linux_dsm_epyc7002/tools/perf/util/symbol.c
Mike Galbraith 508c4d0874 perf tools: Fix module symbol loading bug
Avi Kivity reported 'perf annotate' failures with modules, the
requested function was not annotated.

If there are no modules currently loaded, or the last module
scanned is not loaded, dso__load_modules() steps on the value from
dso__load_vmlinux(), so we happily load the kallsyms symbols on top
of what we've already loaded.

Fix that such that the total count of symbols loaded is returned.
Should module symbol load fail after parsing of vmlinux, is's a
hard failure, so do not silently fall-back to kallsyms.

Reported-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: rostedt@goodmis.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
LKML-Reference: <1253697658.11461.36.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-23 13:45:48 +02:00

1039 lines
21 KiB
C

#include "util.h"
#include "../perf.h"
#include "string.h"
#include "symbol.h"
#include "debug.h"
#include <libelf.h>
#include <gelf.h>
#include <elf.h>
const char *sym_hist_filter;
enum dso_origin {
DSO__ORIG_KERNEL = 0,
DSO__ORIG_JAVA_JIT,
DSO__ORIG_FEDORA,
DSO__ORIG_UBUNTU,
DSO__ORIG_BUILDID,
DSO__ORIG_DSO,
DSO__ORIG_NOT_FOUND,
};
static struct symbol *symbol__new(u64 start, u64 len,
const char *name, unsigned int priv_size,
u64 obj_start, int v)
{
size_t namelen = strlen(name) + 1;
struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
if (!self)
return NULL;
if (v >= 2)
printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
(u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
self->obj_start= obj_start;
self->hist = NULL;
self->hist_sum = 0;
if (sym_hist_filter && !strcmp(name, sym_hist_filter))
self->hist = calloc(sizeof(u64), len);
if (priv_size) {
memset(self, 0, priv_size);
self = ((void *)self) + priv_size;
}
self->start = start;
self->end = len ? start + len - 1 : start;
memcpy(self->name, name, namelen);
return self;
}
static void symbol__delete(struct symbol *self, unsigned int priv_size)
{
free(((void *)self) - priv_size);
}
static size_t symbol__fprintf(struct symbol *self, FILE *fp)
{
if (!self->module)
return fprintf(fp, " %llx-%llx %s\n",
self->start, self->end, self->name);
else
return fprintf(fp, " %llx-%llx %s \t[%s]\n",
self->start, self->end, self->name, self->module->name);
}
struct dso *dso__new(const char *name, unsigned int sym_priv_size)
{
struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
if (self != NULL) {
strcpy(self->name, name);
self->syms = RB_ROOT;
self->sym_priv_size = sym_priv_size;
self->find_symbol = dso__find_symbol;
self->slen_calculated = 0;
self->origin = DSO__ORIG_NOT_FOUND;
}
return self;
}
static void dso__delete_symbols(struct dso *self)
{
struct symbol *pos;
struct rb_node *next = rb_first(&self->syms);
while (next) {
pos = rb_entry(next, struct symbol, rb_node);
next = rb_next(&pos->rb_node);
rb_erase(&pos->rb_node, &self->syms);
symbol__delete(pos, self->sym_priv_size);
}
}
void dso__delete(struct dso *self)
{
dso__delete_symbols(self);
free(self);
}
static void dso__insert_symbol(struct dso *self, struct symbol *sym)
{
struct rb_node **p = &self->syms.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, &self->syms);
}
struct symbol *dso__find_symbol(struct dso *self, u64 ip)
{
struct rb_node *n;
if (self == NULL)
return NULL;
n = self->syms.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;
}
size_t dso__fprintf(struct dso *self, FILE *fp)
{
size_t ret = fprintf(fp, "dso: %s\n", self->name);
struct rb_node *nd;
for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
ret += symbol__fprintf(pos, fp);
}
return ret;
}
static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
{
struct rb_node *nd, *prevnd;
char *line = NULL;
size_t n;
FILE *file = fopen("/proc/kallsyms", "r");
int count = 0;
if (file == NULL)
goto out_failure;
while (!feof(file)) {
u64 start;
struct symbol *sym;
int line_len, len;
char symbol_type;
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;
symbol_type = toupper(line[len]);
/*
* We're interested only in code ('T'ext)
*/
if (symbol_type != 'T' && symbol_type != 'W')
continue;
/*
* Well fix up the end later, when we have all sorted.
*/
sym = symbol__new(start, 0xdead, line + len + 2,
self->sym_priv_size, 0, v);
if (sym == NULL)
goto out_delete_line;
if (filter && filter(self, sym))
symbol__delete(sym, self->sym_priv_size);
else {
dso__insert_symbol(self, sym);
count++;
}
}
/*
* Now that we have all sorted out, just set the ->end of all
* symbols
*/
prevnd = rb_first(&self->syms);
if (prevnd == NULL)
goto out_delete_line;
for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
*curr = rb_entry(nd, struct symbol, rb_node);
prev->end = curr->start - 1;
prevnd = nd;
}
free(line);
fclose(file);
return count;
out_delete_line:
free(line);
out_failure:
return -1;
}
static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int v)
{
char *line = NULL;
size_t n;
FILE *file;
int nr_syms = 0;
file = fopen(self->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, line + len,
self->sym_priv_size, start, v);
if (sym == NULL)
goto out_delete_line;
if (filter && filter(self, sym))
symbol__delete(sym, self->sym_priv_size);
else {
dso__insert_symbol(self, sym);
nr_syms++;
}
}
free(line);
fclose(file);
return nr_syms;
out_delete_line:
free(line);
out_failure:
return -1;
}
/**
* elf_symtab__for_each_symbol - iterate thru all the symbols
*
* @self: struct elf_symtab instance to iterate
* @idx: uint32_t idx
* @sym: GElf_Sym iterator
*/
#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
for (idx = 0, gelf_getsym(syms, idx, &sym);\
idx < nr_syms; \
idx++, gelf_getsym(syms, idx, &sym))
static inline uint8_t elf_sym__type(const GElf_Sym *sym)
{
return GELF_ST_TYPE(sym->st_info);
}
static inline int elf_sym__is_function(const GElf_Sym *sym)
{
return elf_sym__type(sym) == STT_FUNC &&
sym->st_name != 0 &&
sym->st_shndx != SHN_UNDEF &&
sym->st_size != 0;
}
static inline int elf_sym__is_label(const GElf_Sym *sym)
{
return elf_sym__type(sym) == STT_NOTYPE &&
sym->st_name != 0 &&
sym->st_shndx != SHN_UNDEF &&
sym->st_shndx != SHN_ABS;
}
static inline const char *elf_sec__name(const GElf_Shdr *shdr,
const Elf_Data *secstrs)
{
return secstrs->d_buf + shdr->sh_name;
}
static inline int elf_sec__is_text(const GElf_Shdr *shdr,
const Elf_Data *secstrs)
{
return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
}
static inline const char *elf_sym__name(const GElf_Sym *sym,
const Elf_Data *symstrs)
{
return symstrs->d_buf + sym->st_name;
}
static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
GElf_Shdr *shp, const char *name,
size_t *idx)
{
Elf_Scn *sec = NULL;
size_t cnt = 1;
while ((sec = elf_nextscn(elf, sec)) != NULL) {
char *str;
gelf_getshdr(sec, shp);
str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
if (!strcmp(name, str)) {
if (idx)
*idx = cnt;
break;
}
++cnt;
}
return sec;
}
#define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
idx < nr_entries; \
++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
#define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
idx < nr_entries; \
++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
/*
* We need to check if we have a .dynsym, so that we can handle the
* .plt, synthesizing its symbols, that aren't on the symtabs (be it
* .dynsym or .symtab).
* And always look at the original dso, not at debuginfo packages, that
* have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
*/
static int dso__synthesize_plt_symbols(struct dso *self, int v)
{
uint32_t nr_rel_entries, idx;
GElf_Sym sym;
u64 plt_offset;
GElf_Shdr shdr_plt;
struct symbol *f;
GElf_Shdr shdr_rel_plt, shdr_dynsym;
Elf_Data *reldata, *syms, *symstrs;
Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
size_t dynsym_idx;
GElf_Ehdr ehdr;
char sympltname[1024];
Elf *elf;
int nr = 0, symidx, fd, err = 0;
fd = open(self->name, O_RDONLY);
if (fd < 0)
goto out;
elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL)
goto out_close;
if (gelf_getehdr(elf, &ehdr) == NULL)
goto out_elf_end;
scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
".dynsym", &dynsym_idx);
if (scn_dynsym == NULL)
goto out_elf_end;
scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
".rela.plt", NULL);
if (scn_plt_rel == NULL) {
scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
".rel.plt", NULL);
if (scn_plt_rel == NULL)
goto out_elf_end;
}
err = -1;
if (shdr_rel_plt.sh_link != dynsym_idx)
goto out_elf_end;
if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
goto out_elf_end;
/*
* Fetch the relocation section to find the idxes to the GOT
* and the symbols in the .dynsym they refer to.
*/
reldata = elf_getdata(scn_plt_rel, NULL);
if (reldata == NULL)
goto out_elf_end;
syms = elf_getdata(scn_dynsym, NULL);
if (syms == NULL)
goto out_elf_end;
scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
if (scn_symstrs == NULL)
goto out_elf_end;
symstrs = elf_getdata(scn_symstrs, NULL);
if (symstrs == NULL)
goto out_elf_end;
nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
plt_offset = shdr_plt.sh_offset;
if (shdr_rel_plt.sh_type == SHT_RELA) {
GElf_Rela pos_mem, *pos;
elf_section__for_each_rela(reldata, pos, pos_mem, idx,
nr_rel_entries) {
symidx = GELF_R_SYM(pos->r_info);
plt_offset += shdr_plt.sh_entsize;
gelf_getsym(syms, symidx, &sym);
snprintf(sympltname, sizeof(sympltname),
"%s@plt", elf_sym__name(&sym, symstrs));
f = symbol__new(plt_offset, shdr_plt.sh_entsize,
sympltname, self->sym_priv_size, 0, v);
if (!f)
goto out_elf_end;
dso__insert_symbol(self, f);
++nr;
}
} else if (shdr_rel_plt.sh_type == SHT_REL) {
GElf_Rel pos_mem, *pos;
elf_section__for_each_rel(reldata, pos, pos_mem, idx,
nr_rel_entries) {
symidx = GELF_R_SYM(pos->r_info);
plt_offset += shdr_plt.sh_entsize;
gelf_getsym(syms, symidx, &sym);
snprintf(sympltname, sizeof(sympltname),
"%s@plt", elf_sym__name(&sym, symstrs));
f = symbol__new(plt_offset, shdr_plt.sh_entsize,
sympltname, self->sym_priv_size, 0, v);
if (!f)
goto out_elf_end;
dso__insert_symbol(self, f);
++nr;
}
}
err = 0;
out_elf_end:
elf_end(elf);
out_close:
close(fd);
if (err == 0)
return nr;
out:
fprintf(stderr, "%s: problems reading %s PLT info.\n",
__func__, self->name);
return 0;
}
static int dso__load_sym(struct dso *self, int fd, const char *name,
symbol_filter_t filter, int v, struct module *mod)
{
Elf_Data *symstrs, *secstrs;
uint32_t nr_syms;
int err = -1;
uint32_t idx;
GElf_Ehdr ehdr;
GElf_Shdr shdr;
Elf_Data *syms;
GElf_Sym sym;
Elf_Scn *sec, *sec_strndx;
Elf *elf;
int nr = 0, kernel = !strcmp("[kernel]", self->name);
elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL) {
if (v)
fprintf(stderr, "%s: cannot read %s ELF file.\n",
__func__, name);
goto out_close;
}
if (gelf_getehdr(elf, &ehdr) == NULL) {
if (v)
fprintf(stderr, "%s: cannot get elf header.\n", __func__);
goto out_elf_end;
}
sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
if (sec == NULL) {
sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
if (sec == NULL)
goto out_elf_end;
}
syms = elf_getdata(sec, NULL);
if (syms == NULL)
goto out_elf_end;
sec = elf_getscn(elf, shdr.sh_link);
if (sec == NULL)
goto out_elf_end;
symstrs = elf_getdata(sec, NULL);
if (symstrs == NULL)
goto out_elf_end;
sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
if (sec_strndx == NULL)
goto out_elf_end;
secstrs = elf_getdata(sec_strndx, NULL);
if (secstrs == NULL)
goto out_elf_end;
nr_syms = shdr.sh_size / shdr.sh_entsize;
memset(&sym, 0, sizeof(sym));
if (!kernel) {
self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
elf_section_by_name(elf, &ehdr, &shdr,
".gnu.prelink_undo",
NULL) != NULL);
} else self->adjust_symbols = 0;
elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
struct symbol *f;
const char *elf_name;
char *demangled;
u64 obj_start;
struct section *section = NULL;
int is_label = elf_sym__is_label(&sym);
const char *section_name;
if (!is_label && !elf_sym__is_function(&sym))
continue;
sec = elf_getscn(elf, sym.st_shndx);
if (!sec)
goto out_elf_end;
gelf_getshdr(sec, &shdr);
if (is_label && !elf_sec__is_text(&shdr, secstrs))
continue;
section_name = elf_sec__name(&shdr, secstrs);
obj_start = sym.st_value;
if (self->adjust_symbols) {
if (v >= 2)
printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
(u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
sym.st_value -= shdr.sh_addr - shdr.sh_offset;
}
if (mod) {
section = mod->sections->find_section(mod->sections, section_name);
if (section)
sym.st_value += section->vma;
else {
fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
mod->name, section_name);
goto out_elf_end;
}
}
/*
* We need to figure out if the object was created from C++ sources
* DWARF DW_compile_unit has this, but we don't always have access
* to it...
*/
elf_name = elf_sym__name(&sym, symstrs);
demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
if (demangled != NULL)
elf_name = demangled;
f = symbol__new(sym.st_value, sym.st_size, elf_name,
self->sym_priv_size, obj_start, v);
free(demangled);
if (!f)
goto out_elf_end;
if (filter && filter(self, f))
symbol__delete(f, self->sym_priv_size);
else {
f->module = mod;
dso__insert_symbol(self, f);
nr++;
}
}
err = nr;
out_elf_end:
elf_end(elf);
out_close:
return err;
}
#define BUILD_ID_SIZE 128
static char *dso__read_build_id(struct dso *self, int v)
{
int i;
GElf_Ehdr ehdr;
GElf_Shdr shdr;
Elf_Data *build_id_data;
Elf_Scn *sec;
char *build_id = NULL, *bid;
unsigned char *raw;
Elf *elf;
int fd = open(self->name, O_RDONLY);
if (fd < 0)
goto out;
elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL) {
if (v)
fprintf(stderr, "%s: cannot read %s ELF file.\n",
__func__, self->name);
goto out_close;
}
if (gelf_getehdr(elf, &ehdr) == NULL) {
if (v)
fprintf(stderr, "%s: cannot get elf header.\n", __func__);
goto out_elf_end;
}
sec = elf_section_by_name(elf, &ehdr, &shdr, ".note.gnu.build-id", NULL);
if (sec == NULL)
goto out_elf_end;
build_id_data = elf_getdata(sec, NULL);
if (build_id_data == NULL)
goto out_elf_end;
build_id = malloc(BUILD_ID_SIZE);
if (build_id == NULL)
goto out_elf_end;
raw = build_id_data->d_buf + 16;
bid = build_id;
for (i = 0; i < 20; ++i) {
sprintf(bid, "%02x", *raw);
++raw;
bid += 2;
}
if (v >= 2)
printf("%s(%s): %s\n", __func__, self->name, build_id);
out_elf_end:
elf_end(elf);
out_close:
close(fd);
out:
return build_id;
}
char dso__symtab_origin(const struct dso *self)
{
static const char origin[] = {
[DSO__ORIG_KERNEL] = 'k',
[DSO__ORIG_JAVA_JIT] = 'j',
[DSO__ORIG_FEDORA] = 'f',
[DSO__ORIG_UBUNTU] = 'u',
[DSO__ORIG_BUILDID] = 'b',
[DSO__ORIG_DSO] = 'd',
};
if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
return '!';
return origin[self->origin];
}
int dso__load(struct dso *self, symbol_filter_t filter, int v)
{
int size = PATH_MAX;
char *name = malloc(size), *build_id = NULL;
int ret = -1;
int fd;
if (!name)
return -1;
self->adjust_symbols = 0;
if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
ret = dso__load_perf_map(self, filter, v);
self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
DSO__ORIG_NOT_FOUND;
return ret;
}
self->origin = DSO__ORIG_FEDORA - 1;
more:
do {
self->origin++;
switch (self->origin) {
case DSO__ORIG_FEDORA:
snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
break;
case DSO__ORIG_UBUNTU:
snprintf(name, size, "/usr/lib/debug%s", self->name);
break;
case DSO__ORIG_BUILDID:
build_id = dso__read_build_id(self, v);
if (build_id != NULL) {
snprintf(name, size,
"/usr/lib/debug/.build-id/%.2s/%s.debug",
build_id, build_id + 2);
free(build_id);
break;
}
self->origin++;
/* Fall thru */
case DSO__ORIG_DSO:
snprintf(name, size, "%s", self->name);
break;
default:
goto out;
}
fd = open(name, O_RDONLY);
} while (fd < 0);
ret = dso__load_sym(self, fd, name, filter, v, NULL);
close(fd);
/*
* Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
*/
if (!ret)
goto more;
if (ret > 0) {
int nr_plt = dso__synthesize_plt_symbols(self, v);
if (nr_plt > 0)
ret += nr_plt;
}
out:
free(name);
if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
return 0;
return ret;
}
static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
symbol_filter_t filter, int v)
{
struct module *mod = mod_dso__find_module(mods, name);
int err = 0, fd;
if (mod == NULL || !mod->active)
return err;
fd = open(mod->path, O_RDONLY);
if (fd < 0)
return err;
err = dso__load_sym(self, fd, name, filter, v, mod);
close(fd);
return err;
}
int dso__load_modules(struct dso *self, symbol_filter_t filter, int v)
{
struct mod_dso *mods = mod_dso__new_dso("modules");
struct module *pos;
struct rb_node *next;
int err, count = 0;
err = mod_dso__load_modules(mods);
if (err <= 0)
return err;
/*
* Iterate over modules, and load active symbols.
*/
next = rb_first(&mods->mods);
while (next) {
pos = rb_entry(next, struct module, rb_node);
err = dso__load_module(self, mods, pos->name, filter, v);
if (err < 0)
break;
next = rb_next(&pos->rb_node);
count += err;
}
if (err < 0) {
mod_dso__delete_modules(mods);
mod_dso__delete_self(mods);
return err;
}
return count;
}
static inline void dso__fill_symbol_holes(struct dso *self)
{
struct symbol *prev = NULL;
struct rb_node *nd;
for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
if (prev) {
u64 hole = 0;
int alias = pos->start == prev->start;
if (!alias)
hole = prev->start - pos->end - 1;
if (hole || alias) {
if (alias)
pos->end = prev->end;
else if (hole)
pos->end = prev->start - 1;
}
}
prev = pos;
}
}
static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
symbol_filter_t filter, int v)
{
int err, fd = open(vmlinux, O_RDONLY);
if (fd < 0)
return -1;
err = dso__load_sym(self, fd, vmlinux, filter, v, NULL);
if (err > 0)
dso__fill_symbol_holes(self);
close(fd);
return err;
}
int dso__load_kernel(struct dso *self, const char *vmlinux,
symbol_filter_t filter, int v, int use_modules)
{
int err = -1;
if (vmlinux) {
err = dso__load_vmlinux(self, vmlinux, filter, v);
if (err > 0 && use_modules) {
int syms = dso__load_modules(self, filter, v);
if (syms < 0) {
fprintf(stderr, "dso__load_modules failed!\n");
return syms;
}
err += syms;
}
}
if (err <= 0)
err = dso__load_kallsyms(self, filter, v);
if (err > 0)
self->origin = DSO__ORIG_KERNEL;
return err;
}
LIST_HEAD(dsos);
struct dso *kernel_dso;
struct dso *vdso;
struct dso *hypervisor_dso;
const char *vmlinux_name = "vmlinux";
int modules;
static void dsos__add(struct dso *dso)
{
list_add_tail(&dso->node, &dsos);
}
static struct dso *dsos__find(const char *name)
{
struct dso *pos;
list_for_each_entry(pos, &dsos, node)
if (strcmp(pos->name, name) == 0)
return pos;
return NULL;
}
struct dso *dsos__findnew(const char *name)
{
struct dso *dso = dsos__find(name);
int nr;
if (dso)
return dso;
dso = dso__new(name, 0);
if (!dso)
goto out_delete_dso;
nr = dso__load(dso, NULL, verbose);
if (nr < 0) {
eprintf("Failed to open: %s\n", name);
goto out_delete_dso;
}
if (!nr)
eprintf("No symbols found in: %s, maybe install a debug package?\n", name);
dsos__add(dso);
return dso;
out_delete_dso:
dso__delete(dso);
return NULL;
}
void dsos__fprintf(FILE *fp)
{
struct dso *pos;
list_for_each_entry(pos, &dsos, node)
dso__fprintf(pos, fp);
}
static struct symbol *vdso__find_symbol(struct dso *dso, u64 ip)
{
return dso__find_symbol(dso, ip);
}
int load_kernel(void)
{
int err;
kernel_dso = dso__new("[kernel]", 0);
if (!kernel_dso)
return -1;
err = dso__load_kernel(kernel_dso, vmlinux_name, NULL, verbose, modules);
if (err <= 0) {
dso__delete(kernel_dso);
kernel_dso = NULL;
} else
dsos__add(kernel_dso);
vdso = dso__new("[vdso]", 0);
if (!vdso)
return -1;
vdso->find_symbol = vdso__find_symbol;
dsos__add(vdso);
hypervisor_dso = dso__new("[hypervisor]", 0);
if (!hypervisor_dso)
return -1;
dsos__add(hypervisor_dso);
return err;
}
void symbol__init(void)
{
elf_version(EV_CURRENT);
}