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/*
* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <qemu-plugin.h>
QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
static qemu_plugin_u64 insn_count;
static bool do_inline;
static bool do_size;
static bool do_trace;
static GArray *sizes;
typedef struct {
uint64_t hits;
uint64_t last_hit;
uint64_t total_delta;
} MatchCount;
typedef struct {
char *match_string;
struct qemu_plugin_scoreboard *counts; /* MatchCount */
} Match;
static GArray *matches;
typedef struct {
Match *match;
uint64_t vaddr;
uint64_t hits;
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
*/
static void vcpu_init(qemu_plugin_id_t id, unsigned int vcpu_index)
{
g_autoptr(GArray) reg_list = qemu_plugin_get_registers();
g_autoptr(GByteArray) reg_value = g_byte_array_new();
if (reg_list) {
for (int i = 0; i < reg_list->len; i++) {
qemu_plugin_reg_descriptor *rd = &g_array_index(
reg_list, qemu_plugin_reg_descriptor, i);
int count = qemu_plugin_read_register(rd->handle, reg_value);
g_assert(count > 0);
}
}
}
static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
{
qemu_plugin_u64_add(insn_count, cpu_index, 1);
}
static void vcpu_insn_matched_exec_before(unsigned int cpu_index, void *udata)
{
Instruction *insn = (Instruction *) udata;
Match *insn_match = insn->match;
MatchCount *match = qemu_plugin_scoreboard_find(insn_match->counts,
cpu_index);
insn->hits++;
uint64_t icount = qemu_plugin_u64_get(insn_count, cpu_index);
uint64_t delta = icount - match->last_hit;
match->hits++;
match->total_delta += delta;
match->last_hit = icount;
if (do_trace) {
g_autoptr(GString) ts = g_string_new("");
g_string_append_printf(ts, "0x%" PRIx64 ", '%s', %"PRId64 " hits",
insn->vaddr, insn->disas, insn->hits);
g_string_append_printf(ts,
" , cpu %u,"
" %"PRId64" match hits,"
" Δ+%"PRId64 " since last match,"
" %"PRId64 " avg insns/match\n",
cpu_index,
match->hits, delta,
match->total_delta / match->hits);
qemu_plugin_outs(ts->str);
}
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
size_t n = qemu_plugin_tb_n_insns(tb);
size_t i;
for (i = 0; i < n; i++) {
struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
if (do_inline) {
qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu(
insn, QEMU_PLUGIN_INLINE_ADD_U64, insn_count, 1);
} else {
uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
qemu_plugin_register_vcpu_insn_exec_cb(
insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
GUINT_TO_POINTER(vaddr));
}
if (do_size) {
size_t sz = qemu_plugin_insn_size(insn);
if (sz > sizes->len) {
g_array_set_size(sizes, sz);
}
unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
(*cnt)++;
}
/*
* 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 = 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);
}
}
g_free(insn_disas);
}
}
}
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autoptr(GString) out = g_string_new(NULL);
int i;
if (do_size) {
for (i = 0; i <= sizes->len; i++) {
unsigned long *cnt = &g_array_index(sizes, unsigned long, i);
if (*cnt) {
g_string_append_printf(out,
"len %d bytes: %ld insns\n", i, *cnt);
}
}
} else {
for (i = 0; i < qemu_plugin_num_vcpus(); i++) {
g_string_append_printf(out, "cpu %d insns: %" PRIu64 "\n",
i, qemu_plugin_u64_get(insn_count, i));
}
g_string_append_printf(out, "total insns: %" PRIu64 "\n",
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);
}
/* Add a match to the array of matches */
static void parse_match(char *match)
{
Match new_match = {
.match_string = g_strdup(match),
.counts = qemu_plugin_scoreboard_new(sizeof(MatchCount)) };
g_array_append_val(matches, new_match);
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
{
matches = g_array_new(false, true, sizeof(Match));
/* null terminated so 0 is not a special case */
sizes = g_array_new(true, true, sizeof(unsigned long));
for (int i = 0; i < argc; i++) {
char *opt = argv[i];
g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
if (g_strcmp0(tokens[0], "inline") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "sizes") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "match") == 0) {
parse_match(tokens[1]);
} else if (g_strcmp0(tokens[0], "trace") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_trace)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
insn_count = qemu_plugin_scoreboard_u64(
qemu_plugin_scoreboard_new(sizeof(uint64_t)));
/* Register init, translation block and exit callbacks */
qemu_plugin_register_vcpu_init_cb(id, vcpu_init);
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}
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