From ef4d20e91566e7f6ee7133ccee235f6922bd6df5 Mon Sep 17 00:00:00 2001
From: Joyce Janczyn <janczyn@cygnus>
Date: Wed, 26 Aug 1998 13:31:38 +0000
Subject: Regress yesterday's change to jmp instruction -- it has deceiving
 syntax. Also tidy up some code to match documentation and fix div, divu by 0.

---
 sim/mn10300/ChangeLog    |  5 +++++
 sim/mn10300/mn10300.igen | 44 +++++++++++++++++++++++++++-----------------
 2 files changed, 32 insertions(+), 17 deletions(-)

(limited to 'sim/mn10300')

diff --git a/sim/mn10300/ChangeLog b/sim/mn10300/ChangeLog
index 251f478..1278b76 100644
--- a/sim/mn10300/ChangeLog
+++ b/sim/mn10300/ChangeLog
@@ -1,3 +1,8 @@
+Wed Aug 26 09:29:38 1998  Joyce Janczyn  <janczyn@cygnus.com>
+
+	* mn10300.igen (div,divu): Fix divide instructions so divide by 0
+	behaves like the hardware.
+
 Tue Aug 25 16:46:59 1998  Joyce Janczyn  <janczyn@cygnus.com>
 
 	* mn10300.igen (OP_F0F4): Need to load contents of register AN0
diff --git a/sim/mn10300/mn10300.igen b/sim/mn10300/mn10300.igen
index 821529b..aec7a43 100644
--- a/sim/mn10300/mn10300.igen
+++ b/sim/mn10300/mn10300.igen
@@ -1964,18 +1964,23 @@
 
   PC = cia;
   denom = (signed32)State.regs[REG_D0 + DM1];
-  /* still need to check for overflow */
+
+  temp = State.regs[REG_MDR];
+  temp <<= 32;
+  temp |= State.regs[REG_D0 + DN0];
   if ( !(v = (0 == denom)) )
     {
-      temp = State.regs[REG_MDR];
-      temp <<= 32;
-      temp |= State.regs[REG_D0 + DN0];
       State.regs[REG_MDR] = temp % (signed32)State.regs[REG_D0 + DM1];
       temp /= (signed32)State.regs[REG_D0 + DM1];
       State.regs[REG_D0 + DN0] = temp & 0xffffffff;
-      z = (State.regs[REG_D0 + DN0] == 0);
-      n = (State.regs[REG_D0 + DN0] & 0x80000000) != 0;
     }
+  else
+    {
+      State.regs[REG_MDR] = temp;
+      State.regs[REG_D0 + DN0] = 0xff;
+    }
+  z = (State.regs[REG_D0 + DN0] == 0);
+  n = (State.regs[REG_D0 + DN0] & 0x80000000) != 0;
   PSW &= ~(PSW_Z | PSW_N | PSW_C | PSW_V);
   PSW |= ((z ? PSW_Z : 0) | (n ? PSW_N : 0) | (v ? PSW_V : 0));
 }
@@ -1996,17 +2001,22 @@
 
   PC = cia;
   denom = (unsigned32)State.regs[REG_D0 + DM1];
+  temp = State.regs[REG_MDR];
+  temp <<= 32;
+  temp |= State.regs[REG_D0 + DN0];
   if ( !(v = (0 == denom)) ) 
     {
-      temp = State.regs[REG_MDR];
-      temp <<= 32;
-      temp |= State.regs[REG_D0 + DN0];
       State.regs[REG_MDR] = temp % State.regs[REG_D0 + DM1];
       temp /= State.regs[REG_D0 + DM1];
       State.regs[REG_D0 + DN0] = temp & 0xffffffff;
-      z = (State.regs[REG_D0 + DN0] == 0);
-      n = (State.regs[REG_D0 + DN0] & 0x80000000) != 0;
     }
+  else
+    {
+      State.regs[REG_MDR] = temp;
+      State.regs[REG_D0 + DN0] = 0xff;
+    }
+  z = (State.regs[REG_D0 + DN0] == 0);
+  n = (State.regs[REG_D0 + DN0] & 0x80000000) != 0;
   PSW &= ~(PSW_Z | PSW_N | PSW_C | PSW_V);
   PSW |= ((z ? PSW_Z : 0) | (n ? PSW_N : 0) | (v ? PSW_V : 0));
 }
@@ -3334,7 +3344,7 @@
 // end-sanitize-am33
 {
   /* OP_F0F4 (); */
-  PC = load_word (State.regs[REG_A0 + AN0]);
+  PC = State.regs[REG_A0 + AN0];
   nia = PC;
 }
 
@@ -3512,19 +3522,19 @@
 }
 
 
-// 1111 0101 0000  DmDn; udf20 Dm,Dm
-8.0xf5+4.0x0,2.DM1,2.DM0:D0:::putx
+// 1111 0101 0000  DmDn; udf20 Dm,Dn
+8.0xf5+4.0x0,2.DM1,2.DN0:D0:::putx
 "putx"
 *mn10300
 {
   /* OP_F500 (); */
   PC = cia;
-  State.regs[REG_MDRQ] = State.regs[REG_D0 + DM0];
+  State.regs[REG_MDRQ] = State.regs[REG_D0 + DN0];
 }
 
 
-// 1111 0110 1111 DmDn; udf15 Dn,Dn
-8.0xf6+4.0xf,2.DN1,2.DN0:D0:::getx
+// 1111 0110 1111 DmDn; udf15 Dm,Dn
+8.0xf6+4.0xf,2.DM1,2.DN0:D0:::getx
 "getx"
 *mn10300
 // start-sanitize-am33
-- 
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