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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
17QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
18
19#define MAX_CPUS 8
20
21typedef struct {
22 uint64_t insn_count;
23} InstructionCount;
24
25static InstructionCount counts[MAX_CPUS];
26static uint64_t inline_insn_count;
27
28static bool do_inline;
29static bool do_size;
30static GArray *sizes;
31
32typedef 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
40static GArray *matches;
41
42typedef struct {
43 Match *match;
44 uint64_t vaddr;
45 uint64_t hits;
46 char *disas;
47} Instruction;
48
49static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
50{
51 unsigned int i = cpu_index % MAX_CPUS;
52 InstructionCount *c = &counts[i];
53
54 c->insn_count++;
55}
56
57static void vcpu_insn_matched_exec_before(unsigned int cpu_index, void *udata)
58{
59 unsigned int i = cpu_index % MAX_CPUS;
60 Instruction *insn = (Instruction *) udata;
61 Match *match = insn->match;
62 g_autoptr(GString) ts = g_string_new("");
63
64 insn->hits++;
65 g_string_append_printf(ts, "0x%" PRIx64 ", '%s', %"PRId64 " hits",
66 insn->vaddr, insn->disas, insn->hits);
67
68 uint64_t icount = counts[i].insn_count;
69 uint64_t delta = icount - match->last_hit[i];
70
71 match->hits[i]++;
72 match->total_delta[i] += delta;
73
74 g_string_append_printf(ts,
75 ", %"PRId64" match hits, "
76 "Δ+%"PRId64 " since last match,"
77 " %"PRId64 " avg insns/match\n",
78 match->hits[i], delta,
79 match->total_delta[i] / match->hits[i]);
80
81 match->last_hit[i] = icount;
82
83 qemu_plugin_outs(ts->str);
84
85 g_ptr_array_add(match->history[i], insn);
86}
87
88static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
89{
90 size_t n = qemu_plugin_tb_n_insns(tb);
91 size_t i;
92
93 for (i = 0; i < n; i++) {
94 struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
95
96 if (do_inline) {
97 qemu_plugin_register_vcpu_insn_exec_inline(
98 insn, QEMU_PLUGIN_INLINE_ADD_U64, &inline_insn_count, 1);
99 } else {
100 uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
101 qemu_plugin_register_vcpu_insn_exec_cb(
102 insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
103 GUINT_TO_POINTER(vaddr));
104 }
105
106 if (do_size) {
107 size_t sz = qemu_plugin_insn_size(insn);
108 if (sz > sizes->len) {
109 g_array_set_size(sizes, sz);
110 }
111 unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
112 (*cnt)++;
113 }
114
115
116
117
118
119
120 if (matches) {
121 char *insn_disas = qemu_plugin_insn_disas(insn);
122 int j;
123 for (j = 0; j < matches->len; j++) {
124 Match *m = &g_array_index(matches, Match, j);
125 if (g_str_has_prefix(insn_disas, m->match_string)) {
126 Instruction *rec = g_new0(Instruction, 1);
127 rec->disas = g_strdup(insn_disas);
128 rec->vaddr = qemu_plugin_insn_vaddr(insn);
129 rec->match = m;
130 qemu_plugin_register_vcpu_insn_exec_cb(
131 insn, vcpu_insn_matched_exec_before,
132 QEMU_PLUGIN_CB_NO_REGS, rec);
133 }
134 }
135 g_free(insn_disas);
136 }
137 }
138}
139
140static void plugin_exit(qemu_plugin_id_t id, void *p)
141{
142 g_autoptr(GString) out = g_string_new(NULL);
143 int i;
144
145 if (do_size) {
146 for (i = 0; i <= sizes->len; i++) {
147 unsigned long *cnt = &g_array_index(sizes, unsigned long, i);
148 if (*cnt) {
149 g_string_append_printf(out,
150 "len %d bytes: %ld insns\n", i, *cnt);
151 }
152 }
153 } else if (do_inline) {
154 g_string_append_printf(out, "insns: %" PRIu64 "\n", inline_insn_count);
155 } else {
156 uint64_t total_insns = 0;
157 for (i = 0; i < MAX_CPUS; i++) {
158 InstructionCount *c = &counts[i];
159 if (c->insn_count) {
160 g_string_append_printf(out, "cpu %d insns: %" PRIu64 "\n",
161 i, c->insn_count);
162 total_insns += c->insn_count;
163 }
164 }
165 g_string_append_printf(out, "total insns: %" PRIu64 "\n",
166 total_insns);
167 }
168 qemu_plugin_outs(out->str);
169}
170
171
172
173static void parse_match(char *match)
174{
175 Match new_match = { .match_string = match };
176 int i;
177 for (i = 0; i < MAX_CPUS; i++) {
178 new_match.history[i] = g_ptr_array_new();
179 }
180 if (!matches) {
181 matches = g_array_new(false, true, sizeof(Match));
182 }
183 g_array_append_val(matches, new_match);
184}
185
186QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
187 const qemu_info_t *info,
188 int argc, char **argv)
189{
190 for (int i = 0; i < argc; i++) {
191 char *opt = argv[i];
192 g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
193 if (g_strcmp0(tokens[0], "inline") == 0) {
194 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
195 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
196 return -1;
197 }
198 } else if (g_strcmp0(tokens[0], "sizes") == 0) {
199 if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) {
200 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
201 return -1;
202 }
203 } else if (g_strcmp0(tokens[0], "match") == 0) {
204 parse_match(tokens[1]);
205 } else {
206 fprintf(stderr, "option parsing failed: %s\n", opt);
207 return -1;
208 }
209 }
210
211 if (do_size) {
212 sizes = g_array_new(true, true, sizeof(unsigned long));
213 }
214
215 qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
216 qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
217 return 0;
218}
219
