(ColdReset): Set CP0 Config0 to reflect the address size supported

	by this simulator.
	(decode_coproc): Recognise additional CP0 Config registers
	correctly.

diff --git a/sim/mips/ChangeLog b/sim/mips/ChangeLog
index b6e956e..632ae32 100644 (file)
--- a/sim/mips/ChangeLog
+++ b/sim/mips/ChangeLog
@@ -1,3 +1,11 @@
+2007-02-19  Thiemo Seufer <ths@mips.com>
+            Nigel Stephens  <nigel@mips.com>
+       
+       (ColdReset): Set CP0 Config0 to reflect the address size supported
+       by this simulator.
+       (decode_coproc): Recognise additional CP0 Config registers
+       correctly.
+
 2007-02-19  Thiemo Seufer  <ths@mips.com>
             Nigel Stephens  <nigel@mips.com>
             David Ung  <davidu@mips.com>

diff --git a/sim/mips/interp.c b/sim/mips/interp.c
index 9bef890..13cd26e 100644 (file)
--- a/sim/mips/interp.c
+++ b/sim/mips/interp.c
@@ -1758,6 +1758,20 @@ ColdReset (SIM_DESC sd)
            FPR_STATE[rn] = fmt_uninterpreted;
        }
       
+      /* Initialise the Config0 register. */
+      C0_CONFIG = 0x80000000           /* Config1 present */
+       | 2;                            /* KSEG0 uncached */
+      if (WITH_TARGET_WORD_BITSIZE == 64)
+       {
+         /* FIXME Currently mips/sim-main.c:address_translation()
+            truncates all addresses to 32-bits. */
+         if (0 && WITH_TARGET_ADDRESS_BITSIZE == 64)
+           C0_CONFIG |= (2 << 13);     /* MIPS64, 64-bit addresses */
+         else
+           C0_CONFIG |= (1 << 13);     /* MIPS64, 32-bit addresses */
+       }
+      if (BigEndianMem)
+       C0_CONFIG |= 0x00008000;        /* Big Endian */
     }
 }
 
@@ -2252,10 +2266,11 @@ decode_coproc (SIM_DESC sd,
 #else
                /* 16 = Config             R4000   VR4100  VR4300 */
               case 16:
-                if (code == 0x00)
-                  GPR[rt] = C0_CONFIG;
-                else
-                  C0_CONFIG = GPR[rt];
+               if (code == 0x00)
+                 GPR[rt] = C0_CONFIG;
+               else
+                 /* only bottom three bits are writable */
+                 C0_CONFIG = (C0_CONFIG & ~0x7) | (GPR[rt] & 0x7);
                 break;
 #endif
 #ifdef SUBTARGET_R3900
@@ -2296,6 +2311,40 @@ decode_coproc (SIM_DESC sd,
 #endif
              }
          }
+       else if ((code == 0x00 || code == 0x01)
+                && rd == 16)
+         {
+           /* [D]MFC0 RT,C0_CONFIG,SEL */
+           signed32 cfg = 0;
+           switch (tail & 0x07) 
+             {
+             case 0:
+               cfg = C0_CONFIG;
+               break;
+             case 1:
+               /* MIPS32 r/o Config1: 
+                  Config2 present */
+               cfg = 0x80000000;
+               /* MIPS16 implemented. 
+                  XXX How to check configuration? */
+               cfg |= 0x0000004;
+               if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
+                 /* MDMX & FPU implemented */
+                 cfg |= 0x00000021;
+               break;
+             case 2:
+               /* MIPS32 r/o Config2: 
+                  Config3 present. */
+               cfg = 0x80000000;
+               break;
+             case 3:
+               /* MIPS32 r/o Config3: 
+                  SmartMIPS implemented. */
+               cfg = 0x00000002;
+               break;
+             }
+           GPR[rt] = cfg;
+         }
        else if (code == 0x10 && (tail & 0x3f) == 0x18)
          {
            /* ERET */