static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
Dwarf_Word *data)
{
struct addr_location al;
ssize_t size;
if (!thread__find_map(ui->thread, PERF_RECORD_MISC_USER, addr, &al)) {
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));
}
void thread__find_addr_location(struct thread *self, u8 cpumode,
enum map_type type, u64 addr,
struct addr_location *al,
symbol_filter_t filter)
{
struct thread *thread = al->thread = self;
al->addr = addr;
if (cpumode & PERF_RECORD_MISC_KERNEL) {
al->level = 'k';
thread = kthread;
} else if (cpumode & PERF_RECORD_MISC_USER)
al->level = '.';
else {
al->level = 'H';
al->map = NULL;
al->sym = NULL;
return;
}
try_again:
al->map = thread__find_map(thread, type, al->addr);
if (al->map == NULL) {
/*
* If this is outside of all known maps, and is a negative
* address, try to look it up in the kernel dso, as it might be
* a vsyscall or vdso (which executes in user-mode).
*
* XXX This is nasty, we should have a symbol list in the
* "[vdso]" dso, but for now lets use the old trick of looking
* in the whole kernel symbol list.
*/
if ((long long)al->addr < 0 && thread != kthread) {
thread = kthread;
goto try_again;
}
al->sym = NULL;
} else {
al->addr = al->map->map_ip(al->map, al->addr);
al->sym = map__find_symbol(al->map, al->addr, filter);
}
}
