symbol.c 44.9 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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33
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;
}

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int __weak arch__choose_best_symbol(struct symbol *syma,
				    struct symbol *symb __maybe_unused)
{
	/* Avoid "SyS" kernel syscall aliases */
	if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
		return SYMBOL_B;
	if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
		return SYMBOL_B;

	return SYMBOL_A;
}
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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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	return arch__choose_best_symbol(syma, symb);
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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)
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{
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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)
369
{
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	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;
403
	struct symbol_name_rb_node *s;
404

405
	if (symbols == NULL)
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		return NULL;

408
	n = symbols->rb_node;
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	while (n) {
		int cmp;

		s = rb_entry(n, struct symbol_name_rb_node, rb_node);
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		cmp = arch__compare_symbol_names(name, s->sym.name);
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		if (cmp < 0)
			n = n->rb_left;
		else if (cmp > 0)
			n = n->rb_right;
		else
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			break;
422 423
	}

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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);
432
		if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
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			break;

		s = tmp;
	}

	return &s->sym;
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}

441
struct symbol *dso__find_symbol(struct dso *dso,
442
				enum map_type type, u64 addr)
443
{
444
	return symbols__find(&dso->symbols[type], addr);
445 446
}

447
struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
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{
	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.
  */
468
struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
469 470
					const char *name)
{
471
	return symbols__find_by_name(&dso->symbol_names[type], name);
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}

474
void dso__sort_by_name(struct dso *dso, enum map_type type)
475
{
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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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}

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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",
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		"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;
}

594
static int map__process_kallsym_symbol(void *arg, const char *name,
595
				       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.
 */
626
static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
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				  struct map *map)
628
{
629
	struct process_kallsyms_args args = { .map = map, .dso = dso, };
630
	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)
{
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	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.
 */
688
static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
689
			       symbol_filter_t filter)
690
{
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	struct map_groups *kmaps = map__kmaps(map);
	struct machine *machine;
693
	struct map *curr_map = map;
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	struct symbol *pos;
695
	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) {
713
			if (!symbol_conf.use_modules)
714 715
				goto discard_symbol;

716 717
			*module++ = '\0';

718
			if (strcmp(curr_map->dso->short_name, module)) {
719
				if (curr_map != map &&
720
				    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
721
				    machine__is_default_guest(machine)) {
722 723 724 725 726 727 728 729 730 731 732 733 734
					/*
					 * 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);
735
				if (curr_map == NULL) {
736
					pr_debug("%s/proc/{kallsyms,modules} "
737
					         "inconsistency while looking "
738
						 "for \"%s\" module!\n",
739
						 machine->root_dir, module);
740 741
					curr_map = map;
					goto discard_symbol;
742
				}
743

744
				if (curr_map->dso->loaded &&
745
				    !machine__is_default_guest(machine))
746
					goto discard_symbol;
747
			}
748 749 750 751
			/*
			 * So that we look just like we get from .ko files,
			 * i.e. not prelinked, relative to map->start.
			 */
752 753 754
			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) {
755
			char dso_name[PATH_MAX];
756
			struct dso *ndso;
757

758 759 760 761 762 763
			if (delta) {
				/* Kernel was relocated at boot time */
				pos->start -= delta;
				pos->end -= delta;
			}

764 765 766 767 768
			if (count == 0) {
				curr_map = map;
				goto filter_symbol;
			}

769
			if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
770 771 772 773 774 775 776
				snprintf(dso_name, sizeof(dso_name),
					"[guest.kernel].%d",
					kernel_range++);
			else
				snprintf(dso_name, sizeof(dso_name),
					"[kernel].%d",
					kernel_range++);
777

778 779
			ndso = dso__new(dso_name);
			if (ndso == NULL)
780 781
				return -1;

782
			ndso->kernel = dso->kernel;
783

784
			curr_map = map__new2(pos->start, ndso, map->type);
785
			if (curr_map == NULL) {
786
				dso__delete(ndso);
787 788
				return -1;
			}
789

790
			curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
791
			map_groups__insert(kmaps, curr_map);
792
			++kernel_range;
793 794 795 796
		} else if (delta) {
			/* Kernel was relocated at boot time */
			pos->start -= delta;
			pos->end -= delta;
797
		}
798
filter_symbol:
799
		if (filter && filter(curr_map, pos)) {
800
discard_symbol:		rb_erase(&pos->rb_node, root);
801
			symbol__delete(pos);
802
		} else {
803 804 805
			if (curr_map != map) {
				rb_erase(&pos->rb_node, root);
				symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
806 807 808
				++moved;
			} else
				++count;
809
		}
810 811
	}

812
	if (curr_map != map &&
813
	    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
814
	    machine__is_default_guest(kmaps->machine)) {
815 816 817
		dso__set_loaded(curr_map->dso, curr_map->type);
	}

818
	return count + moved;
819
}
820

821 822
bool symbol__restricted_filename(const char *filename,
				 const char *restricted_filename)
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
{
	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;
}

839 840 841 842
struct module_info {
	struct rb_node rb_node;
	char *name;
	u64 start;
843 844
};

845
static void add_module(struct module_info *mi, struct rb_root *modules)
846
{
847 848 849
	struct rb_node **p = &modules->rb_node;
	struct rb_node *parent = NULL;
	struct module_info *m;
850

851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
	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);
872
		zfree(&mi->name);
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905
		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)
906 907
		return -ENOMEM;

908 909
	mi->name = strdup(name);
	mi->start = start;
910

911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	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;
	}
930 931 932 933

	return 0;
}

934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
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;
}

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 1008 1009 1010
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;
}

1011
/*
1012
 * If kallsyms is referenced by name then we look for filename in the same
1013 1014
 * directory.
 */
1015 1016 1017
static bool filename_from_kallsyms_filename(char *filename,
					    const char *base_name,
					    const char *kallsyms_filename)
1018 1019 1020
{
	char *name;

1021 1022
	strcpy(filename, kallsyms_filename);
	name = strrchr(filename, '/');
1023 1024 1025
	if (!name)
		return false;

1026 1027 1028 1029
	name += 1;

	if (!strcmp(name, "kallsyms")) {
		strcpy(name, base_name);
1030 1031 1032 1033 1034 1035
		return true;
	}

	return false;
}

1036 1037 1038
static int validate_kcore_modules(const char *kallsyms_filename,
				  struct map *map)
{
1039
	struct map_groups *kmaps = map__kmaps(map);
1040 1041
	char modules_filename[PATH_MAX];

1042 1043 1044
	if (!kmaps)
		return -EINVAL;

1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
	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;
}

1055 1056 1057 1058 1059
static int validate_kcore_addresses(const char *kallsyms_filename,
				    struct map *map)
{
	struct kmap *kmap = map__kmap(map);

1060 1061 1062
	if (!kmap)
		return -EINVAL;

1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
	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);
}

1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
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;
}

1098 1099 1100
static int dso__load_kcore(struct dso *dso, struct map *map,
			   const char *kallsyms_filename)
{
1101 1102
	struct map_groups *kmaps = map__kmaps(map);
	struct machine *machine;
1103 1104 1105 1106 1107 1108 1109
	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;

1110 1111 1112 1113 1114
	if (!kmaps)
		return -EINVAL;

	machine = kmaps->machine;

1115 1116 1117 1118
	/* This function requires that the map is the kernel map */
	if (map != machine->vmlinux_maps[map->type])
		return -EINVAL;

1119 1120 1121 1122
	if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
					     kallsyms_filename))
		return -EINVAL;

1123 1124
	/* Modules and kernel must be present at their original addresses */
	if (validate_kcore_addresses(kallsyms_filename, map))
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
		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;
1140
	dso->is_64_bit = is_64_bit;
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 1191 1192 1193

	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)
1194
		dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1195
	else
1196
		dso->binary_type = DSO_BINARY_TYPE__KCORE;
1197
	dso__set_long_name(dso, strdup(kcore_filename), true);
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217

	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;
}

1218 1219 1220 1221 1222 1223 1224 1225 1226
/*
 * 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;

1227 1228 1229
	if (!kmap)
		return -1;

1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
	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;
}

1242
int dso__load_kallsyms(struct dso *dso, const char *filename,
1243
		       struct map *map, symbol_filter_t filter)
1244
{
1245 1246
	u64 delta = 0;

1247 1248 1249
	if (symbol__restricted_filename(filename, "/proc/kallsyms"))
		return -1;

1250
	if (dso__load_all_kallsyms(dso, filename, map) < 0)
1251 1252
		return -1;

1253 1254 1255
	if (kallsyms__delta(map, filename, &delta))
		return -1;

1256
	symbols__fixup_duplicate(&dso->symbols[map->type]);
1257 1258
	symbols__fixup_end(&dso->symbols[map->type]);

1259
	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1260
		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1261
	else
1262
		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1263

1264 1265 1266
	if (!dso__load_kcore(dso, map, filename))
		return dso__split_kallsyms_for_kcore(dso, map, filter);
	else
1267
		return dso__split_kallsyms(dso, map, delta, filter);
1268 1269
}

1270
static int dso__load_perf_map(struct dso *dso, struct map *map,
1271
			      symbol_filter_t filter)
1272 1273 1274 1275 1276 1277
{
	char *line = NULL;
	size_t n;
	FILE *file;
	int nr_syms = 0;

1278
	file = fopen(dso->long_name, "r");
1279 1280 1281 1282
	if (file == NULL)
		goto out_failure;

	while (!feof(file)) {
1283
		u64 start, size;
1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
		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;

1308
		sym = symbol__new(start, size, STB_GLOBAL, line + len);
1309 1310 1311 1312

		if (sym == NULL)
			goto out_delete_line;

1313
		if (filter && filter(map, sym))
1314
			symbol__delete(sym);
1315
		else {
1316
			symbols__insert(&dso->symbols[map->type], sym);
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
			nr_syms++;
		}
	}

	free(line);
	fclose(file);

	return nr_syms;

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

1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
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:
1356
	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1357
	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1358
	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
		/*
		 * 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;
	}
}

1374
int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1375
{
1376
	char *name;
1377
	int ret = -1;
1378
	u_int i;
1379
	struct machine *machine;
1380
	char *root_dir = (char *) "";
1381 1382 1383
	int ss_pos = 0;
	struct symsrc ss_[2];
	struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1384
	bool kmod;
1385

1386 1387 1388 1389 1390 1391 1392
	pthread_mutex_lock(&dso->lock);

	/* check again under the dso->lock */
	if (dso__loaded(dso, map->type)) {
		ret = 1;
		goto out;
	}
1393

1394 1395 1396 1397 1398 1399 1400 1401
	if (dso->kernel) {
		if (dso->kernel == DSO_TYPE_KERNEL)
			ret = dso__load_kernel_sym(dso, map, filter);
		else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
			ret = dso__load_guest_kernel_sym(dso, map, filter);

		goto out;
	}
1402

1403 1404
	if (map->groups && map->groups->machine)
		machine = map->groups->machine;
1405
	else
1406
		machine = NULL;
1407

1408
	dso->adjust_symbols = 0;
1409

1410
	if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1411 1412
		struct stat st;

1413
		if (lstat(dso->name, &st) < 0)
1414
			goto out;
1415 1416 1417 1418

		if (st.st_uid && (st.st_uid != geteuid())) {
			pr_warning("File %s not owned by current user or root, "
				"ignoring it.\n", dso->name);
1419
			goto out;
1420 1421
		}

1422
		ret = dso__load_perf_map(dso, map, filter);
1423 1424
		dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
					     DSO_BINARY_TYPE__NOT_FOUND;
1425
		goto out;
1426 1427
	}

1428 1429 1430
	if (machine)
		root_dir = machine->root_dir;

1431 1432
	name = malloc(PATH_MAX);
	if (!name)
1433
		goto out;
1434

1435
	kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1436 1437 1438
		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;
1439 1440 1441

	/*
	 * Iterate over candidate debug images.
1442 1443
	 * Keep track of "interesting" ones (those which have a symtab, dynsym,
	 * and/or opd section) for processing.
1444
	 */
1445
	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1446 1447
		struct symsrc *ss = &ss_[ss_pos];
		bool next_slot = false;
1448

1449
		enum dso_binary_type symtab_type = binary_type_symtab[i];
1450

1451 1452 1453
		if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
			continue;

1454 1455
		if (dso__read_binary_type_filename(dso, symtab_type,
						   root_dir, name, PATH_MAX))
1456
			continue;
1457 1458

		/* Name is now the name of the next image to try */
1459
		if (symsrc__init(ss, dso, name, symtab_type) < 0)
1460
			continue;
1461

1462 1463 1464
		if (!syms_ss && symsrc__has_symtab(ss)) {
			syms_ss = ss;
			next_slot = true;
1465 1466
			if (!dso->symsrc_filename)
				dso->symsrc_filename = strdup(name);
1467 1468
		}

1469 1470 1471
		if (!runtime_ss && symsrc__possibly_runtime(ss)) {
			runtime_ss = ss;
			next_slot = true;
1472
		}
1473

1474 1475
		if (next_slot) {
			ss_pos++;
1476

1477 1478
			if (syms_ss && runtime_ss)
				break;
1479 1480
		} else {
			symsrc__destroy(ss);
1481
		}
1482

1483
	}
1484

1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	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;

1496 1497 1498
	if (syms_ss)
		ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
	else
1499 1500
		ret = -1;

1501
	if (ret > 0) {
1502 1503 1504 1505 1506
		int nr_plt;

		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
		if (nr_plt > 0)
			ret += nr_plt;
1507 1508
	}

1509 1510 1511
	for (; ss_pos > 0; ss_pos--)
		symsrc__destroy(&ss_[ss_pos - 1]);
out_free:
1512
	free(name);
1513
	if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1514 1515 1516 1517 1518
		ret = 0;
out:
	dso__set_loaded(dso, map->type);
	pthread_mutex_unlock(&dso->lock);

1519 1520 1521
	return ret;
}

1522
struct map *map_groups__find_by_name(struct map_groups *mg,
1523
				     enum map_type type, const char *name)
1524 1525 1526
{
	struct rb_node *nd;

1527
	for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1528 1529
		struct map *map = rb_entry(nd, struct map, rb_node);

1530
		if (map->dso && strcmp(map->dso->short_name, name) == 0)
1531 1532 1533 1534 1535 1536
			return map;
	}

	return NULL;
}

1537
int dso__load_vmlinux(struct dso *dso, struct map *map,
1538 1539
		      const char *vmlinux, bool vmlinux_allocated,
		      symbol_filter_t filter)
1540
{
1541 1542
	int err = -1;
	struct symsrc ss;
1543
	char symfs_vmlinux[PATH_MAX];
1544
	enum dso_binary_type symtab_type;
1545

1546 1547 1548
	if (vmlinux[0] == '/')
		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
	else
1549
		symbol__join_symfs(symfs_vmlinux, vmlinux);
1550

1551
	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1552
		symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1553
	else
1554
		symtab_type = DSO_BINARY_TYPE__VMLINUX;
1555

1556
	if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1557 1558
		return -1;

1559
	err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1560
	symsrc__destroy(&ss);
1561

1562
	if (err > 0) {
1563
		if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1564
			dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1565
		else
1566
			dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1567
		dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1568
		dso__set_loaded(dso, map->type);
1569
		pr_debug("Using %s for symbols\n", symfs_vmlinux);
1570
	}
1571

1572 1573 1574
	return err;
}

1575
int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1576
			   symbol_filter_t filter)
1577 1578
{
	int i, err = 0;
1579
	char *filename = NULL;
1580

1581 1582
	if (!symbol_conf.ignore_vmlinux_buildid)
		filename = dso__build_id_filename(dso, NULL, 0);
1583
	if (filename != NULL) {
1584 1585
		err = dso__load_vmlinux(dso, map, filename, true, filter);
		if (err > 0)
1586 1587 1588
			goto out;
		free(filename);
	}
1589

1590 1591 1592
	pr_debug("Looking at the vmlinux_path (%d entries long)\n",
		 vmlinux_path__nr_entries + 1);

1593
	for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1594 1595
		err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
		if (err > 0)
1596 1597
			break;
	}
1598
out:
1599 1600 1601
	return err;
}

1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
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);
1621
		if (!validate_kcore_addresses(kallsyms_filename, map)) {
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
			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);

1654 1655 1656
	scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
		  sbuild_id);

1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
	/* 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 */
1676
			if (!validate_kcore_addresses("/proc/kallsyms", map))
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
				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;
	}

1687 1688 1689 1690
	/* Find kallsyms in build-id cache with kcore */
	if (!find_matching_kcore(map, path, sizeof(path)))
		return strdup(path);

1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
	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");
}

1706
static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1707
				symbol_filter_t filter)
1708
{
1709
	int err;
1710 1711
	const char *kallsyms_filename = NULL;
	char *kallsyms_allocated_filename = NULL;
1712
	/*
1713 1714
	 * 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.
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
	 *
	 * 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.
	 */
1727 1728 1729 1730 1731
	if (symbol_conf.kallsyms_name != NULL) {
		kallsyms_filename = symbol_conf.kallsyms_name;
		goto do_kallsyms;
	}

1732
	if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1733 1734
		return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
					 false, filter);
1735
	}
1736

1737
	if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1738
		err = dso__load_vmlinux_path(dso, map, filter);
1739
		if (err > 0)
1740
			return err;
1741 1742
	}

1743 1744 1745 1746
	/* do not try local files if a symfs was given */
	if (symbol_conf.symfs[0] != 0)
		return -1;

1747 1748 1749
	kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
	if (!kallsyms_allocated_filename)
		return -1;
1750

1751
	kallsyms_filename = kallsyms_allocated_filename;
1752

1753
do_kallsyms:
1754
	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1755 1756
	if (err > 0)
		pr_debug("Using %s for symbols\n", kallsyms_filename);
1757
	free(kallsyms_allocated_filename);
1758

1759
	if (err > 0 && !dso__is_kcore(dso)) {
1760
		dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1761
		dso__set_long_name(dso, "[kernel.kallsyms]", false);
1762 1763
		map__fixup_start(map);
		map__fixup_end(map);
1764
	}
1765

1766 1767 1768
	return err;
}

1769 1770
static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
				      symbol_filter_t filter)
1771 1772 1773
{
	int err;
	const char *kallsyms_filename = NULL;
1774
	struct machine *machine;
1775 1776 1777 1778 1779 1780
	char path[PATH_MAX];

	if (!map->groups) {
		pr_debug("Guest kernel map hasn't the point to groups\n");
		return -1;
	}
1781
	machine = map->groups->machine;
1782

1783
	if (machine__is_default_guest(machine)) {
1784 1785 1786 1787 1788 1789
		/*
		 * 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) {
1790
			err = dso__load_vmlinux(dso, map,
1791 1792
						symbol_conf.default_guest_vmlinux_name,
						false, filter);
1793
			return err;
1794 1795 1796 1797 1798 1799
		}

		kallsyms_filename = symbol_conf.default_guest_kallsyms;
		if (!kallsyms_filename)
			return -1;
	} else {
1800
		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1801 1802 1803
		kallsyms_filename = path;
	}

1804
	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1805
	if (err > 0)
1806
		pr_debug("Using %s for symbols\n", kallsyms_filename);
1807
	if (err > 0 && !dso__is_kcore(dso)) {
1808
		dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1809
		machine__mmap_name(machine, path, sizeof(path));
1810
		dso__set_long_name(dso, strdup(path), true);
1811 1812 1813 1814 1815 1816
		map__fixup_start(map);
		map__fixup_end(map);
	}

	return err;
}
1817

1818 1819
static void vmlinux_path__exit(void)
{
1820 1821
	while (--vmlinux_path__nr_entries >= 0)
		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1822

1823
	zfree(&vmlinux_path);
1824 1825
}

1826
static int vmlinux_path__init(struct perf_session_env *env)
1827 1828 1829
{
	struct utsname uts;
	char bf[PATH_MAX];
1830
	char *kernel_version;
1831

1832
	vmlinux_path = malloc(sizeof(char *) * 6);
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
	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;
1844

1845
	/* only try kernel version if no symfs was given */
1846 1847 1848
	if (symbol_conf.symfs[0] != 0)
		return 0;

1849 1850 1851 1852 1853 1854 1855 1856
	if (env) {
		kernel_version = env->os_release;
	} else {
		if (uname(&uts) < 0)
			goto out_fail;

		kernel_version = uts.release;
	}
1857

1858
	snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1859 1860 1861 1862
	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
		goto out_fail;
	++vmlinux_path__nr_entries;
1863 1864 1865 1866 1867 1868
	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;
1869
	snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1870 1871 1872 1873 1874
	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",
1875
		 kernel_version);
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887
	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
1888
int setup_list(struct strlist **list, const char *list_str,
1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
		      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;
}

1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
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;
}

1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
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;
}

1935
int symbol__init(struct perf_session_env *env)
1936
{
1937 1938
	const char *symfs;

1939 1940 1941
	if (symbol_conf.initialized)
		return 0;

1942
	symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1943

1944 1945
	symbol__elf_init();

1946 1947 1948
	if (symbol_conf.sort_by_name)
		symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
					  sizeof(struct symbol));
1949

1950
	if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1951 1952
		return -1;

1953 1954 1955 1956 1957
	if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
		pr_err("'.' is the only non valid --field-separator argument\n");
		return -1;
	}

1958 1959 1960 1961 1962 1963 1964 1965
	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;

1966 1967 1968 1969 1970 1971 1972 1973
	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;

1974 1975
	if (setup_list(&symbol_conf.sym_list,
		       symbol_conf.sym_list_str, "symbol") < 0)
1976
		goto out_free_tid_list;
1977

1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
	/*
	 * 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);

1990 1991
	symbol_conf.kptr_restrict = symbol__read_kptr_restrict();

1992
	symbol_conf.initialized = true;
1993
	return 0;
1994

1995 1996 1997 1998
out_free_tid_list:
	intlist__delete(symbol_conf.tid_list);
out_free_pid_list:
	intlist__delete(symbol_conf.pid_list);
1999 2000
out_free_comm_list:
	strlist__delete(symbol_conf.comm_list);
2001 2002
out_free_dso_list:
	strlist__delete(symbol_conf.dso_list);
2003
	return -1;
2004 2005
}

2006 2007
void symbol__exit(void)
{
2008 2009
	if (!symbol_conf.initialized)
		return;
2010 2011 2012
	strlist__delete(symbol_conf.sym_list);
	strlist__delete(symbol_conf.dso_list);
	strlist__delete(symbol_conf.comm_list);
2013 2014
	intlist__delete(symbol_conf.tid_list);
	intlist__delete(symbol_conf.pid_list);
2015 2016
	vmlinux_path__exit();
	symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2017
	symbol_conf.initialized = false;
2018
}