[PATCH-H8300] TRAPA instruction handling

["Asgari J. Jinia" <AsgariJ@KPITCummins.com>]

Hi,

In h8300 simulator, stack handling of TRAPA instruction is not
as per hardware manual. Presently it takes 12 bytes to store
CCR,PC and EXR registers on stack but it should do it with 6
bytes. Also simulation of @aa:8 addressing is broken as SBR
register is initialized to zero after initialized with 0xFFFFFF00.

Following patch does proper stack and @aa:8 handling.

Regards,
Asgari Jinia

---------------------------------------------------------------------

ChangeLog
sim/h8300

2004-04-13  Asgari Jinia  <asgarij@kpitcummins.com>

	* compile.c (sim_resume): updated stack for TRAPA as per
	hardware manual.
	(init_pointers): Initialization of h8_get_reg_buf removed as it
	corrupts SBR_REGNUM register, initialized in sim_state_initialize 
	function.



--- sim/h8300/compile.old.c	2004-01-06 06:28:48.000000000 +0530
+++ sim/h8300/compile.c	2004-04-13 14:31:43.000000000 +0530
@@ -1808,7 +1808,6 @@ init_pointers (SIM_DESC sd)
 
       h8_set_mask (sd, memory_size - 1);
 
-      memset (h8_get_reg_buf (sd), 0, sizeof (((STATE_CPU (sd, 0))->regs)));
 
       for (i = 0; i < 8; i++)
 	{
@@ -3584,14 +3583,13 @@ sim_resume (SIM_DESC sd, int step, int s
 
 	  if (h8300smode)			/* pop exr */
 	    {
-	      h8_set_exr (sd, GET_MEMORY_L (tmp));
-	      tmp += 4;
+	      h8_set_exr (sd, GET_MEMORY_W (tmp));
+	      tmp += 2;
 	    }
 	  if (h8300hmode && !h8300_normal_mode)
 	    {
-	      h8_set_ccr (sd, GET_MEMORY_L (tmp));
-	      tmp += 4;
-	      pc = GET_MEMORY_L (tmp);
+	      h8_set_ccr (sd, (GET_MEMORY_L (tmp) >> 24));
+	      pc = GET_MEMORY_L (tmp) & 0x00FFFFFF;
 	      tmp += 4;
 	    }
 	  else
@@ -3671,17 +3669,16 @@ sim_resume (SIM_DESC sd, int step, int s
    	  else
    	    {
    	      tmp -= 4;
-   	      SET_MEMORY_L (tmp, code->next_pc);
-   	      tmp -= 4;
-   	      SET_MEMORY_L (tmp, h8_get_ccr (sd));
+   	      SET_MEMORY_L (tmp, (code->next_pc & 0x00FFFFFF)+
+   	                    ((tmp, h8_get_ccr (sd))<<24));
    	    }
    	  intMaskBit = 1;
    	  BUILDSR (sd);
  
 	  if (h8300smode)
 	    {
-	      tmp -= 4;
-	      SET_MEMORY_L (tmp, h8_get_exr (sd));
+	      tmp -= 2;
+	      SET_MEMORY_W (tmp, h8_get_exr (sd));
 	    }
 
 	  h8_set_reg (sd, SP_REGNUM, tmp);