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 #define MAX_CPUS 8 /* lets not go nuts */ 20 21 typedef struct { 22 uint64_t insn_count; 23 } InstructionCount; 24 25 static InstructionCount counts[MAX_CPUS]; 26 static uint64_t inline_insn_count; 27 28 static bool do_inline; 29 static bool do_size; 30 static GArray *sizes; 31 32 typedef struct { 33 char *match_string; 34 uint64_t hits[MAX_CPUS]; 35 uint64_t last_hit[MAX_CPUS]; 36 uint64_t total_delta[MAX_CPUS]; 37 GPtrArray *history[MAX_CPUS]; 38 } Match; 39 40 static GArray *matches; 41 42 typedef struct { 43 Match *match; 44 uint64_t vaddr; 45 uint64_t hits; 46 char *disas; 47 } Instruction; 48 49 /* 50 * Initialise a new vcpu with reading the register list 51 */ 52 static void vcpu_init(qemu_plugin_id_t id, unsigned int vcpu_index) 53 { 54 g_autoptr(GArray) reg_list = qemu_plugin_get_registers(); 55 g_autoptr(GByteArray) reg_value = g_byte_array_new(); 56 57 if (reg_list) { 58 for (int i = 0; i < reg_list->len; i++) { 59 qemu_plugin_reg_descriptor *rd = &g_array_index( 60 reg_list, qemu_plugin_reg_descriptor, i); 61 int count = qemu_plugin_read_register(rd->handle, reg_value); 62 g_assert(count > 0); 63 } 64 } 65 } 66 67 68 static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata) 69 { 70 unsigned int i = cpu_index % MAX_CPUS; 71 InstructionCount *c = &counts[i]; 72 73 c->insn_count++; 74 } 75 76 static void vcpu_insn_matched_exec_before(unsigned int cpu_index, void *udata) 77 { 78 unsigned int i = cpu_index % MAX_CPUS; 79 Instruction *insn = (Instruction *) udata; 80 Match *match = insn->match; 81 g_autoptr(GString) ts = g_string_new(""); 82 83 insn->hits++; 84 g_string_append_printf(ts, "0x%" PRIx64 ", '%s', %"PRId64 " hits", 85 insn->vaddr, insn->disas, insn->hits); 86 87 uint64_t icount = counts[i].insn_count; 88 uint64_t delta = icount - match->last_hit[i]; 89 90 match->hits[i]++; 91 match->total_delta[i] += delta; 92 93 g_string_append_printf(ts, 94 ", %"PRId64" match hits, " 95 "Δ+%"PRId64 " since last match," 96 " %"PRId64 " avg insns/match\n", 97 match->hits[i], delta, 98 match->total_delta[i] / match->hits[i]); 99 100 match->last_hit[i] = icount; 101 102 qemu_plugin_outs(ts->str); 103 104 g_ptr_array_add(match->history[i], insn); 105 } 106 107 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb) 108 { 109 size_t n = qemu_plugin_tb_n_insns(tb); 110 size_t i; 111 112 for (i = 0; i < n; i++) { 113 struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i); 114 115 if (do_inline) { 116 qemu_plugin_register_vcpu_insn_exec_inline( 117 insn, QEMU_PLUGIN_INLINE_ADD_U64, &inline_insn_count, 1); 118 } else { 119 uint64_t vaddr = qemu_plugin_insn_vaddr(insn); 120 qemu_plugin_register_vcpu_insn_exec_cb( 121 insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, 122 GUINT_TO_POINTER(vaddr)); 123 } 124 125 if (do_size) { 126 size_t sz = qemu_plugin_insn_size(insn); 127 if (sz > sizes->len) { 128 g_array_set_size(sizes, sz); 129 } 130 unsigned long *cnt = &g_array_index(sizes, unsigned long, sz); 131 (*cnt)++; 132 } 133 134 /* 135 * If we are tracking certain instructions we will need more 136 * information about the instruction which we also need to 137 * save if there is a hit. 138 */ 139 if (matches) { 140 char *insn_disas = qemu_plugin_insn_disas(insn); 141 int j; 142 for (j = 0; j < matches->len; j++) { 143 Match *m = &g_array_index(matches, Match, j); 144 if (g_str_has_prefix(insn_disas, m->match_string)) { 145 Instruction *rec = g_new0(Instruction, 1); 146 rec->disas = g_strdup(insn_disas); 147 rec->vaddr = qemu_plugin_insn_vaddr(insn); 148 rec->match = m; 149 qemu_plugin_register_vcpu_insn_exec_cb( 150 insn, vcpu_insn_matched_exec_before, 151 QEMU_PLUGIN_CB_NO_REGS, rec); 152 } 153 } 154 g_free(insn_disas); 155 } 156 } 157 } 158 159 static void plugin_exit(qemu_plugin_id_t id, void *p) 160 { 161 g_autoptr(GString) out = g_string_new(NULL); 162 int i; 163 164 if (do_size) { 165 for (i = 0; i <= sizes->len; i++) { 166 unsigned long *cnt = &g_array_index(sizes, unsigned long, i); 167 if (*cnt) { 168 g_string_append_printf(out, 169 "len %d bytes: %ld insns\n", i, *cnt); 170 } 171 } 172 } else if (do_inline) { 173 g_string_append_printf(out, "insns: %" PRIu64 "\n", inline_insn_count); 174 } else { 175 uint64_t total_insns = 0; 176 for (i = 0; i < MAX_CPUS; i++) { 177 InstructionCount *c = &counts[i]; 178 if (c->insn_count) { 179 g_string_append_printf(out, "cpu %d insns: %" PRIu64 "\n", 180 i, c->insn_count); 181 total_insns += c->insn_count; 182 } 183 } 184 g_string_append_printf(out, "total insns: %" PRIu64 "\n", 185 total_insns); 186 } 187 qemu_plugin_outs(out->str); 188 } 189 190 191 /* Add a match to the array of matches */ 192 static void parse_match(char *match) 193 { 194 Match new_match = { .match_string = match }; 195 int i; 196 for (i = 0; i < MAX_CPUS; i++) { 197 new_match.history[i] = g_ptr_array_new(); 198 } 199 if (!matches) { 200 matches = g_array_new(false, true, sizeof(Match)); 201 } 202 g_array_append_val(matches, new_match); 203 } 204 205 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, 206 const qemu_info_t *info, 207 int argc, char **argv) 208 { 209 for (int i = 0; i < argc; i++) { 210 char *opt = argv[i]; 211 g_auto(GStrv) tokens = g_strsplit(opt, "=", 2); 212 if (g_strcmp0(tokens[0], "inline") == 0) { 213 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) { 214 fprintf(stderr, "boolean argument parsing failed: %s\n", opt); 215 return -1; 216 } 217 } else if (g_strcmp0(tokens[0], "sizes") == 0) { 218 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) { 219 fprintf(stderr, "boolean argument parsing failed: %s\n", opt); 220 return -1; 221 } 222 } else if (g_strcmp0(tokens[0], "match") == 0) { 223 parse_match(tokens[1]); 224 } else { 225 fprintf(stderr, "option parsing failed: %s\n", opt); 226 return -1; 227 } 228 } 229 230 if (do_size) { 231 sizes = g_array_new(true, true, sizeof(unsigned long)); 232 } 233 234 /* Register init, translation block and exit callbacks */ 235 qemu_plugin_register_vcpu_init_cb(id, vcpu_init); 236 qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans); 237 qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); 238 return 0; 239 } 240