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[Qemu-devel] [RFC PATCH v8 08/21] cpu: replay instructions sequence


From: Pavel Dovgalyuk
Subject: [Qemu-devel] [RFC PATCH v8 08/21] cpu: replay instructions sequence
Date: Thu, 22 Jan 2015 11:52:15 +0300
User-agent: StGit/0.16

This patch adds calls to replay functions into the icount setup block.
In record mode number of executed instructions is written to the log.
In replay mode number of istructions to execute is taken from the replay log.

Signed-off-by: Pavel Dovgalyuk <address@hidden>
---
 cpu-exec.c      |    1 +
 cpus.c          |   28 ++++++++++++++++++----------
 replay/replay.c |   24 ++++++++++++++++++++++++
 replay/replay.h |    4 ++++
 4 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/cpu-exec.c b/cpu-exec.c
index 49f01f5..99a0993 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -531,6 +531,7 @@ int cpu_exec(CPUArchState *env)
                             }
                             cpu->exception_index = EXCP_INTERRUPT;
                             next_tb = 0;
+                            qemu_notify_event();
                             cpu_loop_exit(cpu);
                         }
                         break;
diff --git a/cpus.c b/cpus.c
index c513275..8787277 100644
--- a/cpus.c
+++ b/cpus.c
@@ -41,6 +41,7 @@
 #include "qemu/seqlock.h"
 #include "qapi-event.h"
 #include "hw/nmi.h"
+#include "replay/replay.h"
 
 #ifndef _WIN32
 #include "qemu/compatfd.h"
@@ -1342,18 +1343,22 @@ static int tcg_cpu_exec(CPUArchState *env)
                                     + cpu->icount_extra);
         cpu->icount_decr.u16.low = 0;
         cpu->icount_extra = 0;
-        deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
+        if (replay_mode != REPLAY_MODE_PLAY) {
+            deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
 
-        /* Maintain prior (possibly buggy) behaviour where if no deadline
-         * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
-         * INT32_MAX nanoseconds ahead, we still use INT32_MAX
-         * nanoseconds.
-         */
-        if ((deadline < 0) || (deadline > INT32_MAX)) {
-            deadline = INT32_MAX;
-        }
+            /* Maintain prior (possibly buggy) behaviour where if no deadline
+             * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more 
than
+             * INT32_MAX nanoseconds ahead, we still use INT32_MAX
+             * nanoseconds.
+             */
+            if ((deadline < 0) || (deadline > INT32_MAX)) {
+                deadline = INT32_MAX;
+            }
 
-        count = qemu_icount_round(deadline);
+            count = qemu_icount_round(deadline);
+        } else {
+            count = replay_get_instructions();
+        }
         timers_state.qemu_icount += count;
         decr = (count > 0xffff) ? 0xffff : count;
         count -= decr;
@@ -1371,6 +1376,9 @@ static int tcg_cpu_exec(CPUArchState *env)
                         + cpu->icount_extra);
         cpu->icount_decr.u32 = 0;
         cpu->icount_extra = 0;
+        if (replay_mode == REPLAY_MODE_PLAY) {
+            replay_exec_instructions();
+        }
     }
     return ret;
 }
diff --git a/replay/replay.c b/replay/replay.c
index a43bbbc..d6f5c4b 100755
--- a/replay/replay.c
+++ b/replay/replay.c
@@ -58,3 +58,27 @@ uint64_t replay_get_current_step(void)
 {
     return cpu_get_icount_raw();
 }
+
+int replay_get_instructions(void)
+{
+    int res = 0;
+    replay_mutex_lock();
+    if (skip_async_events(EVENT_INSTRUCTION)) {
+        res = replay_state.instructions_count;
+    }
+    replay_mutex_unlock();
+    return res;
+}
+
+void replay_exec_instructions(void)
+{
+    if (replay_state.instructions_count > 0) {
+        int count = (int)(replay_get_current_step()
+                          - replay_state.current_step);
+        replay_state.instructions_count -= count;
+        replay_state.current_step += count;
+        if (replay_state.instructions_count == 0 && count != 0) {
+            replay_has_unread_data = 0;
+        }
+    }
+}
diff --git a/replay/replay.h b/replay/replay.h
index a03c748..e425dea 100755
--- a/replay/replay.h
+++ b/replay/replay.h
@@ -22,5 +22,9 @@ extern ReplayMode replay_mode;
 
 /*! Returns number of executed instructions. */
 uint64_t replay_get_current_step(void);
+/*! Returns number of instructions to execute in replay mode. */
+int replay_get_instructions(void);
+/*! Updates instructions counter in replay mode. */
+void replay_exec_instructions(void);
 
 #endif




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