static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
Dwarf_Word *data)
{
struct addr_location al;
ssize_t size;
thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__FUNCTION, addr, &al);
if (!al.map) {
/*
* We've seen cases (softice) where DWARF unwinder went
* through non executable mmaps, which we need to lookup
* in MAP__VARIABLE tree.
*/
thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__VARIABLE, addr, &al);
}
if (!al.map) {
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
return -1;
}
if (!al.map->dso)
return -1;
size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
addr, (u8 *) data, sizeof(*data));
return !(size == sizeof(*data));
}
static int mmap_events(synth_cb synth)
{
struct machines machines;
struct machine *machine;
int err, i;
/*
* The threads_create will not return before all threads
* are spawned and all created memory map.
*
* They will loop until threads_destroy is called, so we
* can safely run synthesizing function.
*/
TEST_ASSERT_VAL("failed to create threads", !threads_create());
machines__init(&machines);
machine = &machines.host;
dump_trace = verbose > 1 ? 1 : 0;
err = synth(machine);
dump_trace = 0;
TEST_ASSERT_VAL("failed to destroy threads", !threads_destroy());
TEST_ASSERT_VAL("failed to synthesize maps", !err);
/*
* All data is synthesized, try to find map for each
* thread object.
*/
for (i = 0; i < THREADS; i++) {
struct thread_data *td = &threads[i];
struct addr_location al;
struct thread *thread;
thread = machine__findnew_thread(machine, getpid(), td->tid);
pr_debug("looking for map %p\n", td->map);
thread__find_addr_map(thread,
PERF_RECORD_MISC_USER, MAP__FUNCTION,
(unsigned long) (td->map + 1), &al);
thread__put(thread);
if (!al.map) {
pr_debug("failed, couldn't find map\n");
err = -1;
break;
}
pr_debug("map %p, addr %" PRIx64 "\n", al.map, al.map->start);
}
machine__delete_threads(machine);
machines__exit(&machines);
return err;
}
void thread__find_addr_location(struct thread *self,
struct perf_session *session, u8 cpumode,
enum map_type type, u64 addr,
struct addr_location *al,
symbol_filter_t filter)
{
thread__find_addr_map(self, session, cpumode, type, addr, al);
if (al->map != NULL)
al->sym = map__find_symbol(al->map, al->addr, filter);
else
al->sym = NULL;
}
static int build_id__mark_dso_hit(event_t *event, struct perf_session *session)
{
struct addr_location al;
u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
struct thread *thread = perf_session__findnew(session, event->ip.pid);
if (thread == NULL) {
pr_err("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
event->ip.ip, &al);
if (al.map != NULL)
al.map->dso->hit = 1;
return 0;
}
static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
Dwarf_Word *data)
{
struct addr_location al;
ssize_t size;
thread__find_addr_map(ui->thread, ui->machine, PERF_RECORD_MISC_USER,
MAP__FUNCTION, addr, &al);
if (!al.map) {
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
return -1;
}
if (!al.map->dso)
return -1;
size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
addr, (u8 *) data, sizeof(*data));
return !(size == sizeof(*data));
}
static int read_object_code(u64 addr, size_t len, u8 cpumode,
struct thread *thread, struct machine *machine,
struct state *state)
{
struct addr_location al;
unsigned char buf1[BUFSZ];
unsigned char buf2[BUFSZ];
size_t ret_len;
u64 objdump_addr;
int ret;
pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION, addr,
&al);
if (!al.map || !al.map->dso) {
pr_debug("thread__find_addr_map failed\n");
return -1;
}
pr_debug("File is: %s\n", al.map->dso->long_name);
if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
!dso__is_kcore(al.map->dso)) {
pr_debug("Unexpected kernel address - skipping\n");
return 0;
}
pr_debug("On file address is: %#"PRIx64"\n", al.addr);
if (len > BUFSZ)
len = BUFSZ;
/* Do not go off the map */
if (addr + len > al.map->end)
len = al.map->end - addr;
/* Read the object code using perf */
ret_len = dso__data_read_offset(al.map->dso, machine, al.addr, buf1,
len);
if (ret_len != len) {
pr_debug("dso__data_read_offset failed\n");
return -1;
}
/*
* Converting addresses for use by objdump requires more information.
* map__load() does that. See map__rip_2objdump() for details.
*/
if (map__load(al.map, NULL))
return -1;
/* objdump struggles with kcore - try each map only once */
if (dso__is_kcore(al.map->dso)) {
size_t d;
for (d = 0; d < state->done_cnt; d++) {
if (state->done[d] == al.map->start) {
pr_debug("kcore map tested already");
pr_debug(" - skipping\n");
return 0;
}
}
if (state->done_cnt >= ARRAY_SIZE(state->done)) {
pr_debug("Too many kcore maps - skipping\n");
return 0;
}
state->done[state->done_cnt++] = al.map->start;
}
/* Read the object code using objdump */
objdump_addr = map__rip_2objdump(al.map, al.addr);
ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
if (ret > 0) {
/*
* The kernel maps are inaccurate - assume objdump is right in
* that case.
*/
if (cpumode == PERF_RECORD_MISC_KERNEL ||
cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
len -= ret;
if (len) {
pr_debug("Reducing len to %zu\n", len);
} else if (dso__is_kcore(al.map->dso)) {
/*
* objdump cannot handle very large segments
* that may be found in kcore.
*/
pr_debug("objdump failed for kcore");
pr_debug(" - skipping\n");
return 0;
} else {
return -1;
}
}
}
if (ret < 0) {
pr_debug("read_via_objdump failed\n");
return -1;
}
/* The results should be identical */
if (memcmp(buf1, buf2, len)) {
pr_debug("Bytes read differ from those read by objdump\n");
return -1;
}
pr_debug("Bytes read match those read by objdump\n");
return 0;
}
int event__preprocess_sample(const event_t *self, struct perf_session *session,
struct addr_location *al, symbol_filter_t filter)
{
u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
struct thread *thread = perf_session__findnew(session, self->ip.pid);
if (thread == NULL)
return -1;
if (symbol_conf.comm_list &&
!strlist__has_entry(symbol_conf.comm_list, thread->comm))
goto out_filtered;
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
/*
* Have we already created the kernel maps for the host machine?
*
* This should have happened earlier, when we processed the kernel MMAP
* events, but for older perf.data files there was no such thing, so do
* it now.
*/
if (cpumode == PERF_RECORD_MISC_KERNEL &&
session->host_machine.vmlinux_maps[MAP__FUNCTION] == NULL)
machine__create_kernel_maps(&session->host_machine);
thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
self->ip.pid, self->ip.ip, al);
dump_printf(" ...... dso: %s\n",
al->map ? al->map->dso->long_name :
al->level == 'H' ? "[hypervisor]" : "<not found>");
al->sym = NULL;
if (al->map) {
if (symbol_conf.dso_list &&
(!al->map || !al->map->dso ||
!(strlist__has_entry(symbol_conf.dso_list,
al->map->dso->short_name) ||
(al->map->dso->short_name != al->map->dso->long_name &&
strlist__has_entry(symbol_conf.dso_list,
al->map->dso->long_name)))))
goto out_filtered;
/*
* We have to do this here as we may have a dso with no symbol
* hit that has a name longer than the ones with symbols
* sampled.
*/
if (!sort_dso.elide && !al->map->dso->slen_calculated)
dso__calc_col_width(al->map->dso);
al->sym = map__find_symbol(al->map, al->addr, filter);
} else {
const unsigned int unresolved_col_width = BITS_PER_LONG / 4;
if (dsos__col_width < unresolved_col_width &&
!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
!symbol_conf.dso_list)
dsos__col_width = unresolved_col_width;
}
if (symbol_conf.sym_list && al->sym &&
!strlist__has_entry(symbol_conf.sym_list, al->sym->name))
goto out_filtered;
return 0;
out_filtered:
al->filtered = true;
return 0;
}
