* XScale coprocessor support.

2001-04-18  matthew green  <mrg@redhat.com>

	* armcopro.c (write_cp15_reg): Set CHANGEMODE if endianness changes.
	(read_cp15_reg): Make non-static.
	(XScale_cp15_LDC): Update for write_cp15_reg() change.
	(XScale_cp15_MCR): Likewise.
	(XScale_cp15_write_reg): Likewise.
	(XScale_check_memacc): New function. Check for breakpoints being
	activated by memory accesses.  Does not support the Branch Target
	Buffer.
	(XScale_set_fsr_far): New function. Set FSR and FAR for XScale.
	(XScale_debug_moe): New function. Set the debug Method Of Entry,
	if configured.
	(write_cp14_reg): Reset count counter if requested.
	* armdefs.h (struct ARMul_State): New members `LastTime' and
	`CP14R0_CCD' used for the timer/counters.
	(ARMul_CP13_R0_FIQ, ARMul_CP13_R0_IRQ, ARMul_CP13_R8_PMUS,
	ARMul_CP14_R0_ENABLE, ARMul_CP14_R0_CLKRST, ARMul_CP14_R0_CCD,
	ARMul_CP14_R0_INTEN0, ARMul_CP14_R0_INTEN1, ARMul_CP14_R0_INTEN2,
	ARMul_CP14_R0_FLAG0, ARMul_CP14_R0_FLAG1, ARMul_CP14_R0_FLAG2,
	ARMul_CP14_R10_MOE_IB, ARMul_CP14_R10_MOE_DB, ARMul_CP14_R10_MOE_BT,
	ARMul_CP15_R1_ENDIAN, ARMul_CP15_R1_ALIGN, ARMul_CP15_R5_X,
	ARMul_CP15_R5_ST_ALIGN, ARMul_CP15_R5_IMPRE, ARMul_CP15_R5_MMU_EXCPT,
	ARMul_CP15_DBCON_M, ARMul_CP15_DBCON_E1, ARMul_CP15_DBCON_E0): New
	defines for XScale registers.
	(XScale_check_memacc, XScale_set_fsr_far, XScale_debug_moe): Prototype.
	(ARMul_Emulate32, ARMul_Emulate26): Clean up function definition.
	(ARMul_Emulate32): Handle the clock counter and hardware instruction
	breakpoints.  Call XScale_set_fsr_far() for software breakpoints and
	software interrupts.
	(LoadMult): Call XScale_set_fsr_far() for data aborts.
	(LoadSMult): Likewise.
	(StoreMult): Likewise.
	(StoreSMult): Likewise.
	* armemu.h (write_cp15_reg): Update prototype.
	* arminit.c (ARMul_NewState): Initialise CP14R0_CCD and LastTime.
	(ARMul_Abort): If XScale, check for FIQ and IRQ being enabled in CP13
	register 0.
	* armvirt.c (GetWord): Call XScale_check_memacc().
	(PutWord): Likewise.

6 files changed, 284 insertions, 22 deletions

diff --git a/sim/arm/ChangeLog b/sim/arm/ChangeLog
index 9f81f54..5c031ab 100644
--- a/sim/arm/ChangeLog
+++ b/sim/arm/ChangeLog
@@ -1,3 +1,44 @@
+2001-04-18  matthew green  <mrg@redhat.com>
+
+	* armcopro.c (write_cp15_reg): Set CHANGEMODE if endianness changes.
+	(read_cp15_reg): Make non-static.
+	(XScale_cp15_LDC): Update for write_cp15_reg() change.
+	(XScale_cp15_MCR): Likewise.
+	(XScale_cp15_write_reg): Likewise.
+	(XScale_check_memacc): New function. Check for breakpoints being
+	activated by memory accesses.  Does not support the Branch Target
+	Buffer.
+	(XScale_set_fsr_far): New function. Set FSR and FAR for XScale.
+	(XScale_debug_moe): New function. Set the debug Method Of Entry,
+	if configured.
+	(write_cp14_reg): Reset count counter if requested.
+	* armdefs.h (struct ARMul_State): New members `LastTime' and
+	`CP14R0_CCD' used for the timer/counters.
+	(ARMul_CP13_R0_FIQ, ARMul_CP13_R0_IRQ, ARMul_CP13_R8_PMUS,
+	ARMul_CP14_R0_ENABLE, ARMul_CP14_R0_CLKRST, ARMul_CP14_R0_CCD,
+	ARMul_CP14_R0_INTEN0, ARMul_CP14_R0_INTEN1, ARMul_CP14_R0_INTEN2,
+	ARMul_CP14_R0_FLAG0, ARMul_CP14_R0_FLAG1, ARMul_CP14_R0_FLAG2,
+	ARMul_CP14_R10_MOE_IB, ARMul_CP14_R10_MOE_DB, ARMul_CP14_R10_MOE_BT,
+	ARMul_CP15_R1_ENDIAN, ARMul_CP15_R1_ALIGN, ARMul_CP15_R5_X,
+	ARMul_CP15_R5_ST_ALIGN, ARMul_CP15_R5_IMPRE, ARMul_CP15_R5_MMU_EXCPT,
+	ARMul_CP15_DBCON_M, ARMul_CP15_DBCON_E1, ARMul_CP15_DBCON_E0): New
+	defines for XScale registers.
+	(XScale_check_memacc, XScale_set_fsr_far, XScale_debug_moe): Prototype.
+	(ARMul_Emulate32, ARMul_Emulate26): Clean up function definition.
+	(ARMul_Emulate32): Handle the clock counter and hardware instruction
+	breakpoints.  Call XScale_set_fsr_far() for software breakpoints and
+	software interrupts.
+	(LoadMult): Call XScale_set_fsr_far() for data aborts.
+	(LoadSMult): Likewise.
+	(StoreMult): Likewise.
+	(StoreSMult): Likewise.
+	* armemu.h (write_cp15_reg): Update prototype.
+	* arminit.c (ARMul_NewState): Initialise CP14R0_CCD and LastTime.
+	(ARMul_Abort): If XScale, check for FIQ and IRQ being enabled in CP13
+	register 0.
+	* armvirt.c (GetWord): Call XScale_check_memacc().
+	(PutWord): Likewise.
+
 2001-03-20  Nick Clifton  <nickc@redhat.com>
 
 	* armvirt.c (ARMul_ReLoadInstr): Do not enable alignment checking
diff --git a/sim/arm/armcopro.c b/sim/arm/armcopro.c
index 8605dcf..52b22d7 100644
--- a/sim/arm/armcopro.c
+++ b/sim/arm/armcopro.c
@@ -246,6 +246,15 @@ write_cp15_reg (ARMul_State * state, unsigned reg, unsigned opcode_2, unsigned C
 	     BITS (31, 14) and BIT (10) write as zero, BITS (6, 3) write as one.  */
 	  value &= 0x00003b87;
 	  value |= 0x00000078;
+
+          /* Change the endianness if necessary */
+          if ((value & ARMul_CP15_R1_ENDIAN) !=
+	      (XScale_cp15_opcode_2_is_0_Regs [reg] & ARMul_CP15_R1_ENDIAN))
+	    {
+	      state->bigendSig = value & ARMul_CP15_R1_ENDIAN;
+	      /* Force ARMulator to notice these now.  */
+	      state->Emulate = CHANGEMODE;
+	    }
 	  break;
 
 	case 2: /* Translation Table Base.  */
@@ -446,6 +455,103 @@ XScale_cp15_write_reg (ARMul_State * state ATTRIBUTE_UNUSED,
   return TRUE;
 }
 
+/***************************************************************************\
+*        Check for special XScale memory access features                    *
+\***************************************************************************/
+void
+XScale_check_memacc (ARMul_State * state, ARMword * address, int store)
+{
+  ARMword dbcon, r0, r1;
+  int e1, e0;
+
+  if (!state->is_XScale)
+    return;
+
+  /* Check for PID-ification.
+     XXX BTB access support will require this test failing.  */
+  r0 = (read_cp15_reg (13, 0, 0) & 0xfe000000);
+  if (r0 && (*address & 0xfe000000) == 0)
+    *address |= r0;
+
+  /* Check alignment fault enable/disable.  */
+  if ((read_cp15_reg (1, 0, 0) & ARMul_CP15_R1_ALIGN) && (*address & 3))
+    ARMul_Abort (state, ARMul_DataAbortV);
+
+  if (XScale_debug_moe (state, -1))
+    return;
+
+  /* Check the data breakpoint registers.  */
+  dbcon = read_cp15_reg (14, 0, 4);
+  r0 = read_cp15_reg (14, 0, 0);
+  r1 = read_cp15_reg (14, 0, 3);
+  e0 = dbcon & ARMul_CP15_DBCON_E0;
+
+  if (dbcon & ARMul_CP15_DBCON_M)
+    {
+      /* r1 is a inverse mask.  */
+      if (e0 != 0 && ((store && e0 != 3) || (!store && e0 != 1))
+          && ((*address & ~r1) == (r0 & ~r1)))
+	{
+          XScale_debug_moe (state, ARMul_CP14_R10_MOE_DB);
+          ARMul_OSHandleSWI (state, SWI_Breakpoint);
+	}
+    }
+  else
+    {
+      if (e0 != 0 && ((store && e0 != 3) || (!store && e0 != 1))
+              && ((*address & ~3) == (r0 & ~3)))
+	{
+          XScale_debug_moe (state, ARMul_CP14_R10_MOE_DB);
+          ARMul_OSHandleSWI (state, SWI_Breakpoint);
+	}
+
+      e1 = (dbcon & ARMul_CP15_DBCON_E1) >> 2;
+      if (e1 != 0 && ((store && e1 != 3) || (!store && e1 != 1))
+              && ((*address & ~3) == (r1 & ~3)))
+	{
+          XScale_debug_moe (state, ARMul_CP14_R10_MOE_DB);
+          ARMul_OSHandleSWI (state, SWI_Breakpoint);
+	}
+    }
+}
+
+/***************************************************************************\
+*        Check set 
+\***************************************************************************/
+void
+XScale_set_fsr_far(ARMul_State * state, ARMword fsr, ARMword far)
+{
+  if (!state->is_XScale || (read_cp14_reg (10) & (1UL << 31)) == 0)
+    return;
+
+  write_cp15_reg (state, 5, 0, 0, fsr);
+  write_cp15_reg (state, 6, 0, 0, far);
+}
+
+/* Set the XScale debug `method of entry' if it is enabled.  */
+int
+XScale_debug_moe (ARMul_State * state, int moe)
+{
+  ARMword value;
+
+  if (!state->is_XScale)
+    return 1;
+
+  value = read_cp14_reg (10);
+  if (value & (1UL << 31))
+    {
+      if (moe != -1)
+	{
+          value &= ~0x1c;
+          value |= moe;
+	
+          write_cp14_reg (10, value);
+	}
+      return 1;
+    }
+  return 0;
+}
+
 /* Coprocessor 13:  Interrupt Controller and Bus Controller.  */
 
 /* There are two sets of registers for copro 13.
@@ -735,6 +841,10 @@ write_cp14_reg (unsigned reg, ARMword value)
     case 0: /* PMNC */
       /* Only BITS (27:12), BITS (10:8) and BITS (6:0) can be written.  */
       value &= 0x0ffff77f;
+
+      /* Reset the clock counter if necessary */
+      if (value & ARMul_CP14_R0_CLKRST)
+        XScale_cp14_Regs [1] = 0;
       break;
 
     case 4:
diff --git a/sim/arm/armdefs.h b/sim/arm/armdefs.h
index 4ad5c5f..fde3125 100644
--- a/sim/arm/armdefs.h
+++ b/sim/arm/armdefs.h
@@ -102,6 +102,9 @@ struct ARMul_State
   ARMul_CPWrites *CPWrite[16];	/* Write CP register */
   unsigned char *CPData[16];	/* Coprocessor data */
   unsigned char const *CPRegWords[16];	/* map of coprocessor register sizes */
+  unsigned long LastTime;	/* Value of last call to ARMul_Time() */
+  ARMword CP14R0_CCD;		/* used to count 64 clock cycles with CP14 R0 bit
+				   3 set */
 
   unsigned EventSet;		/* the number of events in the queue */
   unsigned long Now;		/* time to the nearest cycle */
@@ -342,6 +345,32 @@ extern ARMword ARMul_MemAccess (ARMul_State * state, ARMword, ARMword,
 #define ARMul_CANT 1
 #define ARMul_INC 3
 
+#define ARMul_CP13_R0_FIQ	0x1
+#define ARMul_CP13_R0_IRQ	0x2
+#define ARMul_CP13_R8_PMUS	0x1
+
+#define ARMul_CP14_R0_ENABLE	0x0001
+#define ARMul_CP14_R0_CLKRST	0x0004
+#define ARMul_CP14_R0_CCD	0x0008
+#define ARMul_CP14_R0_INTEN0	0x0010
+#define ARMul_CP14_R0_INTEN1	0x0020
+#define ARMul_CP14_R0_INTEN2	0x0040
+#define ARMul_CP14_R0_FLAG0	0x0100
+#define ARMul_CP14_R0_FLAG1	0x0200
+#define ARMul_CP14_R0_FLAG2	0x0400
+#define ARMul_CP14_R10_MOE_IB	0x0004
+#define ARMul_CP14_R10_MOE_DB	0x0008
+#define ARMul_CP14_R10_MOE_BT	0x000c
+#define ARMul_CP15_R1_ENDIAN	0x0080
+#define ARMul_CP15_R1_ALIGN	0x0002
+#define ARMul_CP15_R5_X		0x0400
+#define ARMul_CP15_R5_ST_ALIGN	0x0001
+#define ARMul_CP15_R5_IMPRE	0x0406
+#define ARMul_CP15_R5_MMU_EXCPT	0x0400
+#define ARMul_CP15_DBCON_M	0x0100
+#define ARMul_CP15_DBCON_E1	0x000c
+#define ARMul_CP15_DBCON_E0	0x0003
+
 extern unsigned ARMul_CoProInit (ARMul_State * state);
 extern void ARMul_CoProExit (ARMul_State * state);
 extern void ARMul_CoProAttach (ARMul_State * state, unsigned number,
@@ -351,6 +380,10 @@ extern void ARMul_CoProAttach (ARMul_State * state, unsigned number,
 			       ARMul_CDPs * cdp,
 			       ARMul_CPReads * read, ARMul_CPWrites * write);
 extern void ARMul_CoProDetach (ARMul_State * state, unsigned number);
+extern void XScale_check_memacc (ARMul_State * state, ARMword * address,
+				 int store);
+extern void XScale_set_fsr_far (ARMul_State * state, ARMword fsr, ARMword far);
+extern int XScale_debug_moe (ARMul_State * state, int moe);
 
 /***************************************************************************\
 *               Definitons of things in the host environment                *
diff --git a/sim/arm/armemu.c b/sim/arm/armemu.c
index dcc505f..0947470 100644
--- a/sim/arm/armemu.c
+++ b/sim/arm/armemu.c
@@ -529,6 +529,79 @@ ARMul_Emulate26 (register ARMul_State * state)
 	  break;
 	}			/* cc check */
 
+      /* Handle the Clock counter here.  */
+      if (state->is_XScale)
+	{
+	  ARMword cp14r0 = state->CPRead[14] (state, 0, 0);
+
+	  if (cp14r0 && ARMul_CP14_R0_ENABLE)
+	    {
+	      unsigned long newcycles, nowtime = ARMul_Time(state);
+
+	      newcycles = nowtime - state->LastTime;
+	      state->LastTime = nowtime;
+	      if (cp14r0 && ARMul_CP14_R0_CCD)
+	        {
+		  if (state->CP14R0_CCD == -1)
+		    state->CP14R0_CCD = newcycles;
+		  else
+		    state->CP14R0_CCD += newcycles;
+		  if (state->CP14R0_CCD >= 64)
+		    {
+		      newcycles = 0;
+		      while (state->CP14R0_CCD >= 64)
+		        state->CP14R0_CCD -= 64, newcycles++;
+		      goto check_PMUintr;
+		    }
+		}
+	      else
+		{
+		  ARMword cp14r1;
+		  int do_int = 0;
+
+		  state->CP14R0_CCD = -1;
+check_PMUintr:
+		  cp14r0 |= ARMul_CP14_R0_FLAG2;
+		  (void) state->CPWrite[14] (state, 0, cp14r0);
+
+		  cp14r1 = state->CPRead[14] (state, 1, 0);
+
+		  /* coded like this for portability */
+		  while (newcycles)
+		    {
+		      if (cp14r1 == 0xffffffff)
+			{
+			  cp14r1 = 0;
+			  do_int = 1;
+			}
+		      else
+			cp14r1++;
+			newcycles--;
+		    }
+		  (void) state->CPWrite[14] (state, 1, cp14r1);
+		  if (do_int && (cp14r0 & ARMul_CP14_R0_INTEN2))
+		    {
+		      if (state->CPRead[13] (state, 8, 0)
+			&& ARMul_CP13_R8_PMUS)
+		        ARMul_Abort (state, ARMul_FIQV);
+		      else
+		        ARMul_Abort (state, ARMul_IRQV);
+		    }
+		}
+	    }
+	}
+
+      /* Handle hardware instructions breakpoints here.  */
+      if (state->is_XScale)
+	{
+	  if ((pc | 3) == (read_cp15_reg (14, 0, 8) | 2)
+           || (pc | 3) == (read_cp15_reg (14, 0, 9) | 2))
+	    {
+	      if (XScale_debug_moe (state, ARMul_CP14_R10_MOE_IB))
+	        ARMul_OSHandleSWI (state, SWI_Breakpoint);
+	    }
+	}
+
 /***************************************************************************\
 *               Actual execution of instructions begins here                *
 \***************************************************************************/
@@ -1355,26 +1428,11 @@ ARMul_Emulate26 (register ARMul_State * state)
 			ARMul_OSHandleSWI (state, SWI_Breakpoint);
 		      else
 			{
-			  /* BKPT - normally this will cause an abort, but for the
-			     XScale if bit 31 in register 10 of coprocessor 14 is
-			     clear, then this is treated as a no-op.  */
-			  if (state->is_XScale)
-			    {
-			      if (read_cp14_reg (10) & (1UL << 31))
-				{
-				  ARMword value;
-				  
-				  value = read_cp14_reg (10);
-				  value &= ~0x1c;
-				  value |= 0xc;
-				  
-				  write_cp14_reg (10, value);
-				  write_cp15_reg (state, 5, 0, 0, 0x200);  /* Set FSR.  */
-				  write_cp15_reg (state, 6, 0, 0, pc);     /* Set FAR.  */
-				}
-			      else
-				break;
-			    }
+			/* BKPT - normally this will cause an abort, but on the
+			   XScale we must check the DCSR.  */
+			  XScale_set_fsr_far (state, ARMul_CP15_R5_MMU_EXCPT, pc);
+	                  if (!XScale_debug_moe (state, ARMul_CP14_R10_MOE_BT))
+			    break;
 			}
 
 		      /* Force the next instruction to be refetched.  */
@@ -3425,6 +3483,7 @@ ARMul_Emulate26 (register ARMul_State * state)
 	      if (instr == ARMul_ABORTWORD && state->AbortAddr == pc)
 		{
 		  /* A prefetch abort.  */
+		  XScale_set_fsr_far (state, ARMul_CP15_R5_MMU_EXCPT, pc);
 		  ARMul_Abort (state, ARMul_PrefetchAbortV);
 		  break;
 		}
@@ -4295,6 +4354,7 @@ LoadMult (ARMul_State * state, ARMword instr, ARMword address, ARMword WBBase)
     state->Reg[temp++] = dest;
   else if (!state->Aborted)
     {
+      XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
       state->Aborted = ARMul_DataAbortV;
     }
 
@@ -4307,6 +4367,7 @@ LoadMult (ARMul_State * state, ARMword instr, ARMword address, ARMword WBBase)
 	  state->Reg[temp] = dest;
 	else if (!state->Aborted)
 	  {
+            XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
 	    state->Aborted = ARMul_DataAbortV;
 	  }
       }
@@ -4373,6 +4434,7 @@ LoadSMult (ARMul_State * state,
     state->Reg[temp++] = dest;
   else if (!state->Aborted)
     {
+      XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
       state->Aborted = ARMul_DataAbortV;
     }
 
@@ -4388,6 +4450,7 @@ LoadSMult (ARMul_State * state,
 	  state->Reg[temp] = dest;
 	else if (!state->Aborted)
 	  {
+            XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
 	    state->Aborted = ARMul_DataAbortV;
 	  }
       }
@@ -4489,6 +4552,7 @@ StoreMult (ARMul_State * state, ARMword instr,
 
   if (state->abortSig && !state->Aborted)
     {
+      XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
       state->Aborted = ARMul_DataAbortV;
     }
 
@@ -4504,6 +4568,7 @@ StoreMult (ARMul_State * state, ARMword instr,
 
 	if (state->abortSig && !state->Aborted)
 	  {
+            XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
 	    state->Aborted = ARMul_DataAbortV;
 	  }
       }
@@ -4585,6 +4650,7 @@ StoreSMult (ARMul_State * state,
 
   if (state->abortSig && !state->Aborted)
     {
+      XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
       state->Aborted = ARMul_DataAbortV;
     }
 
@@ -4599,6 +4665,7 @@ StoreSMult (ARMul_State * state,
 
 	if (state->abortSig && !state->Aborted)
 	  {
+            XScale_set_fsr_far(state, ARMul_CP15_R5_ST_ALIGN, address);
 	    state->Aborted = ARMul_DataAbortV;
 	  }
       }
diff --git a/sim/arm/arminit.c b/sim/arm/arminit.c
index 2f6e73d..bdbb2c7 100644
--- a/sim/arm/arminit.c
+++ b/sim/arm/arminit.c
@@ -106,6 +106,9 @@ ARMul_NewState (void)
   state->OSptr = NULL;
   state->CommandLine = NULL;
 
+  state->CP14R0_CCD = -1;
+  state->LastTime = 0;
+
   state->EventSet = 0;
   state->Now = 0;
   state->EventPtr = (struct EventNode **) malloc ((unsigned) EVENTLISTSIZE *
@@ -299,10 +302,14 @@ ARMul_Abort (ARMul_State * state, ARMword vector)
       SETABORT (IBIT, SVC26MODE, isize);
       break;
     case ARMul_IRQV:		/* IRQ */
-      SETABORT (IBIT, state->prog32Sig ? IRQ32MODE : IRQ26MODE, esize);
+      if (!state->is_XScale
+	  || (state->CPRead[13](state, 0, 0) & ARMul_CP13_R0_IRQ))
+        SETABORT (IBIT, state->prog32Sig ? IRQ32MODE : IRQ26MODE, esize);
       break;
     case ARMul_FIQV:		/* FIQ */
-      SETABORT (INTBITS, state->prog32Sig ? FIQ32MODE : FIQ26MODE, esize);
+      if (!state->is_XScale
+	  || (state->CPRead[13](state, 0, 0) & ARMul_CP13_R0_FIQ))
+        SETABORT (INTBITS, state->prog32Sig ? FIQ32MODE : FIQ26MODE, esize);
       break;
     }
   if (ARMul_MODE32BIT)
diff --git a/sim/arm/armvirt.c b/sim/arm/armvirt.c
index 15f2cb6..ce1e77d 100644
--- a/sim/arm/armvirt.c
+++ b/sim/arm/armvirt.c
@@ -64,6 +64,8 @@ GetWord (ARMul_State * state, ARMword address, int check)
   ARMword **pagetable;
   ARMword *pageptr;
 
+  XScale_check_memacc (state, &address, 0);
+
   page = address >> PAGEBITS;
   offset = (address & OFFSETBITS) >> 2;
   pagetable = (ARMword **) state->MemDataPtr;
@@ -97,6 +99,8 @@ PutWord (ARMul_State * state, ARMword address, ARMword data, int check)
   ARMword **pagetable;
   ARMword *pageptr;
 
+  XScale_check_memacc (state, &address, 1);
+
   page = address >> PAGEBITS;
   offset = (address & OFFSETBITS) >> 2;
   pagetable = (ARMword **) state->MemDataPtr;