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/*
* Copyright (C) 2020, Matthias Weckbecker <matthias@weckbecker.name>
*
* 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;
typedef struct {
int64_t num;
int64_t calls;
int64_t errors;
} SyscallStats;
static GMutex lock;
static GHashTable *statistics;
static SyscallStats *get_or_create_entry(int64_t num)
{
SyscallStats *entry =
(SyscallStats *) g_hash_table_lookup(statistics, GINT_TO_POINTER(num));
if (!entry) {
entry = g_new0(SyscallStats, 1);
entry->num = num;
g_hash_table_insert(statistics, GINT_TO_POINTER(num), (gpointer) entry);
}
return entry;
}
static void vcpu_syscall(qemu_plugin_id_t id, unsigned int vcpu_index,
int64_t num, uint64_t a1, uint64_t a2,
uint64_t a3, uint64_t a4, uint64_t a5,
uint64_t a6, uint64_t a7, uint64_t a8)
{
if (statistics) {
SyscallStats *entry;
g_mutex_lock(&lock);
entry = get_or_create_entry(num);
entry->calls++;
g_mutex_unlock(&lock);
} else {
g_autofree gchar *out = g_strdup_printf("syscall #%" PRIi64 "\n", num);
qemu_plugin_outs(out);
}
}
static void vcpu_syscall_ret(qemu_plugin_id_t id, unsigned int vcpu_idx,
int64_t num, int64_t ret)
{
if (statistics) {
SyscallStats *entry;
g_mutex_lock(&lock);
/* Should always return an existent entry. */
entry = get_or_create_entry(num);
if (ret < 0) {
entry->errors++;
}
g_mutex_unlock(&lock);
} else {
g_autofree gchar *out;
out = g_strdup_printf("syscall #%" PRIi64 " returned -> %" PRIi64 "\n",
num, ret);
qemu_plugin_outs(out);
}
}
static void print_entry(gpointer val, gpointer user_data)
{
g_autofree gchar *out;
SyscallStats *entry = (SyscallStats *) val;
int64_t syscall_num = entry->num;
out = g_strdup_printf(
"%-13" PRIi64 "%-6" PRIi64 " %" PRIi64 "\n",
syscall_num, entry->calls, entry->errors);
qemu_plugin_outs(out);
}
static gint comp_func(gconstpointer ea, gconstpointer eb)
{
SyscallStats *ent_a = (SyscallStats *) ea;
SyscallStats *ent_b = (SyscallStats *) eb;
return ent_a->calls > ent_b->calls ? -1 : 1;
}
/* ************************************************************************* */
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
if (!statistics) {
return;
}
g_mutex_lock(&lock);
GList *entries = g_hash_table_get_values(statistics);
entries = g_list_sort(entries, comp_func);
qemu_plugin_outs("syscall no. calls errors\n");
g_list_foreach(entries, print_entry, NULL);
g_list_free(entries);
g_hash_table_destroy(statistics);
g_mutex_unlock(&lock);
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
{
if (argc == 0) {
statistics = g_hash_table_new_full(NULL, g_direct_equal, NULL, g_free);
} else {
for (int i = 0; i < argc; i++) {
if (g_strcmp0(argv[i], "print") != 0) {
fprintf(stderr, "unsupported argument: %s\n", argv[i]);
return -1;
}
}
}
qemu_plugin_register_vcpu_syscall_cb(id, vcpu_syscall);
qemu_plugin_register_vcpu_syscall_ret_cb(id, vcpu_syscall_ret);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}
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