@@ -43,6 +43,44 @@ typedef struct {
char *disas;
} Instruction;
+/* A hash table to hold matched instructions */
+static GHashTable *match_insn_records;
+static GMutex match_hash_lock;
+
+
+static Instruction * get_insn_record(const char *disas, uint64_t vaddr, Match *m)
+{
+ g_autofree char *str_hash = g_strdup_printf("%"PRIx64" %s", vaddr, disas);
+ Instruction *record;
+
+ g_mutex_lock(&match_hash_lock);
+
+ if (!match_insn_records) {
+ match_insn_records = g_hash_table_new(g_str_hash, g_str_equal);
+ }
+
+ record = g_hash_table_lookup(match_insn_records, str_hash);
+
+ if (!record) {
+ g_autoptr(GString) ts = g_string_new(str_hash);
+
+ record = g_new0(Instruction, 1);
+ record->disas = g_strdup(disas);
+ record->vaddr = vaddr;
+ record->match = m;
+
+ g_hash_table_insert(match_insn_records, str_hash, record);
+
+ g_string_prepend(ts, "Created record for: ");
+ g_string_append(ts, "\n");
+ qemu_plugin_outs(ts->str);
+ }
+
+ g_mutex_unlock(&match_hash_lock);
+
+ return record;
+}
+
/*
* Initialise a new vcpu with reading the register list
*/
@@ -131,16 +169,19 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
* If we are tracking certain instructions we will need more
* information about the instruction which we also need to
* save if there is a hit.
+ *
+ * We only want one record for each occurrence of the matched
+ * instruction.
*/
if (matches->len) {
char *insn_disas = qemu_plugin_insn_disas(insn);
for (int j = 0; j < matches->len; j++) {
Match *m = &g_array_index(matches, Match, j);
if (g_str_has_prefix(insn_disas, m->match_string)) {
- Instruction *rec = g_new0(Instruction, 1);
- rec->disas = g_strdup(insn_disas);
- rec->vaddr = qemu_plugin_insn_vaddr(insn);
- rec->match = m;
+ Instruction *rec = get_insn_record(insn_disas,
+ qemu_plugin_insn_vaddr(insn),
+ m);
+
qemu_plugin_register_vcpu_insn_exec_cb(
insn, vcpu_insn_matched_exec_before,
QEMU_PLUGIN_CB_NO_REGS, rec);
@@ -173,13 +214,38 @@ static void plugin_exit(qemu_plugin_id_t id, void *p)
qemu_plugin_u64_sum(insn_count));
}
qemu_plugin_outs(out->str);
-
qemu_plugin_scoreboard_free(insn_count.score);
+
+ g_mutex_lock(&match_hash_lock);
+
for (i = 0; i < matches->len; ++i) {
Match *m = &g_array_index(matches, Match, i);
+ GHashTableIter iter;
+ Instruction *record;
+ qemu_plugin_u64 hit_e = qemu_plugin_scoreboard_u64_in_struct(m->counts, MatchCount, hits);
+ uint64_t hits = qemu_plugin_u64_sum(hit_e);
+
+ g_string_printf(out, "Match: %s, hits %"PRId64"\n", m->match_string, hits);
+ qemu_plugin_outs(out->str);
+
+ g_hash_table_iter_init(&iter, match_insn_records);
+ while (g_hash_table_iter_next(&iter, NULL, (void **)&record)) {
+ if (record->match == m) {
+ g_string_printf(out,
+ " %"PRIx64": %s (hits %"PRId64")\n",
+ record->vaddr,
+ record->disas,
+ record->hits);
+ qemu_plugin_outs(out->str);
+ }
+ }
+
g_free(m->match_string);
qemu_plugin_scoreboard_free(m->counts);
}
+
+ g_mutex_unlock(&match_hash_lock);
+
g_array_free(matches, TRUE);
g_array_free(sizes, TRUE);
}
We are interested in the particular instruction so we should use a stable record for it. We could bring this down to physical address but for now vaddr + disas seems to do the trick. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> --- tests/plugin/insn.c | 76 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 71 insertions(+), 5 deletions(-)