--- upstream/dynamips-0.2.5/mips64_jit.c	2007/10/06 16:01:44	1
+++ upstream/dynamips-0.2.6-RC2/mips64_jit.c	2007/10/06 16:05:34	3
@@ -660,13 +660,21 @@
    return(0);
 }
 
+/* Check if PC register matches the compiled block virtual address */
+static forced_inline int insn_block_match(cpu_mips_t *cpu,insn_block_t *block)
+{
+   m_uint64_t vpage;
+
+   vpage = cpu->pc & ~(m_uint64_t)MIPS_MIN_PAGE_IMASK;
+   return(block->start_pc == vpage);
+}
+
 /* Execute a compiled MIPS code */
 void *insn_block_execute(cpu_mips_t *cpu)
 {  
    pthread_t timer_irq_thread;
    insn_block_t *block;
    m_uint32_t phys_page;
-   int idle_count = 0;
    int timer_irq_check = 0;
 
    if (pthread_create(&timer_irq_thread,NULL,
@@ -679,16 +687,19 @@
    }
 
    cpu->cpu_thread_running = TRUE;
+
  start_cpu:   
+   cpu->idle_count = 0;
+
    for(;;) {
-      if (unlikely(!cpu->pc) || unlikely(cpu->state != MIPS_CPU_RUNNING))
+      if (unlikely(cpu->state != MIPS_CPU_RUNNING))
          break;
 
       /* Handle virtual idle loop */
       if (unlikely(cpu->pc == cpu->idle_pc)) {
-         if (++idle_count == cpu->idle_max) {
+         if (++cpu->idle_count == cpu->idle_max) {
             mips64_idle_loop(cpu);
-            idle_count = 0;
+            cpu->idle_count = 0;
          }
       }
 
@@ -714,7 +725,13 @@
       block = cpu->exec_phys_map[phys_page];
 
       /* No block found, compile the page */
-      if (unlikely(!block)) {
+      if (unlikely(!block) || unlikely(!insn_block_match(cpu,block))) 
+      {
+         if (block != NULL) {
+            insn_block_free(cpu,block,TRUE);
+            cpu->exec_phys_map[phys_page] = NULL;
+         }
+
          block = insn_page_compile(cpu,cpu->pc);
          if (unlikely(!block)) {
             fprintf(stderr,