diff mbox series

[v2,11/33] plugins: Use translator_st for qemu_plugin_insn_data

Message ID 20240424233131.988727-12-richard.henderson@linaro.org
State Superseded
Headers show
Series accel/tcg: Improve disassembly for target and plugin | expand

Commit Message

Richard Henderson April 24, 2024, 11:31 p.m. UTC 
Use the bytes that we record for the entire TB, rather than
a per-insn GByteArray.  Record the length of the insn in
plugin_gen_insn_end rather than infering from the length
of the array.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/qemu/plugin.h  | 14 +-------------
 accel/tcg/plugin-gen.c |  7 +++++--
 accel/tcg/translator.c | 26 --------------------------
 plugins/api.c          | 12 +++++++-----
 tcg/tcg.c              |  3 +--
 5 files changed, 14 insertions(+), 48 deletions(-)

Comments

Philippe Mathieu-Daudé April 29, 2024, 10:44 a.m. UTC | #1 
On 25/4/24 01:31, Richard Henderson wrote:
> Use the bytes that we record for the entire TB, rather than
> a per-insn GByteArray.  Record the length of the insn in
> plugin_gen_insn_end rather than infering from the length
> of the array.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   include/qemu/plugin.h  | 14 +-------------
>   accel/tcg/plugin-gen.c |  7 +++++--
>   accel/tcg/translator.c | 26 --------------------------
>   plugins/api.c          | 12 +++++++-----
>   tcg/tcg.c              |  3 +--
>   5 files changed, 14 insertions(+), 48 deletions(-)

Nice!

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff mbox series

Patch

diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h
index 07b1755990..c32bb97667 100644
--- a/include/qemu/plugin.h
+++ b/include/qemu/plugin.h
@@ -97,11 +97,11 @@  struct qemu_plugin_dyn_cb {
 
 /* Internal context for instrumenting an instruction */
 struct qemu_plugin_insn {
-    GByteArray *data;
     uint64_t vaddr;
     void *haddr;
     GArray *insn_cbs;
     GArray *mem_cbs;
+    uint8_t len;
     bool calls_helpers;
 
     /* if set, the instruction calls helpers that might access guest memory */
@@ -116,18 +116,6 @@  struct qemu_plugin_scoreboard {
     QLIST_ENTRY(qemu_plugin_scoreboard) entry;
 };
 
-/*
- * 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);
-}
-
 /* Internal context for this TranslationBlock */
 struct qemu_plugin_tb {
     GPtrArray *insns;
diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c
index 94bbad6dc7..be2451be58 100644
--- a/accel/tcg/plugin-gen.c
+++ b/accel/tcg/plugin-gen.c
@@ -346,11 +346,9 @@  void plugin_gen_insn_start(CPUState *cpu, const DisasContextBase *db)
     ptb->n = n;
     if (n <= ptb->insns->len) {
         insn = g_ptr_array_index(ptb->insns, n - 1);
-        g_byte_array_set_size(insn->data, 0);
     } else {
         assert(n - 1 == ptb->insns->len);
         insn = g_new0(struct qemu_plugin_insn, 1);
-        insn->data = g_byte_array_sized_new(4);
         g_ptr_array_add(ptb->insns, insn);
     }
 
@@ -389,6 +387,11 @@  void plugin_gen_insn_start(CPUState *cpu, const DisasContextBase *db)
 
 void plugin_gen_insn_end(void)
 {
+    const DisasContextBase *db = tcg_ctx->plugin_db;
+    struct qemu_plugin_insn *pinsn = tcg_ctx->plugin_insn;
+
+    pinsn->len = db->fake_insn ? db->record_len : db->pc_next - pinsn->vaddr;
+
     tcg_gen_plugin_cb(PLUGIN_GEN_AFTER_INSN);
 }
 
diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c
index 7f63a8085d..df73312f99 100644
--- a/accel/tcg/translator.c
+++ b/accel/tcg/translator.c
@@ -408,27 +408,6 @@  bool translator_st(const DisasContextBase *db, void *dest,
     return false;
 }
 
-static void plugin_insn_append(vaddr pc, const void *from, size_t size)
-{
-#ifdef CONFIG_PLUGIN
-    struct qemu_plugin_insn *insn = tcg_ctx->plugin_insn;
-    size_t off;
-
-    if (insn == NULL) {
-        return;
-    }
-    off = pc - insn->vaddr;
-    if (off < insn->data->len) {
-        g_byte_array_set_size(insn->data, off);
-    } else if (off > insn->data->len) {
-        /* we have an unexpected gap */
-        g_assert_not_reached();
-    }
-
-    insn->data = g_byte_array_append(insn->data, from, size);
-#endif
-}
-
 uint8_t translator_ldub(CPUArchState *env, DisasContextBase *db, vaddr pc)
 {
     uint8_t raw;
@@ -437,7 +416,6 @@  uint8_t translator_ldub(CPUArchState *env, DisasContextBase *db, vaddr pc)
         raw = cpu_ldub_code(env, pc);
         record_save(db, pc, &raw, sizeof(raw));
     }
-    plugin_insn_append(pc, &raw, sizeof(raw));
     return raw;
 }
 
@@ -452,7 +430,6 @@  uint16_t translator_lduw(CPUArchState *env, DisasContextBase *db, vaddr pc)
         raw = tswap16(tgt);
         record_save(db, pc, &raw, sizeof(raw));
     }
-    plugin_insn_append(pc, &raw, sizeof(raw));
     return tgt;
 }
 
@@ -467,7 +444,6 @@  uint32_t translator_ldl(CPUArchState *env, DisasContextBase *db, vaddr pc)
         raw = tswap32(tgt);
         record_save(db, pc, &raw, sizeof(raw));
     }
-    plugin_insn_append(pc, &raw, sizeof(raw));
     return tgt;
 }
 
@@ -482,7 +458,6 @@  uint64_t translator_ldq(CPUArchState *env, DisasContextBase *db, vaddr pc)
         raw = tswap64(tgt);
         record_save(db, pc, &raw, sizeof(raw));
     }
-    plugin_insn_append(pc, &raw, sizeof(raw));
     return tgt;
 }
 
@@ -491,5 +466,4 @@  void translator_fake_ldb(DisasContextBase *db, vaddr pc, uint8_t insn8)
     assert(pc >= db->pc_first);
     db->fake_insn = true;
     record_save(db, pc, &insn8, sizeof(insn8));
-    plugin_insn_append(pc, &insn8, sizeof(insn8));
 }
diff --git a/plugins/api.c b/plugins/api.c
index 4e9125ea29..7b8b7523b3 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -43,6 +43,7 @@ 
 #include "exec/exec-all.h"
 #include "exec/gdbstub.h"
 #include "exec/ram_addr.h"
+#include "exec/translator.h"
 #include "disas/disas.h"
 #include "plugin.h"
 #ifndef CONFIG_USER_ONLY
@@ -219,14 +220,15 @@  qemu_plugin_tb_get_insn(const struct qemu_plugin_tb *tb, size_t idx)
 size_t qemu_plugin_insn_data(const struct qemu_plugin_insn *insn,
                              void *dest, size_t len)
 {
-    len = MIN(len, insn->data->len);
-    memcpy(dest, insn->data->data, len);
-    return len;
+    const DisasContextBase *db = tcg_ctx->plugin_db;
+
+    len = MIN(len, insn->len);
+    return translator_st(db, dest, insn->vaddr, len) ? len : 0;
 }
 
 size_t qemu_plugin_insn_size(const struct qemu_plugin_insn *insn)
 {
-    return insn->data->len;
+    return insn->len;
 }
 
 uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn)
@@ -242,7 +244,7 @@  void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn)
 char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn)
 {
     CPUState *cpu = current_cpu;
-    return plugin_disas(cpu, insn->vaddr, insn->data->len);
+    return plugin_disas(cpu, insn->vaddr, insn->len);
 }
 
 const char *qemu_plugin_insn_symbol(const struct qemu_plugin_insn *insn)
diff --git a/tcg/tcg.c b/tcg/tcg.c
index d248c52e96..691b2342a2 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -765,8 +765,7 @@  static void alloc_tcg_plugin_context(TCGContext *s)
 {
 #ifdef CONFIG_PLUGIN
     s->plugin_tb = g_new0(struct qemu_plugin_tb, 1);
-    s->plugin_tb->insns =
-        g_ptr_array_new_with_free_func(qemu_plugin_insn_cleanup_fn);
+    s->plugin_tb->insns = g_ptr_array_new();
 #endif
 }