plugin: add core code

Signed-off-by: Emilio G. Cota <cota@braap.org>
[AJB: moved directory and merged various fixes]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

2 files changed, 261 insertions, 0 deletions

diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index 07f2ab0590..e1c383ba84 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -29,6 +29,7 @@
 #include "qemu/rcu_queue.h"
 #include "qemu/queue.h"
 #include "qemu/thread.h"
+#include "qemu/plugin.h"
 
 typedef int (*WriteCoreDumpFunction)(const void *buf, size_t size,
                                      void *opaque);
@@ -344,6 +345,7 @@ struct qemu_work_item;
  * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes
  *                        to @trace_dstate).
  * @trace_dstate: Dynamic tracing state of events for this vCPU (bitmask).
+ * @plugin_mask: Plugin event bitmap. Modified only via async work.
  * @ignore_memory_transaction_failures: Cached copy of the MachineState
  *    flag of the same name: allows the board to suppress calling of the
  *    CPU do_transaction_failed hook function.
@@ -428,6 +430,10 @@ struct CPUState {
     DECLARE_BITMAP(trace_dstate_delayed, CPU_TRACE_DSTATE_MAX_EVENTS);
     DECLARE_BITMAP(trace_dstate, CPU_TRACE_DSTATE_MAX_EVENTS);
 
+    DECLARE_BITMAP(plugin_mask, QEMU_PLUGIN_EV_MAX);
+
+    GArray *plugin_mem_cbs;
+
     /* TODO Move common fields from CPUArchState here. */
     int cpu_index;
     int cluster_index;
diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h
new file mode 100644
index 0000000000..11687e8cdc
--- /dev/null
+++ b/include/qemu/plugin.h
@@ -0,0 +1,255 @@
+/*
+ * Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
+ *
+ * License: GNU GPL, version 2 or later.
+ *   See the COPYING file in the top-level directory.
+ */
+#ifndef QEMU_PLUGIN_H
+#define QEMU_PLUGIN_H
+
+#include "qemu/config-file.h"
+#include "qemu/qemu-plugin.h"
+#include "qemu/error-report.h"
+#include "qemu/queue.h"
+#include "qemu/option.h"
+
+/*
+ * Option parsing/processing.
+ * Note that we can load an arbitrary number of plugins.
+ */
+struct qemu_plugin_desc;
+typedef QTAILQ_HEAD(, qemu_plugin_desc) QemuPluginList;
+
+#ifdef CONFIG_PLUGIN
+extern QemuOptsList qemu_plugin_opts;
+
+static inline void qemu_plugin_add_opts(void)
+{
+    qemu_add_opts(&qemu_plugin_opts);
+}
+
+void qemu_plugin_opt_parse(const char *optarg, QemuPluginList *head);
+int qemu_plugin_load_list(QemuPluginList *head);
+#else /* !CONFIG_PLUGIN */
+static inline void qemu_plugin_add_opts(void)
+{ }
+
+static inline void qemu_plugin_opt_parse(const char *optarg,
+                                         QemuPluginList *head)
+{
+    error_report("plugin interface not enabled in this build");
+    exit(1);
+}
+
+static inline int qemu_plugin_load_list(QemuPluginList *head)
+{
+    return 0;
+}
+#endif /* !CONFIG_PLUGIN */
+
+/*
+ * Events that plugins can subscribe to.
+ */
+enum qemu_plugin_event {
+    QEMU_PLUGIN_EV_VCPU_INIT,
+    QEMU_PLUGIN_EV_VCPU_EXIT,
+    QEMU_PLUGIN_EV_VCPU_TB_TRANS,
+    QEMU_PLUGIN_EV_VCPU_IDLE,
+    QEMU_PLUGIN_EV_VCPU_RESUME,
+    QEMU_PLUGIN_EV_VCPU_SYSCALL,
+    QEMU_PLUGIN_EV_VCPU_SYSCALL_RET,
+    QEMU_PLUGIN_EV_FLUSH,
+    QEMU_PLUGIN_EV_ATEXIT,
+    QEMU_PLUGIN_EV_MAX, /* total number of plugin events we support */
+};
+
+union qemu_plugin_cb_sig {
+    qemu_plugin_simple_cb_t          simple;
+    qemu_plugin_udata_cb_t           udata;
+    qemu_plugin_vcpu_simple_cb_t     vcpu_simple;
+    qemu_plugin_vcpu_udata_cb_t      vcpu_udata;
+    qemu_plugin_vcpu_tb_trans_cb_t   vcpu_tb_trans;
+    qemu_plugin_vcpu_mem_cb_t        vcpu_mem;
+    qemu_plugin_vcpu_syscall_cb_t    vcpu_syscall;
+    qemu_plugin_vcpu_syscall_ret_cb_t vcpu_syscall_ret;
+    void *generic;
+};
+
+enum plugin_dyn_cb_type {
+    PLUGIN_CB_INSN,
+    PLUGIN_CB_MEM,
+    PLUGIN_N_CB_TYPES,
+};
+
+enum plugin_dyn_cb_subtype {
+    PLUGIN_CB_REGULAR,
+    PLUGIN_CB_INLINE,
+    PLUGIN_N_CB_SUBTYPES,
+};
+
+/*
+ * A dynamic callback has an insertion point that is determined at run-time.
+ * Usually the insertion point is somewhere in the code cache; think for
+ * instance of a callback to be called upon the execution of a particular TB.
+ */
+struct qemu_plugin_dyn_cb {
+    union qemu_plugin_cb_sig f;
+    void *userp;
+    unsigned tcg_flags;
+    enum plugin_dyn_cb_subtype type;
+    /* @rw applies to mem callbacks only (both regular and inline) */
+    enum qemu_plugin_mem_rw rw;
+    /* fields specific to each dyn_cb type go here */
+    union {
+        struct {
+            enum qemu_plugin_op op;
+            uint64_t imm;
+        } inline_insn;
+    };
+};
+
+struct qemu_plugin_insn {
+    GByteArray *data;
+    uint64_t vaddr;
+    void *haddr;
+    GArray *cbs[PLUGIN_N_CB_TYPES][PLUGIN_N_CB_SUBTYPES];
+    bool calls_helpers;
+    bool mem_helper;
+};
+
+/*
+ * qemu_plugin_insn allocate and cleanup functions. We don't expect to
+ * cleanup many of these structures. They are reused for each fresh
+ * translation.
+ */
+
+static inline void qemu_plugin_insn_cleanup_fn(gpointer data)
+{
+    struct qemu_plugin_insn *insn = (struct qemu_plugin_insn *) data;
+    g_byte_array_free(insn->data, true);
+}
+
+static inline struct qemu_plugin_insn *qemu_plugin_insn_alloc(void)
+{
+    int i, j;
+    struct qemu_plugin_insn *insn = g_new0(struct qemu_plugin_insn, 1);
+    insn->data = g_byte_array_sized_new(4);
+
+    for (i = 0; i < PLUGIN_N_CB_TYPES; i++) {
+        for (j = 0; j < PLUGIN_N_CB_SUBTYPES; j++) {
+            insn->cbs[i][j] = g_array_new(false, false,
+                                          sizeof(struct qemu_plugin_dyn_cb));
+        }
+    }
+    return insn;
+}
+
+struct qemu_plugin_tb {
+    GPtrArray *insns;
+    size_t n;
+    uint64_t vaddr;
+    uint64_t vaddr2;
+    void *haddr1;
+    void *haddr2;
+    GArray *cbs[PLUGIN_N_CB_SUBTYPES];
+};
+
+/**
+ * qemu_plugin_tb_insn_get(): get next plugin record for translation.
+ *
+ */
+static inline
+struct qemu_plugin_insn *qemu_plugin_tb_insn_get(struct qemu_plugin_tb *tb)
+{
+    struct qemu_plugin_insn *insn;
+    int i, j;
+
+    if (unlikely(tb->n == tb->insns->len)) {
+        struct qemu_plugin_insn *new_insn = qemu_plugin_insn_alloc();
+        g_ptr_array_add(tb->insns, new_insn);
+    }
+    insn = g_ptr_array_index(tb->insns, tb->n++);
+    g_byte_array_set_size(insn->data, 0);
+    insn->calls_helpers = false;
+    insn->mem_helper = false;
+
+    for (i = 0; i < PLUGIN_N_CB_TYPES; i++) {
+        for (j = 0; j < PLUGIN_N_CB_SUBTYPES; j++) {
+            g_array_set_size(insn->cbs[i][j], 0);
+        }
+    }
+
+    return insn;
+}
+
+#ifdef CONFIG_PLUGIN
+
+void qemu_plugin_vcpu_init_hook(CPUState *cpu);
+void qemu_plugin_vcpu_exit_hook(CPUState *cpu);
+void qemu_plugin_tb_trans_cb(CPUState *cpu, struct qemu_plugin_tb *tb);
+void qemu_plugin_vcpu_idle_cb(CPUState *cpu);
+void qemu_plugin_vcpu_resume_cb(CPUState *cpu);
+void
+qemu_plugin_vcpu_syscall(CPUState *cpu, int64_t num, uint64_t a1,
+                         uint64_t a2, uint64_t a3, uint64_t a4, uint64_t a5,
+                         uint64_t a6, uint64_t a7, uint64_t a8);
+void qemu_plugin_vcpu_syscall_ret(CPUState *cpu, int64_t num, int64_t ret);
+
+void qemu_plugin_vcpu_mem_cb(CPUState *cpu, uint64_t vaddr, uint32_t meminfo);
+
+void qemu_plugin_flush_cb(void);
+
+void qemu_plugin_atexit_cb(void);
+
+void qemu_plugin_add_dyn_cb_arr(GArray *arr);
+
+void qemu_plugin_disable_mem_helpers(CPUState *cpu);
+
+#else /* !CONFIG_PLUGIN */
+
+static inline void qemu_plugin_vcpu_init_hook(CPUState *cpu)
+{ }
+
+static inline void qemu_plugin_vcpu_exit_hook(CPUState *cpu)
+{ }
+
+static inline void qemu_plugin_tb_trans_cb(CPUState *cpu,
+                                           struct qemu_plugin_tb *tb)
+{ }
+
+static inline void qemu_plugin_vcpu_idle_cb(CPUState *cpu)
+{ }
+
+static inline void qemu_plugin_vcpu_resume_cb(CPUState *cpu)
+{ }
+
+static inline void
+qemu_plugin_vcpu_syscall(CPUState *cpu, int64_t num, uint64_t a1, uint64_t a2,
+                         uint64_t a3, uint64_t a4, uint64_t a5, uint64_t a6,
+                         uint64_t a7, uint64_t a8)
+{ }
+
+static inline
+void qemu_plugin_vcpu_syscall_ret(CPUState *cpu, int64_t num, int64_t ret)
+{ }
+
+static inline void qemu_plugin_vcpu_mem_cb(CPUState *cpu, uint64_t vaddr,
+                                           uint32_t meminfo)
+{ }
+
+static inline void qemu_plugin_flush_cb(void)
+{ }
+
+static inline void qemu_plugin_atexit_cb(void)
+{ }
+
+static inline
+void qemu_plugin_add_dyn_cb_arr(GArray *arr)
+{ }
+
+static inline void qemu_plugin_disable_mem_helpers(CPUState *cpu)
+{ }
+
+#endif /* !CONFIG_PLUGIN */
+
+#endif /* QEMU_PLUGIN_H */