1 /* 2 * Copyright (C) 2017, 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 #ifndef QEMU_PLUGIN_H 8 #define QEMU_PLUGIN_H 9 10 #include "qemu/config-file.h" 11 #include "qemu/qemu-plugin.h" 12 #include "qemu/error-report.h" 13 #include "qemu/queue.h" 14 #include "qemu/option.h" 15 16 /* 17 * Events that plugins can subscribe to. 18 */ 19 enum qemu_plugin_event { 20 QEMU_PLUGIN_EV_VCPU_INIT, 21 QEMU_PLUGIN_EV_VCPU_EXIT, 22 QEMU_PLUGIN_EV_VCPU_TB_TRANS, 23 QEMU_PLUGIN_EV_VCPU_IDLE, 24 QEMU_PLUGIN_EV_VCPU_RESUME, 25 QEMU_PLUGIN_EV_VCPU_SYSCALL, 26 QEMU_PLUGIN_EV_VCPU_SYSCALL_RET, 27 QEMU_PLUGIN_EV_FLUSH, 28 QEMU_PLUGIN_EV_ATEXIT, 29 QEMU_PLUGIN_EV_MAX, /* total number of plugin events we support */ 30 }; 31 32 /* 33 * Option parsing/processing. 34 * Note that we can load an arbitrary number of plugins. 35 */ 36 struct qemu_plugin_desc; 37 typedef QTAILQ_HEAD(, qemu_plugin_desc) QemuPluginList; 38 39 #ifdef CONFIG_PLUGIN 40 extern QemuOptsList qemu_plugin_opts; 41 42 static inline void qemu_plugin_add_opts(void) 43 { 44 qemu_add_opts(&qemu_plugin_opts); 45 } 46 47 void qemu_plugin_opt_parse(const char *optarg, QemuPluginList *head); 48 int qemu_plugin_load_list(QemuPluginList *head, Error **errp); 49 50 union qemu_plugin_cb_sig { 51 qemu_plugin_simple_cb_t simple; 52 qemu_plugin_udata_cb_t udata; 53 qemu_plugin_vcpu_simple_cb_t vcpu_simple; 54 qemu_plugin_vcpu_udata_cb_t vcpu_udata; 55 qemu_plugin_vcpu_tb_trans_cb_t vcpu_tb_trans; 56 qemu_plugin_vcpu_mem_cb_t vcpu_mem; 57 qemu_plugin_vcpu_syscall_cb_t vcpu_syscall; 58 qemu_plugin_vcpu_syscall_ret_cb_t vcpu_syscall_ret; 59 void *generic; 60 }; 61 62 enum plugin_dyn_cb_type { 63 PLUGIN_CB_INSN, 64 PLUGIN_CB_MEM, 65 PLUGIN_N_CB_TYPES, 66 }; 67 68 enum plugin_dyn_cb_subtype { 69 PLUGIN_CB_REGULAR, 70 PLUGIN_CB_INLINE, 71 PLUGIN_N_CB_SUBTYPES, 72 }; 73 74 /* 75 * A dynamic callback has an insertion point that is determined at run-time. 76 * Usually the insertion point is somewhere in the code cache; think for 77 * instance of a callback to be called upon the execution of a particular TB. 78 */ 79 struct qemu_plugin_dyn_cb { 80 union qemu_plugin_cb_sig f; 81 void *userp; 82 unsigned tcg_flags; 83 enum plugin_dyn_cb_subtype type; 84 /* @rw applies to mem callbacks only (both regular and inline) */ 85 enum qemu_plugin_mem_rw rw; 86 /* fields specific to each dyn_cb type go here */ 87 union { 88 struct { 89 enum qemu_plugin_op op; 90 uint64_t imm; 91 } inline_insn; 92 }; 93 }; 94 95 /* Internal context for instrumenting an instruction */ 96 struct qemu_plugin_insn { 97 GByteArray *data; 98 uint64_t vaddr; 99 void *haddr; 100 GArray *cbs[PLUGIN_N_CB_TYPES][PLUGIN_N_CB_SUBTYPES]; 101 bool calls_helpers; 102 bool mem_helper; 103 bool mem_only; 104 }; 105 106 /* 107 * qemu_plugin_insn allocate and cleanup functions. We don't expect to 108 * cleanup many of these structures. They are reused for each fresh 109 * translation. 110 */ 111 112 static inline void qemu_plugin_insn_cleanup_fn(gpointer data) 113 { 114 struct qemu_plugin_insn *insn = (struct qemu_plugin_insn *) data; 115 g_byte_array_free(insn->data, true); 116 } 117 118 static inline struct qemu_plugin_insn *qemu_plugin_insn_alloc(void) 119 { 120 int i, j; 121 struct qemu_plugin_insn *insn = g_new0(struct qemu_plugin_insn, 1); 122 insn->data = g_byte_array_sized_new(4); 123 124 for (i = 0; i < PLUGIN_N_CB_TYPES; i++) { 125 for (j = 0; j < PLUGIN_N_CB_SUBTYPES; j++) { 126 insn->cbs[i][j] = g_array_new(false, false, 127 sizeof(struct qemu_plugin_dyn_cb)); 128 } 129 } 130 return insn; 131 } 132 133 /* Internal context for this TranslationBlock */ 134 struct qemu_plugin_tb { 135 GPtrArray *insns; 136 size_t n; 137 uint64_t vaddr; 138 uint64_t vaddr2; 139 void *haddr1; 140 void *haddr2; 141 bool mem_only; 142 GArray *cbs[PLUGIN_N_CB_SUBTYPES]; 143 }; 144 145 /** 146 * qemu_plugin_tb_insn_get(): get next plugin record for translation. 147 * 148 */ 149 static inline 150 struct qemu_plugin_insn *qemu_plugin_tb_insn_get(struct qemu_plugin_tb *tb) 151 { 152 struct qemu_plugin_insn *insn; 153 int i, j; 154 155 if (unlikely(tb->n == tb->insns->len)) { 156 struct qemu_plugin_insn *new_insn = qemu_plugin_insn_alloc(); 157 g_ptr_array_add(tb->insns, new_insn); 158 } 159 insn = g_ptr_array_index(tb->insns, tb->n++); 160 g_byte_array_set_size(insn->data, 0); 161 insn->calls_helpers = false; 162 insn->mem_helper = false; 163 164 for (i = 0; i < PLUGIN_N_CB_TYPES; i++) { 165 for (j = 0; j < PLUGIN_N_CB_SUBTYPES; j++) { 166 g_array_set_size(insn->cbs[i][j], 0); 167 } 168 } 169 170 return insn; 171 } 172 173 void qemu_plugin_vcpu_init_hook(CPUState *cpu); 174 void qemu_plugin_vcpu_exit_hook(CPUState *cpu); 175 void qemu_plugin_tb_trans_cb(CPUState *cpu, struct qemu_plugin_tb *tb); 176 void qemu_plugin_vcpu_idle_cb(CPUState *cpu); 177 void qemu_plugin_vcpu_resume_cb(CPUState *cpu); 178 void 179 qemu_plugin_vcpu_syscall(CPUState *cpu, int64_t num, uint64_t a1, 180 uint64_t a2, uint64_t a3, uint64_t a4, uint64_t a5, 181 uint64_t a6, uint64_t a7, uint64_t a8); 182 void qemu_plugin_vcpu_syscall_ret(CPUState *cpu, int64_t num, int64_t ret); 183 184 void qemu_plugin_vcpu_mem_cb(CPUState *cpu, uint64_t vaddr, uint32_t meminfo); 185 186 void qemu_plugin_flush_cb(void); 187 188 void qemu_plugin_atexit_cb(void); 189 190 void qemu_plugin_add_dyn_cb_arr(GArray *arr); 191 192 void qemu_plugin_disable_mem_helpers(CPUState *cpu); 193 194 #else /* !CONFIG_PLUGIN */ 195 196 static inline void qemu_plugin_add_opts(void) 197 { } 198 199 static inline void qemu_plugin_opt_parse(const char *optarg, 200 QemuPluginList *head) 201 { 202 error_report("plugin interface not enabled in this build"); 203 exit(1); 204 } 205 206 static inline int qemu_plugin_load_list(QemuPluginList *head, Error **errp) 207 { 208 return 0; 209 } 210 211 static inline void qemu_plugin_vcpu_init_hook(CPUState *cpu) 212 { } 213 214 static inline void qemu_plugin_vcpu_exit_hook(CPUState *cpu) 215 { } 216 217 static inline void qemu_plugin_tb_trans_cb(CPUState *cpu, 218 struct qemu_plugin_tb *tb) 219 { } 220 221 static inline void qemu_plugin_vcpu_idle_cb(CPUState *cpu) 222 { } 223 224 static inline void qemu_plugin_vcpu_resume_cb(CPUState *cpu) 225 { } 226 227 static inline void 228 qemu_plugin_vcpu_syscall(CPUState *cpu, int64_t num, uint64_t a1, uint64_t a2, 229 uint64_t a3, uint64_t a4, uint64_t a5, uint64_t a6, 230 uint64_t a7, uint64_t a8) 231 { } 232 233 static inline 234 void qemu_plugin_vcpu_syscall_ret(CPUState *cpu, int64_t num, int64_t ret) 235 { } 236 237 static inline void qemu_plugin_vcpu_mem_cb(CPUState *cpu, uint64_t vaddr, 238 uint32_t meminfo) 239 { } 240 241 static inline void qemu_plugin_flush_cb(void) 242 { } 243 244 static inline void qemu_plugin_atexit_cb(void) 245 { } 246 247 static inline 248 void qemu_plugin_add_dyn_cb_arr(GArray *arr) 249 { } 250 251 static inline void qemu_plugin_disable_mem_helpers(CPUState *cpu) 252 { } 253 254 #endif /* !CONFIG_PLUGIN */ 255 256 #endif /* QEMU_PLUGIN_H */ 257