_list:
	strlist__delete(symbol_conf.dso_list);
1986
	return -1;
1987 1988
}

1989 1990
void symbol__exit(void)
{
1991 1992
	if (!symbol_conf.initialized)
		return;
1993 1994 1995
	strlist__delete(symbol_conf.sym_list);
	strlist__delete(symbol_conf.dso_list);
	strlist__delete(symbol_conf.comm_list);
1996 1997
	intlist__delete(symbol_conf.tid_list);
	intlist__delete(symbol_conf.pid_list);
1998 1999
	vmlinux_path__exit();
	symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2000
	symbol_conf.initialized = false;
2001
}