diff options
Diffstat (limited to 'tests/tcg/plugins/syscall.c')
| -rw-r--r-- | tests/tcg/plugins/syscall.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/tests/tcg/plugins/syscall.c b/tests/tcg/plugins/syscall.c new file mode 100644 index 0000000000..72e1a5bf90 --- /dev/null +++ b/tests/tcg/plugins/syscall.c @@ -0,0 +1,144 @@ +/* + * 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 = g_strdup_printf( + "syscall #%" PRIi64 " returned -> %" PRIi64 "\n", num, ret); + qemu_plugin_outs(out); + } +} + +static void print_entry(gpointer val, gpointer user_data) +{ + SyscallStats *entry = (SyscallStats *) val; + int64_t syscall_num = entry->num; + g_autofree gchar *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) +{ + bool do_print = false; + + for (int i = 0; i < argc; i++) { + char *opt = argv[i]; + g_auto(GStrv) tokens = g_strsplit(opt, "=", 2); + + if (g_strcmp0(tokens[0], "print") == 0) { + if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_print)) { + fprintf(stderr, "boolean argument parsing failed: %s\n", opt); + } + } else { + fprintf(stderr, "unsupported argument: %s\n", argv[i]); + return -1; + } + } + + if (!do_print) { + statistics = g_hash_table_new_full(NULL, g_direct_equal, NULL, g_free); + } + + 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; +} |