1 /* 2 * Copyright (C) 2018, Emilio G. Cota <cota@braap.org> 3 * 4 * License: GNU GPL, version 2 or later. 5 * See the COPYING file in the top-level directory. 6 */ 7 #include <inttypes.h> 8 #include <assert.h> 9 #include <stdlib.h> 10 #include <string.h> 11 #include <unistd.h> 12 #include <stdio.h> 13 #include <glib.h> 14 15 #include <qemu-plugin.h> 16 17 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; 18 19 static uint64_t insn_count; 20 static bool do_inline; 21 static bool do_size; 22 static GArray *sizes; 23 24 static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata) 25 { 26 static uint64_t last_pc; 27 uint64_t this_pc = GPOINTER_TO_UINT(udata); 28 if (this_pc == last_pc) { 29 g_autofree gchar *out = g_strdup_printf("detected repeat execution @ 0x%" 30 PRIx64 "\n", this_pc); 31 qemu_plugin_outs(out); 32 } 33 last_pc = this_pc; 34 insn_count++; 35 } 36 37 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb) 38 { 39 size_t n = qemu_plugin_tb_n_insns(tb); 40 size_t i; 41 42 for (i = 0; i < n; i++) { 43 struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i); 44 45 if (do_inline) { 46 qemu_plugin_register_vcpu_insn_exec_inline( 47 insn, QEMU_PLUGIN_INLINE_ADD_U64, &insn_count, 1); 48 } else { 49 uint64_t vaddr = qemu_plugin_insn_vaddr(insn); 50 qemu_plugin_register_vcpu_insn_exec_cb( 51 insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, 52 GUINT_TO_POINTER(vaddr)); 53 } 54 55 if (do_size) { 56 size_t sz = qemu_plugin_insn_size(insn); 57 if (sz > sizes->len) { 58 g_array_set_size(sizes, sz); 59 } 60 unsigned long *cnt = &g_array_index(sizes, unsigned long, sz); 61 (*cnt)++; 62 } 63 } 64 } 65 66 static void plugin_exit(qemu_plugin_id_t id, void *p) 67 { 68 g_autoptr(GString) out = g_string_new(NULL); 69 70 if (do_size) { 71 int i; 72 for (i = 0; i <= sizes->len; i++) { 73 unsigned long *cnt = &g_array_index(sizes, unsigned long, i); 74 if (*cnt) { 75 g_string_append_printf(out, 76 "len %d bytes: %ld insns\n", i, *cnt); 77 } 78 } 79 } else { 80 g_string_append_printf(out, "insns: %" PRIu64 "\n", insn_count); 81 } 82 qemu_plugin_outs(out->str); 83 } 84 85 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, 86 const qemu_info_t *info, 87 int argc, char **argv) 88 { 89 for (int i = 0; i < argc; i++) { 90 char *opt = argv[i]; 91 g_autofree char **tokens = g_strsplit(opt, "=", 2); 92 if (g_strcmp0(tokens[0], "inline") == 0) { 93 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) { 94 fprintf(stderr, "boolean argument parsing failed: %s\n", opt); 95 return -1; 96 } 97 } else if (g_strcmp0(tokens[0], "sizes") == 0) { 98 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) { 99 fprintf(stderr, "boolean argument parsing failed: %s\n", opt); 100 return -1; 101 } 102 } else { 103 fprintf(stderr, "option parsing failed: %s\n", opt); 104 return -1; 105 } 106 } 107 108 if (do_size) { 109 sizes = g_array_new(true, true, sizeof(unsigned long)); 110 } 111 112 qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans); 113 qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); 114 return 0; 115 } 116