summaryrefslogtreecommitdiff
path: root/tools/perf/util/unwind-libunwind.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/unwind-libunwind.c')
-rw-r--r--tools/perf/util/unwind-libunwind.c80
1 files changed, 53 insertions, 27 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index c83832b555e5..ee7e372297e5 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -319,6 +319,15 @@ static struct map *find_map(unw_word_t ip, struct unwind_info *ui)
thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__FUNCTION, ip, &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, ip, &al);
+ }
return al.map;
}
@@ -416,20 +425,19 @@ get_proc_name(unw_addr_space_t __maybe_unused as,
static int access_dso_mem(struct unwind_info *ui, unw_word_t addr,
unw_word_t *data)
{
- struct addr_location al;
+ struct map *map;
ssize_t size;
- thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
- MAP__FUNCTION, addr, &al);
- if (!al.map) {
+ map = find_map(addr, ui);
+ if (!map) {
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
return -1;
}
- if (!al.map->dso)
+ if (!map->dso)
return -1;
- size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
+ size = dso__data_read_addr(map->dso, map, ui->machine,
addr, (u8 *) data, sizeof(*data));
return !(size == sizeof(*data));
@@ -614,23 +622,48 @@ void unwind__finish_access(struct thread *thread)
static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
void *arg, int max_stack)
{
+ u64 val;
+ unw_word_t ips[max_stack];
unw_addr_space_t addr_space;
unw_cursor_t c;
- int ret;
-
- addr_space = thread__priv(ui->thread);
- if (addr_space == NULL)
- return -1;
+ int ret, i = 0;
- ret = unw_init_remote(&c, addr_space, ui);
+ ret = perf_reg_value(&val, &ui->sample->user_regs, PERF_REG_IP);
if (ret)
- display_error(ret);
+ return ret;
- while (!ret && (unw_step(&c) > 0) && max_stack--) {
- unw_word_t ip;
+ ips[i++] = (unw_word_t) val;
- unw_get_reg(&c, UNW_REG_IP, &ip);
- ret = ip ? entry(ip, ui->thread, cb, arg) : 0;
+ /*
+ * If we need more than one entry, do the DWARF
+ * unwind itself.
+ */
+ if (max_stack - 1 > 0) {
+ addr_space = thread__priv(ui->thread);
+ if (addr_space == NULL)
+ return -1;
+
+ ret = unw_init_remote(&c, addr_space, ui);
+ if (ret)
+ display_error(ret);
+
+ while (!ret && (unw_step(&c) > 0) && i < max_stack) {
+ unw_get_reg(&c, UNW_REG_IP, &ips[i]);
+ ++i;
+ }
+
+ max_stack = i;
+ }
+
+ /*
+ * Display what we got based on the order setup.
+ */
+ for (i = 0; i < max_stack && !ret; i++) {
+ int j = i;
+
+ if (callchain_param.order == ORDER_CALLER)
+ j = max_stack - i - 1;
+ ret = ips[j] ? entry(ips[j], ui->thread, cb, arg) : 0;
}
return ret;
@@ -640,24 +673,17 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
struct thread *thread,
struct perf_sample *data, int max_stack)
{
- u64 ip;
struct unwind_info ui = {
.sample = data,
.thread = thread,
.machine = thread->mg->machine,
};
- int ret;
if (!data->user_regs.regs)
return -EINVAL;
- ret = perf_reg_value(&ip, &data->user_regs, PERF_REG_IP);
- if (ret)
- return ret;
-
- ret = entry(ip, thread, cb, arg);
- if (ret)
- return -ENOMEM;
+ if (max_stack <= 0)
+ return -EINVAL;
- return --max_stack > 0 ? get_entries(&ui, cb, arg, max_stack) : 0;
+ return get_entries(&ui, cb, arg, max_stack);
}