Merge tag 'pull-tcg-20240501' of https://gitlab.com/rth7680/qemu into staging

plugins: Rewrite plugin tcg expansion

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# gpg: Signature made Wed 01 May 2024 07:32:57 AM PDT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
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# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [ultimate]

* tag 'pull-tcg-20240501' of https://gitlab.com/rth7680/qemu:
  plugins: Update the documentation block for plugin-gen.c
  plugins: Inline plugin_gen_empty_callback
  plugins: Merge qemu_plugin_tb_insn_get to plugin-gen.c
  plugins: Split out common cb expanders
  plugins: Replace pr_ops with a proper debug dump flag
  plugins: Introduce PLUGIN_CB_MEM_REGULAR
  plugins: Simplify callback queues
  tcg: Remove INDEX_op_plugin_cb_{start,end}
  tcg: Remove TCG_CALL_PLUGIN
  plugins: Remove plugin helpers
  plugins: Use emit_before_op for PLUGIN_GEN_FROM_MEM
  plugins: Use emit_before_op for PLUGIN_GEN_FROM_INSN
  plugins: Add PLUGIN_GEN_AFTER_TB
  plugins: Use emit_before_op for PLUGIN_GEN_FROM_TB
  plugins: Use emit_before_op for PLUGIN_GEN_AFTER_INSN
  plugins: Create TCGHelperInfo for all out-of-line callbacks
  plugins: Move function pointer in qemu_plugin_dyn_cb
  plugins: Zero new qemu_plugin_dyn_cb entries
  tcg: Pass function pointer to tcg_gen_call*
  tcg: Make tcg/helper-info.h self-contained

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 49 insertions, 12 deletions

diff --git a/plugins/core.c b/plugins/core.c
index 11ca20e626..0213513ec6 100644
--- a/plugins/core.c
+++ b/plugins/core.c
@@ -307,7 +307,7 @@ static struct qemu_plugin_dyn_cb *plugin_get_dyn_cb(GArray **arr)
     GArray *cbs = *arr;
 
     if (!cbs) {
-        cbs = g_array_sized_new(false, false,
+        cbs = g_array_sized_new(false, true,
                                 sizeof(struct qemu_plugin_dyn_cb), 1);
         *arr = cbs;
     }
@@ -338,12 +338,25 @@ void plugin_register_dyn_cb__udata(GArray **arr,
                                    enum qemu_plugin_cb_flags flags,
                                    void *udata)
 {
-    struct qemu_plugin_dyn_cb *dyn_cb = plugin_get_dyn_cb(arr);
+    static TCGHelperInfo info[3] = {
+        [QEMU_PLUGIN_CB_NO_REGS].flags = TCG_CALL_NO_RWG,
+        [QEMU_PLUGIN_CB_R_REGS].flags = TCG_CALL_NO_WG,
+        /*
+         * Match qemu_plugin_vcpu_udata_cb_t:
+         *   void (*)(uint32_t, void *)
+         */
+        [0 ... 2].typemask = (dh_typemask(void, 0) |
+                              dh_typemask(i32, 1) |
+                              dh_typemask(ptr, 2))
+    };
 
+    struct qemu_plugin_dyn_cb *dyn_cb = plugin_get_dyn_cb(arr);
     dyn_cb->userp = udata;
-    /* Note flags are discarded as unused. */
-    dyn_cb->f.vcpu_udata = cb;
     dyn_cb->type = PLUGIN_CB_REGULAR;
+    dyn_cb->regular.f.vcpu_udata = cb;
+
+    assert((unsigned)flags < ARRAY_SIZE(info));
+    dyn_cb->regular.info = &info[flags];
 }
 
 void plugin_register_vcpu_mem_cb(GArray **arr,
@@ -352,14 +365,38 @@ void plugin_register_vcpu_mem_cb(GArray **arr,
                                  enum qemu_plugin_mem_rw rw,
                                  void *udata)
 {
-    struct qemu_plugin_dyn_cb *dyn_cb;
+    /*
+     * Expect that the underlying type for enum qemu_plugin_meminfo_t
+     * is either int32_t or uint32_t, aka int or unsigned int.
+     */
+    QEMU_BUILD_BUG_ON(
+        !__builtin_types_compatible_p(qemu_plugin_meminfo_t, uint32_t) &&
+        !__builtin_types_compatible_p(qemu_plugin_meminfo_t, int32_t));
+
+    static TCGHelperInfo info[3] = {
+        [QEMU_PLUGIN_CB_NO_REGS].flags = TCG_CALL_NO_RWG,
+        [QEMU_PLUGIN_CB_R_REGS].flags = TCG_CALL_NO_WG,
+        /*
+         * Match qemu_plugin_vcpu_mem_cb_t:
+         *   void (*)(uint32_t, qemu_plugin_meminfo_t, uint64_t, void *)
+         */
+        [0 ... 2].typemask =
+            (dh_typemask(void, 0) |
+             dh_typemask(i32, 1) |
+             (__builtin_types_compatible_p(qemu_plugin_meminfo_t, uint32_t)
+              ? dh_typemask(i32, 2) : dh_typemask(s32, 2)) |
+             dh_typemask(i64, 3) |
+             dh_typemask(ptr, 4))
+    };
 
-    dyn_cb = plugin_get_dyn_cb(arr);
+    struct qemu_plugin_dyn_cb *dyn_cb = plugin_get_dyn_cb(arr);
     dyn_cb->userp = udata;
-    /* Note flags are discarded as unused. */
-    dyn_cb->type = PLUGIN_CB_REGULAR;
+    dyn_cb->type = PLUGIN_CB_MEM_REGULAR;
     dyn_cb->rw = rw;
-    dyn_cb->f.generic = cb;
+    dyn_cb->regular.f.vcpu_mem = cb;
+
+    assert((unsigned)flags < ARRAY_SIZE(info));
+    dyn_cb->regular.info = &info[flags];
 }
 
 /*
@@ -510,9 +547,9 @@ void qemu_plugin_vcpu_mem_cb(CPUState *cpu, uint64_t vaddr,
                 break;
         }
         switch (cb->type) {
-        case PLUGIN_CB_REGULAR:
-            cb->f.vcpu_mem(cpu->cpu_index, make_plugin_meminfo(oi, rw),
-                           vaddr, cb->userp);
+        case PLUGIN_CB_MEM_REGULAR:
+            cb->regular.f.vcpu_mem(cpu->cpu_index, make_plugin_meminfo(oi, rw),
+                                   vaddr, cb->userp);
             break;
         case PLUGIN_CB_INLINE:
             exec_inline_op(cb, cpu->cpu_index);