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 qemu_plugin_u64 insn_count; 20 21 static bool do_inline; 22 static bool do_size; 23 static GArray *sizes; 24 25 typedef struct { 26 uint64_t hits; 27 uint64_t last_hit; 28 uint64_t total_delta; 29 } MatchCount; 30 31 typedef struct { 32 char *match_string; 33 struct qemu_plugin_scoreboard *counts; /* MatchCount */ 34 } Match; 35 36 static GArray *matches; 37 38 typedef struct { 39 Match *match; 40 uint64_t vaddr; 41 uint64_t hits; 42 char *disas; 43 } Instruction; 44 45 /* 46 * Initialise a new vcpu with reading the register list 47 */ 48 static void vcpu_init(qemu_plugin_id_t id, unsigned int vcpu_index) 49 { 50 g_autoptr(GArray) reg_list = qemu_plugin_get_registers(); 51 g_autoptr(GByteArray) reg_value = g_byte_array_new(); 52 53 if (reg_list) { 54 for (int i = 0; i < reg_list->len; i++) { 55 qemu_plugin_reg_descriptor *rd = &g_array_index( 56 reg_list, qemu_plugin_reg_descriptor, i); 57 int count = qemu_plugin_read_register(rd->handle, reg_value); 58 g_assert(count > 0); 59 } 60 } 61 } 62 63 64 static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata) 65 { 66 qemu_plugin_u64_add(insn_count, cpu_index, 1); 67 } 68 69 static void vcpu_insn_matched_exec_before(unsigned int cpu_index, void *udata) 70 { 71 Instruction *insn = (Instruction *) udata; 72 Match *insn_match = insn->match; 73 MatchCount *match = qemu_plugin_scoreboard_find(insn_match->counts, 74 cpu_index); 75 76 g_autoptr(GString) ts = g_string_new(""); 77 78 insn->hits++; 79 g_string_append_printf(ts, "0x%" PRIx64 ", '%s', %"PRId64 " hits", 80 insn->vaddr, insn->disas, insn->hits); 81 82 uint64_t icount = qemu_plugin_u64_get(insn_count, cpu_index); 83 uint64_t delta = icount - match->last_hit; 84 85 match->hits++; 86 match->total_delta += delta; 87 88 g_string_append_printf(ts, 89 " , cpu %u," 90 " %"PRId64" match hits," 91 " Δ+%"PRId64 " since last match," 92 " %"PRId64 " avg insns/match\n", 93 cpu_index, 94 match->hits, delta, 95 match->total_delta / match->hits); 96 97 match->last_hit = icount; 98 99 qemu_plugin_outs(ts->str); 100 } 101 102 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb) 103 { 104 size_t n = qemu_plugin_tb_n_insns(tb); 105 size_t i; 106 107 for (i = 0; i < n; i++) { 108 struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i); 109 110 if (do_inline) { 111 qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu( 112 insn, QEMU_PLUGIN_INLINE_ADD_U64, insn_count, 1); 113 } else { 114 uint64_t vaddr = qemu_plugin_insn_vaddr(insn); 115 qemu_plugin_register_vcpu_insn_exec_cb( 116 insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, 117 GUINT_TO_POINTER(vaddr)); 118 } 119 120 if (do_size) { 121 size_t sz = qemu_plugin_insn_size(insn); 122 if (sz > sizes->len) { 123 g_array_set_size(sizes, sz); 124 } 125 unsigned long *cnt = &g_array_index(sizes, unsigned long, sz); 126 (*cnt)++; 127 } 128 129 /* 130 * If we are tracking certain instructions we will need more 131 * information about the instruction which we also need to 132 * save if there is a hit. 133 */ 134 if (matches->len) { 135 char *insn_disas = qemu_plugin_insn_disas(insn); 136 for (int j = 0; j < matches->len; j++) { 137 Match *m = &g_array_index(matches, Match, j); 138 if (g_str_has_prefix(insn_disas, m->match_string)) { 139 Instruction *rec = g_new0(Instruction, 1); 140 rec->disas = g_strdup(insn_disas); 141 rec->vaddr = qemu_plugin_insn_vaddr(insn); 142 rec->match = m; 143 qemu_plugin_register_vcpu_insn_exec_cb( 144 insn, vcpu_insn_matched_exec_before, 145 QEMU_PLUGIN_CB_NO_REGS, rec); 146 } 147 } 148 g_free(insn_disas); 149 } 150 } 151 } 152 153 static void plugin_exit(qemu_plugin_id_t id, void *p) 154 { 155 g_autoptr(GString) out = g_string_new(NULL); 156 int i; 157 158 if (do_size) { 159 for (i = 0; i <= sizes->len; i++) { 160 unsigned long *cnt = &g_array_index(sizes, unsigned long, i); 161 if (*cnt) { 162 g_string_append_printf(out, 163 "len %d bytes: %ld insns\n", i, *cnt); 164 } 165 } 166 } else { 167 for (i = 0; i < qemu_plugin_num_vcpus(); i++) { 168 g_string_append_printf(out, "cpu %d insns: %" PRIu64 "\n", 169 i, qemu_plugin_u64_get(insn_count, i)); 170 } 171 g_string_append_printf(out, "total insns: %" PRIu64 "\n", 172 qemu_plugin_u64_sum(insn_count)); 173 } 174 qemu_plugin_outs(out->str); 175 176 qemu_plugin_scoreboard_free(insn_count.score); 177 for (i = 0; i < matches->len; ++i) { 178 Match *m = &g_array_index(matches, Match, i); 179 g_free(m->match_string); 180 qemu_plugin_scoreboard_free(m->counts); 181 } 182 g_array_free(matches, TRUE); 183 g_array_free(sizes, TRUE); 184 } 185 186 187 /* Add a match to the array of matches */ 188 static void parse_match(char *match) 189 { 190 Match new_match = { 191 .match_string = g_strdup(match), 192 .counts = qemu_plugin_scoreboard_new(sizeof(MatchCount)) }; 193 g_array_append_val(matches, new_match); 194 } 195 196 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, 197 const qemu_info_t *info, 198 int argc, char **argv) 199 { 200 matches = g_array_new(false, true, sizeof(Match)); 201 /* null terminated so 0 is not a special case */ 202 sizes = g_array_new(true, true, sizeof(unsigned long)); 203 204 for (int i = 0; i < argc; i++) { 205 char *opt = argv[i]; 206 g_auto(GStrv) tokens = g_strsplit(opt, "=", 2); 207 if (g_strcmp0(tokens[0], "inline") == 0) { 208 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) { 209 fprintf(stderr, "boolean argument parsing failed: %s\n", opt); 210 return -1; 211 } 212 } else if (g_strcmp0(tokens[0], "sizes") == 0) { 213 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) { 214 fprintf(stderr, "boolean argument parsing failed: %s\n", opt); 215 return -1; 216 } 217 } else if (g_strcmp0(tokens[0], "match") == 0) { 218 parse_match(tokens[1]); 219 } else { 220 fprintf(stderr, "option parsing failed: %s\n", opt); 221 return -1; 222 } 223 } 224 225 insn_count = qemu_plugin_scoreboard_u64( 226 qemu_plugin_scoreboard_new(sizeof(uint64_t))); 227 228 /* Register init, translation block and exit callbacks */ 229 qemu_plugin_register_vcpu_init_cb(id, vcpu_init); 230 qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans); 231 qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); 232 return 0; 233 } 234