![David Ahern](/assets/img/avatar_default.png)
For some dsos (e.g., libc, libpthread, kernel modules) the symbol offset is huge. e.g., qemu-kvm 17238/17242 [007] 762235.640311: ffffffff816288a1 __schedule+0x451 ([kernel.kallsyms]) ffffffff81629609 schedule+0x29 ([kernel.kallsyms]) ffffffffa00a6ded kvm_vcpu_block+0xffffffffa00a106d (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00bae6b kvm_arch_vcpu_ioctl_run+0xffffffffa00a118b (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00a4d7a kvm_vcpu_ioctl+0xffffffffa00a141a (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffff811a7bdb do_vfs_ioctl+0x8b ([kernel.kallsyms]) ffffffff811a80c1 sys_ioctl+0x91 ([kernel.kallsyms]) ffffffff81633182 system_call+0x72 ([kernel.kallsyms]) 7f882a97af27 __GI___ioctl+0x7f882a891007 (/lib64/libc-2.14.90.so) 100000002 [unknown] ([unknown]) It seems to be maps with a non-0 start. Taking that into account the offsets are correct: qemu-kvm 17238/17242 [007] 762235.640311: ffffffff816288a1 __schedule+0x451 ([kernel.kallsyms]) ffffffff81629609 schedule+0x29 ([kernel.kallsyms]) ffffffffa00a6ded kvm_vcpu_block+0x6d (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00bae6b kvm_arch_vcpu_ioctl_run+0x18b (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00a4d7a kvm_vcpu_ioctl+0x41a (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffff811a7bdb do_vfs_ioctl+0x8b ([kernel.kallsyms]) ffffffff811a80c1 sys_ioctl+0x91 ([kernel.kallsyms]) ffffffff81633182 system_call+0x72 ([kernel.kallsyms]) 7f882a97af27 __GI___ioctl+0x7 (/lib64/libc-2.14.90.so) 100000002 [unknown] ([unknown]) Signed-off-by: David Ahern <dsahern@gmail.com> Link: http://lkml.kernel.org/r/1375026512-45826-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1510 lines
34 KiB
C
1510 lines
34 KiB
C
#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>
|
|
#include <inttypes.h>
|
|
#include "build-id.h"
|
|
#include "util.h"
|
|
#include "debug.h"
|
|
#include "machine.h"
|
|
#include "symbol.h"
|
|
#include "strlist.h"
|
|
|
|
#include <elf.h>
|
|
#include <limits.h>
|
|
#include <sys/utsname.h>
|
|
|
|
#ifndef KSYM_NAME_LEN
|
|
#define KSYM_NAME_LEN 256
|
|
#endif
|
|
|
|
static int dso__load_kernel_sym(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter);
|
|
static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter);
|
|
int vmlinux_path__nr_entries;
|
|
char **vmlinux_path;
|
|
|
|
struct symbol_conf symbol_conf = {
|
|
.use_modules = true,
|
|
.try_vmlinux_path = true,
|
|
.annotate_src = true,
|
|
.demangle = true,
|
|
.symfs = "",
|
|
};
|
|
|
|
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,
|
|
DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
|
|
DSO_BINARY_TYPE__NOT_FOUND,
|
|
};
|
|
|
|
#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
|
|
|
|
bool symbol_type__is_a(char symbol_type, enum map_type map_type)
|
|
{
|
|
symbol_type = toupper(symbol_type);
|
|
|
|
switch (map_type) {
|
|
case MAP__FUNCTION:
|
|
return symbol_type == 'T' || symbol_type == 'W';
|
|
case MAP__VARIABLE:
|
|
return symbol_type == 'D';
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
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;
|
|
size_t na, nb;
|
|
|
|
/* 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;
|
|
|
|
/* Choose the symbol with the longest name */
|
|
na = strlen(syma->name);
|
|
nb = strlen(symb->name);
|
|
if (na > nb)
|
|
return SYMBOL_A;
|
|
else if (na < nb)
|
|
return SYMBOL_B;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
void symbols__fixup_duplicate(struct rb_root *symbols)
|
|
{
|
|
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);
|
|
goto again;
|
|
} else {
|
|
nd = rb_next(&curr->rb_node);
|
|
rb_erase(&curr->rb_node, symbols);
|
|
}
|
|
}
|
|
}
|
|
|
|
void symbols__fixup_end(struct rb_root *symbols)
|
|
{
|
|
struct rb_node *nd, *prevnd = rb_first(symbols);
|
|
struct symbol *curr, *prev;
|
|
|
|
if (prevnd == NULL)
|
|
return;
|
|
|
|
curr = rb_entry(prevnd, struct symbol, rb_node);
|
|
|
|
for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
|
|
prev = curr;
|
|
curr = rb_entry(nd, struct symbol, rb_node);
|
|
|
|
if (prev->end == prev->start && prev->end != curr->start)
|
|
prev->end = curr->start - 1;
|
|
}
|
|
|
|
/* Last entry */
|
|
if (curr->end == curr->start)
|
|
curr->end = roundup(curr->start, 4096);
|
|
}
|
|
|
|
void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
|
|
{
|
|
struct map *prev, *curr;
|
|
struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
|
|
|
|
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);
|
|
prev->end = curr->start - 1;
|
|
}
|
|
|
|
/*
|
|
* We still haven't the actual symbols, so guess the
|
|
* last map final address.
|
|
*/
|
|
curr->end = ~0ULL;
|
|
}
|
|
|
|
struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
|
|
{
|
|
size_t namelen = strlen(name) + 1;
|
|
struct symbol *sym = calloc(1, (symbol_conf.priv_size +
|
|
sizeof(*sym) + namelen));
|
|
if (sym == NULL)
|
|
return NULL;
|
|
|
|
if (symbol_conf.priv_size)
|
|
sym = ((void *)sym) + symbol_conf.priv_size;
|
|
|
|
sym->start = start;
|
|
sym->end = len ? start + len - 1 : start;
|
|
sym->binding = binding;
|
|
sym->namelen = namelen - 1;
|
|
|
|
pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
|
|
__func__, name, start, sym->end);
|
|
memcpy(sym->name, name, namelen);
|
|
|
|
return sym;
|
|
}
|
|
|
|
void symbol__delete(struct symbol *sym)
|
|
{
|
|
free(((void *)sym) - symbol_conf.priv_size);
|
|
}
|
|
|
|
size_t symbol__fprintf(struct symbol *sym, FILE *fp)
|
|
{
|
|
return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
|
|
sym->start, sym->end,
|
|
sym->binding == STB_GLOBAL ? 'g' :
|
|
sym->binding == STB_LOCAL ? 'l' : 'w',
|
|
sym->name);
|
|
}
|
|
|
|
size_t symbol__fprintf_symname_offs(const struct symbol *sym,
|
|
const struct addr_location *al, FILE *fp)
|
|
{
|
|
unsigned long offset;
|
|
size_t length;
|
|
|
|
if (sym && sym->name) {
|
|
length = fprintf(fp, "%s", sym->name);
|
|
if (al) {
|
|
if (al->addr < sym->end)
|
|
offset = al->addr - sym->start;
|
|
else
|
|
offset = al->addr - al->map->start - sym->start;
|
|
length += fprintf(fp, "+0x%lx", offset);
|
|
}
|
|
return length;
|
|
} else
|
|
return fprintf(fp, "[unknown]");
|
|
}
|
|
|
|
size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
|
|
{
|
|
return symbol__fprintf_symname_offs(sym, NULL, fp);
|
|
}
|
|
|
|
void symbols__delete(struct rb_root *symbols)
|
|
{
|
|
struct symbol *pos;
|
|
struct rb_node *next = rb_first(symbols);
|
|
|
|
while (next) {
|
|
pos = rb_entry(next, struct symbol, rb_node);
|
|
next = rb_next(&pos->rb_node);
|
|
rb_erase(&pos->rb_node, symbols);
|
|
symbol__delete(pos);
|
|
}
|
|
}
|
|
|
|
void symbols__insert(struct rb_root *symbols, struct symbol *sym)
|
|
{
|
|
struct rb_node **p = &symbols->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
const u64 ip = sym->start;
|
|
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);
|
|
rb_insert_color(&sym->rb_node, symbols);
|
|
}
|
|
|
|
static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
|
|
{
|
|
struct rb_node *n;
|
|
|
|
if (symbols == NULL)
|
|
return NULL;
|
|
|
|
n = symbols->rb_node;
|
|
|
|
while (n) {
|
|
struct symbol *s = rb_entry(n, struct symbol, rb_node);
|
|
|
|
if (ip < s->start)
|
|
n = n->rb_left;
|
|
else if (ip > s->end)
|
|
n = n->rb_right;
|
|
else
|
|
return s;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
struct symbol_name_rb_node {
|
|
struct rb_node rb_node;
|
|
struct symbol sym;
|
|
};
|
|
|
|
static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
|
|
{
|
|
struct rb_node **p = &symbols->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct symbol_name_rb_node *symn, *s;
|
|
|
|
symn = container_of(sym, struct symbol_name_rb_node, sym);
|
|
|
|
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);
|
|
rb_insert_color(&symn->rb_node, symbols);
|
|
}
|
|
|
|
static void symbols__sort_by_name(struct rb_root *symbols,
|
|
struct rb_root *source)
|
|
{
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first(source); nd; nd = rb_next(nd)) {
|
|
struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
|
|
symbols__insert_by_name(symbols, pos);
|
|
}
|
|
}
|
|
|
|
static struct symbol *symbols__find_by_name(struct rb_root *symbols,
|
|
const char *name)
|
|
{
|
|
struct rb_node *n;
|
|
|
|
if (symbols == NULL)
|
|
return NULL;
|
|
|
|
n = symbols->rb_node;
|
|
|
|
while (n) {
|
|
struct symbol_name_rb_node *s;
|
|
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
|
|
return &s->sym;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct symbol *dso__find_symbol(struct dso *dso,
|
|
enum map_type type, u64 addr)
|
|
{
|
|
return symbols__find(&dso->symbols[type], addr);
|
|
}
|
|
|
|
struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
|
|
{
|
|
return symbols__first(&dso->symbols[type]);
|
|
}
|
|
|
|
struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
|
|
const char *name)
|
|
{
|
|
return symbols__find_by_name(&dso->symbol_names[type], name);
|
|
}
|
|
|
|
void dso__sort_by_name(struct dso *dso, enum map_type type)
|
|
{
|
|
dso__set_sorted_by_name(dso, type);
|
|
return symbols__sort_by_name(&dso->symbol_names[type],
|
|
&dso->symbols[type]);
|
|
}
|
|
|
|
size_t dso__fprintf_symbols_by_name(struct dso *dso,
|
|
enum map_type type, FILE *fp)
|
|
{
|
|
size_t ret = 0;
|
|
struct rb_node *nd;
|
|
struct symbol_name_rb_node *pos;
|
|
|
|
for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
|
|
pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
|
|
fprintf(fp, "%s\n", pos->sym.name);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kallsyms__parse(const char *filename, void *arg,
|
|
int (*process_symbol)(void *arg, const char *name,
|
|
char type, u64 start))
|
|
{
|
|
char *line = NULL;
|
|
size_t n;
|
|
int err = -1;
|
|
FILE *file = fopen(filename, "r");
|
|
|
|
if (file == NULL)
|
|
goto out_failure;
|
|
|
|
err = 0;
|
|
|
|
while (!feof(file)) {
|
|
u64 start;
|
|
int line_len, len;
|
|
char symbol_type;
|
|
char *symbol_name;
|
|
|
|
line_len = getline(&line, &n, file);
|
|
if (line_len < 0 || !line)
|
|
break;
|
|
|
|
line[--line_len] = '\0'; /* \n */
|
|
|
|
len = hex2u64(line, &start);
|
|
|
|
len++;
|
|
if (len + 2 >= line_len)
|
|
continue;
|
|
|
|
symbol_type = line[len];
|
|
len += 2;
|
|
symbol_name = line + len;
|
|
len = line_len - len;
|
|
|
|
if (len >= KSYM_NAME_LEN) {
|
|
err = -1;
|
|
break;
|
|
}
|
|
|
|
err = process_symbol(arg, symbol_name,
|
|
symbol_type, start);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
free(line);
|
|
fclose(file);
|
|
return err;
|
|
|
|
out_failure:
|
|
return -1;
|
|
}
|
|
|
|
struct process_kallsyms_args {
|
|
struct map *map;
|
|
struct dso *dso;
|
|
};
|
|
|
|
static u8 kallsyms2elf_type(char type)
|
|
{
|
|
if (type == 'W')
|
|
return STB_WEAK;
|
|
|
|
return isupper(type) ? STB_GLOBAL : STB_LOCAL;
|
|
}
|
|
|
|
static int map__process_kallsym_symbol(void *arg, const char *name,
|
|
char type, u64 start)
|
|
{
|
|
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;
|
|
|
|
/*
|
|
* 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);
|
|
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);
|
|
|
|
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.
|
|
*/
|
|
static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
|
|
struct map *map)
|
|
{
|
|
struct process_kallsyms_args args = { .map = map, .dso = dso, };
|
|
return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
|
|
}
|
|
|
|
static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
struct map_groups *kmaps = map__kmap(map)->kmaps;
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int dso__split_kallsyms(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
struct map_groups *kmaps = map__kmap(map)->kmaps;
|
|
struct machine *machine = kmaps->machine;
|
|
struct map *curr_map = map;
|
|
struct symbol *pos;
|
|
int count = 0, moved = 0;
|
|
struct rb_root *root = &dso->symbols[map->type];
|
|
struct rb_node *next = rb_first(root);
|
|
int kernel_range = 0;
|
|
|
|
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) {
|
|
if (!symbol_conf.use_modules)
|
|
goto discard_symbol;
|
|
|
|
*module++ = '\0';
|
|
|
|
if (strcmp(curr_map->dso->short_name, module)) {
|
|
if (curr_map != map &&
|
|
dso->kernel == DSO_TYPE_GUEST_KERNEL &&
|
|
machine__is_default_guest(machine)) {
|
|
/*
|
|
* 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);
|
|
if (curr_map == NULL) {
|
|
pr_debug("%s/proc/{kallsyms,modules} "
|
|
"inconsistency while looking "
|
|
"for \"%s\" module!\n",
|
|
machine->root_dir, module);
|
|
curr_map = map;
|
|
goto discard_symbol;
|
|
}
|
|
|
|
if (curr_map->dso->loaded &&
|
|
!machine__is_default_guest(machine))
|
|
goto discard_symbol;
|
|
}
|
|
/*
|
|
* So that we look just like we get from .ko files,
|
|
* i.e. not prelinked, relative to map->start.
|
|
*/
|
|
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) {
|
|
char dso_name[PATH_MAX];
|
|
struct dso *ndso;
|
|
|
|
if (count == 0) {
|
|
curr_map = map;
|
|
goto filter_symbol;
|
|
}
|
|
|
|
if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
|
|
snprintf(dso_name, sizeof(dso_name),
|
|
"[guest.kernel].%d",
|
|
kernel_range++);
|
|
else
|
|
snprintf(dso_name, sizeof(dso_name),
|
|
"[kernel].%d",
|
|
kernel_range++);
|
|
|
|
ndso = dso__new(dso_name);
|
|
if (ndso == NULL)
|
|
return -1;
|
|
|
|
ndso->kernel = dso->kernel;
|
|
|
|
curr_map = map__new2(pos->start, ndso, map->type);
|
|
if (curr_map == NULL) {
|
|
dso__delete(ndso);
|
|
return -1;
|
|
}
|
|
|
|
curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
|
|
map_groups__insert(kmaps, curr_map);
|
|
++kernel_range;
|
|
}
|
|
filter_symbol:
|
|
if (filter && filter(curr_map, pos)) {
|
|
discard_symbol: rb_erase(&pos->rb_node, root);
|
|
symbol__delete(pos);
|
|
} else {
|
|
if (curr_map != map) {
|
|
rb_erase(&pos->rb_node, root);
|
|
symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
|
|
++moved;
|
|
} else
|
|
++count;
|
|
}
|
|
}
|
|
|
|
if (curr_map != map &&
|
|
dso->kernel == DSO_TYPE_GUEST_KERNEL &&
|
|
machine__is_default_guest(kmaps->machine)) {
|
|
dso__set_loaded(curr_map->dso, curr_map->type);
|
|
}
|
|
|
|
return count + moved;
|
|
}
|
|
|
|
bool symbol__restricted_filename(const char *filename,
|
|
const char *restricted_filename)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* If kallsyms is referenced by name then we look for kcore in the same
|
|
* directory.
|
|
*/
|
|
static bool kcore_filename_from_kallsyms_filename(char *kcore_filename,
|
|
const char *kallsyms_filename)
|
|
{
|
|
char *name;
|
|
|
|
strcpy(kcore_filename, kallsyms_filename);
|
|
name = strrchr(kcore_filename, '/');
|
|
if (!name)
|
|
return false;
|
|
|
|
if (!strcmp(name, "/kallsyms")) {
|
|
strcpy(name, "/kcore");
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int dso__load_kcore(struct dso *dso, struct map *map,
|
|
const char *kallsyms_filename)
|
|
{
|
|
struct map_groups *kmaps = map__kmap(map)->kmaps;
|
|
struct machine *machine = kmaps->machine;
|
|
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;
|
|
|
|
/* This function requires that the map is the kernel map */
|
|
if (map != machine->vmlinux_maps[map->type])
|
|
return -EINVAL;
|
|
|
|
if (!kcore_filename_from_kallsyms_filename(kcore_filename,
|
|
kallsyms_filename))
|
|
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;
|
|
|
|
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)
|
|
dso->data_type = DSO_BINARY_TYPE__GUEST_KCORE;
|
|
else
|
|
dso->data_type = DSO_BINARY_TYPE__KCORE;
|
|
dso__set_long_name(dso, strdup(kcore_filename));
|
|
|
|
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;
|
|
}
|
|
|
|
int dso__load_kallsyms(struct dso *dso, const char *filename,
|
|
struct map *map, symbol_filter_t filter)
|
|
{
|
|
if (symbol__restricted_filename(filename, "/proc/kallsyms"))
|
|
return -1;
|
|
|
|
if (dso__load_all_kallsyms(dso, filename, map) < 0)
|
|
return -1;
|
|
|
|
symbols__fixup_duplicate(&dso->symbols[map->type]);
|
|
symbols__fixup_end(&dso->symbols[map->type]);
|
|
|
|
if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
|
|
dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
|
|
else
|
|
dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
|
|
|
|
if (!dso__load_kcore(dso, map, filename))
|
|
return dso__split_kallsyms_for_kcore(dso, map, filter);
|
|
else
|
|
return dso__split_kallsyms(dso, map, filter);
|
|
}
|
|
|
|
static int dso__load_perf_map(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
char *line = NULL;
|
|
size_t n;
|
|
FILE *file;
|
|
int nr_syms = 0;
|
|
|
|
file = fopen(dso->long_name, "r");
|
|
if (file == NULL)
|
|
goto out_failure;
|
|
|
|
while (!feof(file)) {
|
|
u64 start, size;
|
|
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;
|
|
|
|
sym = symbol__new(start, size, STB_GLOBAL, line + len);
|
|
|
|
if (sym == NULL)
|
|
goto out_delete_line;
|
|
|
|
if (filter && filter(map, sym))
|
|
symbol__delete(sym);
|
|
else {
|
|
symbols__insert(&dso->symbols[map->type], sym);
|
|
nr_syms++;
|
|
}
|
|
}
|
|
|
|
free(line);
|
|
fclose(file);
|
|
|
|
return nr_syms;
|
|
|
|
out_delete_line:
|
|
free(line);
|
|
out_failure:
|
|
return -1;
|
|
}
|
|
|
|
int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
|
|
{
|
|
char *name;
|
|
int ret = -1;
|
|
u_int i;
|
|
struct machine *machine;
|
|
char *root_dir = (char *) "";
|
|
int ss_pos = 0;
|
|
struct symsrc ss_[2];
|
|
struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
|
|
|
|
dso__set_loaded(dso, map->type);
|
|
|
|
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);
|
|
|
|
if (map->groups && map->groups->machine)
|
|
machine = map->groups->machine;
|
|
else
|
|
machine = NULL;
|
|
|
|
dso->adjust_symbols = 0;
|
|
|
|
if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
|
|
struct stat st;
|
|
|
|
if (lstat(dso->name, &st) < 0)
|
|
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;
|
|
}
|
|
|
|
ret = dso__load_perf_map(dso, map, filter);
|
|
dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
|
|
DSO_BINARY_TYPE__NOT_FOUND;
|
|
return ret;
|
|
}
|
|
|
|
if (machine)
|
|
root_dir = machine->root_dir;
|
|
|
|
name = malloc(PATH_MAX);
|
|
if (!name)
|
|
return -1;
|
|
|
|
/* Iterate over candidate debug images.
|
|
* Keep track of "interesting" ones (those which have a symtab, dynsym,
|
|
* and/or opd section) for processing.
|
|
*/
|
|
for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
|
|
struct symsrc *ss = &ss_[ss_pos];
|
|
bool next_slot = false;
|
|
|
|
enum dso_binary_type symtab_type = binary_type_symtab[i];
|
|
|
|
if (dso__binary_type_file(dso, symtab_type,
|
|
root_dir, name, PATH_MAX))
|
|
continue;
|
|
|
|
/* Name is now the name of the next image to try */
|
|
if (symsrc__init(ss, dso, name, symtab_type) < 0)
|
|
continue;
|
|
|
|
if (!syms_ss && symsrc__has_symtab(ss)) {
|
|
syms_ss = ss;
|
|
next_slot = true;
|
|
}
|
|
|
|
if (!runtime_ss && symsrc__possibly_runtime(ss)) {
|
|
runtime_ss = ss;
|
|
next_slot = true;
|
|
}
|
|
|
|
if (next_slot) {
|
|
ss_pos++;
|
|
|
|
if (syms_ss && runtime_ss)
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
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;
|
|
|
|
if (syms_ss) {
|
|
int km;
|
|
|
|
km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
|
|
dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
|
|
ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km);
|
|
} else {
|
|
ret = -1;
|
|
}
|
|
|
|
if (ret > 0) {
|
|
int nr_plt;
|
|
|
|
nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
|
|
if (nr_plt > 0)
|
|
ret += nr_plt;
|
|
}
|
|
|
|
for (; ss_pos > 0; ss_pos--)
|
|
symsrc__destroy(&ss_[ss_pos - 1]);
|
|
out_free:
|
|
free(name);
|
|
if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
|
|
struct map *map_groups__find_by_name(struct map_groups *mg,
|
|
enum map_type type, const char *name)
|
|
{
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
|
|
struct map *map = rb_entry(nd, struct map, rb_node);
|
|
|
|
if (map->dso && strcmp(map->dso->short_name, name) == 0)
|
|
return map;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int dso__load_vmlinux(struct dso *dso, struct map *map,
|
|
const char *vmlinux, symbol_filter_t filter)
|
|
{
|
|
int err = -1;
|
|
struct symsrc ss;
|
|
char symfs_vmlinux[PATH_MAX];
|
|
enum dso_binary_type symtab_type;
|
|
|
|
if (vmlinux[0] == '/')
|
|
snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
|
|
else
|
|
snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
|
|
symbol_conf.symfs, vmlinux);
|
|
|
|
if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
|
|
symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
|
|
else
|
|
symtab_type = DSO_BINARY_TYPE__VMLINUX;
|
|
|
|
if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
|
|
return -1;
|
|
|
|
err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
|
|
symsrc__destroy(&ss);
|
|
|
|
if (err > 0) {
|
|
if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
|
|
dso->data_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
|
|
else
|
|
dso->data_type = DSO_BINARY_TYPE__VMLINUX;
|
|
dso__set_long_name(dso, (char *)vmlinux);
|
|
dso__set_loaded(dso, map->type);
|
|
pr_debug("Using %s for symbols\n", symfs_vmlinux);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int dso__load_vmlinux_path(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
int i, err = 0;
|
|
char *filename;
|
|
|
|
pr_debug("Looking at the vmlinux_path (%d entries long)\n",
|
|
vmlinux_path__nr_entries + 1);
|
|
|
|
filename = dso__build_id_filename(dso, NULL, 0);
|
|
if (filename != NULL) {
|
|
err = dso__load_vmlinux(dso, map, filename, filter);
|
|
if (err > 0) {
|
|
dso->lname_alloc = 1;
|
|
goto out;
|
|
}
|
|
free(filename);
|
|
}
|
|
|
|
for (i = 0; i < vmlinux_path__nr_entries; ++i) {
|
|
err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
|
|
if (err > 0) {
|
|
dso__set_long_name(dso, strdup(vmlinux_path[i]));
|
|
dso->lname_alloc = 1;
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int dso__load_kernel_sym(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
int err;
|
|
const char *kallsyms_filename = NULL;
|
|
char *kallsyms_allocated_filename = NULL;
|
|
/*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*/
|
|
if (symbol_conf.kallsyms_name != NULL) {
|
|
kallsyms_filename = symbol_conf.kallsyms_name;
|
|
goto do_kallsyms;
|
|
}
|
|
|
|
if (symbol_conf.vmlinux_name != NULL) {
|
|
err = dso__load_vmlinux(dso, map,
|
|
symbol_conf.vmlinux_name, filter);
|
|
if (err > 0) {
|
|
dso__set_long_name(dso,
|
|
strdup(symbol_conf.vmlinux_name));
|
|
dso->lname_alloc = 1;
|
|
return err;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
if (vmlinux_path != NULL) {
|
|
err = dso__load_vmlinux_path(dso, map, filter);
|
|
if (err > 0)
|
|
return err;
|
|
}
|
|
|
|
/* do not try local files if a symfs was given */
|
|
if (symbol_conf.symfs[0] != 0)
|
|
return -1;
|
|
|
|
/*
|
|
* Say the kernel DSO was created when processing the build-id header table,
|
|
* we have a build-id, so check if it is the same as the running kernel,
|
|
* using it if it is.
|
|
*/
|
|
if (dso->has_build_id) {
|
|
u8 kallsyms_build_id[BUILD_ID_SIZE];
|
|
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
|
|
|
|
if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
|
|
sizeof(kallsyms_build_id)) == 0) {
|
|
if (dso__build_id_equal(dso, kallsyms_build_id)) {
|
|
kallsyms_filename = "/proc/kallsyms";
|
|
goto do_kallsyms;
|
|
}
|
|
}
|
|
/*
|
|
* Now look if we have it on the build-id cache in
|
|
* $HOME/.debug/[kernel.kallsyms].
|
|
*/
|
|
build_id__sprintf(dso->build_id, sizeof(dso->build_id),
|
|
sbuild_id);
|
|
|
|
if (asprintf(&kallsyms_allocated_filename,
|
|
"%s/.debug/[kernel.kallsyms]/%s",
|
|
getenv("HOME"), sbuild_id) == -1) {
|
|
pr_err("Not enough memory for kallsyms file lookup\n");
|
|
return -1;
|
|
}
|
|
|
|
kallsyms_filename = kallsyms_allocated_filename;
|
|
|
|
if (access(kallsyms_filename, F_OK)) {
|
|
pr_err("No kallsyms or vmlinux with build-id %s "
|
|
"was found\n", sbuild_id);
|
|
free(kallsyms_allocated_filename);
|
|
return -1;
|
|
}
|
|
} else {
|
|
/*
|
|
* Last resort, if we don't have a build-id and couldn't find
|
|
* any vmlinux file, try the running kernel kallsyms table.
|
|
*/
|
|
kallsyms_filename = "/proc/kallsyms";
|
|
}
|
|
|
|
do_kallsyms:
|
|
err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
|
|
if (err > 0)
|
|
pr_debug("Using %s for symbols\n", kallsyms_filename);
|
|
free(kallsyms_allocated_filename);
|
|
|
|
if (err > 0 && !dso__is_kcore(dso)) {
|
|
dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
|
|
map__fixup_start(map);
|
|
map__fixup_end(map);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
int err;
|
|
const char *kallsyms_filename = NULL;
|
|
struct machine *machine;
|
|
char path[PATH_MAX];
|
|
|
|
if (!map->groups) {
|
|
pr_debug("Guest kernel map hasn't the point to groups\n");
|
|
return -1;
|
|
}
|
|
machine = map->groups->machine;
|
|
|
|
if (machine__is_default_guest(machine)) {
|
|
/*
|
|
* 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) {
|
|
err = dso__load_vmlinux(dso, map,
|
|
symbol_conf.default_guest_vmlinux_name, filter);
|
|
return err;
|
|
}
|
|
|
|
kallsyms_filename = symbol_conf.default_guest_kallsyms;
|
|
if (!kallsyms_filename)
|
|
return -1;
|
|
} else {
|
|
sprintf(path, "%s/proc/kallsyms", machine->root_dir);
|
|
kallsyms_filename = path;
|
|
}
|
|
|
|
err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
|
|
if (err > 0)
|
|
pr_debug("Using %s for symbols\n", kallsyms_filename);
|
|
if (err > 0 && !dso__is_kcore(dso)) {
|
|
machine__mmap_name(machine, path, sizeof(path));
|
|
dso__set_long_name(dso, strdup(path));
|
|
map__fixup_start(map);
|
|
map__fixup_end(map);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void vmlinux_path__exit(void)
|
|
{
|
|
while (--vmlinux_path__nr_entries >= 0) {
|
|
free(vmlinux_path[vmlinux_path__nr_entries]);
|
|
vmlinux_path[vmlinux_path__nr_entries] = NULL;
|
|
}
|
|
|
|
free(vmlinux_path);
|
|
vmlinux_path = NULL;
|
|
}
|
|
|
|
static int vmlinux_path__init(void)
|
|
{
|
|
struct utsname uts;
|
|
char bf[PATH_MAX];
|
|
|
|
vmlinux_path = malloc(sizeof(char *) * 5);
|
|
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;
|
|
|
|
/* only try running kernel version if no symfs was given */
|
|
if (symbol_conf.symfs[0] != 0)
|
|
return 0;
|
|
|
|
if (uname(&uts) < 0)
|
|
return -1;
|
|
|
|
snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
|
|
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), "/lib/modules/%s/build/vmlinux", uts.release);
|
|
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",
|
|
uts.release);
|
|
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;
|
|
}
|
|
|
|
static int setup_list(struct strlist **list, const char *list_str,
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int symbol__init(void)
|
|
{
|
|
const char *symfs;
|
|
|
|
if (symbol_conf.initialized)
|
|
return 0;
|
|
|
|
symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
|
|
|
|
symbol__elf_init();
|
|
|
|
if (symbol_conf.sort_by_name)
|
|
symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
|
|
sizeof(struct symbol));
|
|
|
|
if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
|
|
return -1;
|
|
|
|
if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
|
|
pr_err("'.' is the only non valid --field-separator argument\n");
|
|
return -1;
|
|
}
|
|
|
|
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;
|
|
|
|
if (setup_list(&symbol_conf.sym_list,
|
|
symbol_conf.sym_list_str, "symbol") < 0)
|
|
goto out_free_comm_list;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
|
|
|
|
symbol_conf.initialized = true;
|
|
return 0;
|
|
|
|
out_free_comm_list:
|
|
strlist__delete(symbol_conf.comm_list);
|
|
out_free_dso_list:
|
|
strlist__delete(symbol_conf.dso_list);
|
|
return -1;
|
|
}
|
|
|
|
void symbol__exit(void)
|
|
{
|
|
if (!symbol_conf.initialized)
|
|
return;
|
|
strlist__delete(symbol_conf.sym_list);
|
|
strlist__delete(symbol_conf.dso_list);
|
|
strlist__delete(symbol_conf.comm_list);
|
|
vmlinux_path__exit();
|
|
symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
|
|
symbol_conf.initialized = false;
|
|
}
|