X-Git-Url: http://git.joshuawise.com/firearm.git/blobdiff_plain/821617bbbb52327fbfc1a40f0dfb551c3ed8209a..b215c5ffbcbfcad8069f2a9163c5faf997658c98:/Decode.v

diff --git a/Decode.v b/Decode.v
index 763efba..2698eca 100644
--- a/Decode.v
+++ b/Decode.v
@@ -45,7 +45,7 @@ module Decode(
 		32'b????00010?101001111100000000????,	/* MSR (Transfer register to PSR) */
 		32'b????00?10?1010001111????????????,	/* MSR (Transfer register or immediate to PSR, flag bits only) */
 		32'b????00010?00????????00001001????,	/* Atomic swap */
-		32'b????000100101111111111110001????,	/* Branch */
+		32'b????000100101111111111110001????,	/* Branch and exchange */
 		32'b????000??0??????????00001??1????,	/* Halfword transfer - register offset */
 		32'b????000??1??????????00001??1????,	/* Halfword transfer - register offset */
 		32'b????011????????????????????1????,	/* Undefined. I hate ARM */
@@ -63,23 +63,119 @@ module Decode(
 			rpc = 32'hxxxxxxxx;
 		endcase
 
-	always @ (*) begin
+	always @(*)
 		casez (insn)
-		32'b????000000??????????????1001????: begin /* Multiply */
+		32'b????000000??????????????1001????:	/* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
 			read_0 = insn[15:12]; /* Rn */
+//		32'b????00001???????????????1001????,	/* Multiply long */
+//			read_0 = insn[11:8]; /* Rn */
+		32'b????00010?001111????000000000000,	/* MRS (Transfer PSR to register) */
+		32'b????00010?101001111100000000????,	/* MSR (Transfer register to PSR) */
+		32'b????00?10?1010001111????????????:	/* MSR (Transfer register or immediate to PSR, flag bits only) */
+			read_0 = 4'hx;
+		32'b????00??????????????????????????:	/* ALU */
+			read_0 = insn[19:16]; /* Rn */
+		32'b????00010?00????????00001001????:	/* Atomic swap */
+			read_0 = insn[19:16]; /* Rn */
+		32'b????000100101111111111110001????:	/* Branch and exchange */
+			read_0 = insn[3:0];   /* Rn */
+		32'b????000??0??????????00001??1????:	/* Halfword transfer - register offset */
+			read_0 = insn[19:16];
+		32'b????000??1??????????00001??1????:	/* Halfword transfer - register offset */
+			read_0 = insn[19:16];
+		32'b????011????????????????????1????:	/* Undefined. I hate ARM */
+			read_0 = 4'hx;
+		32'b????01??????????????????????????:	/* Single data transfer */
+			read_0 = insn[19:16]; /* Rn */
+		32'b????100?????????????????????????:	/* Block data transfer */
+			read_0 = insn[19:16];
+		32'b????101?????????????????????????:	/* Branch */
+			read_0 = 4'hx;
+		32'b????110?????????????????????????:	/* Coprocessor data transfer */
+			read_0 = insn[19:16];
+		32'b????1110???????????????????0????,	/* Coprocessor data op */
+		32'b????1110???????????????????1????,	/* Coprocessor register transfer */
+		32'b????1111????????????????????????:	/* SWI */
+			read_0 = 4'hx;
+		default:
+			read_0 = 4'hx;
+		endcase
+	
+	always @(*)
+		casez (insn)
+		32'b????000000??????????????1001????:	/* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
+			read_1 = insn[3:0];   /* Rm */
+//		32'b????00001???????????????1001????:	/* Multiply long */
+//			read_1 = insn[3:0];   /* Rm */
+		32'b????00010?001111????000000000000,	/* MRS (Transfer PSR to register) */
+		32'b????00010?101001111100000000????,	/* MSR (Transfer register to PSR) */
+		32'b????00?10?1010001111????????????:	/* MSR (Transfer register or immediate to PSR, flag bits only) */
+			read_1 = 4'hx;
+		32'b????00??????????????????????????:	/* ALU */
+			read_1 = insn[3:0];   /* Rm */
+		32'b????00010?00????????00001001????:	/* Atomic swap */
 			read_1 = insn[3:0];   /* Rm */
+		32'b????000100101111111111110001????:	/* Branch and exchange */
+			read_1 = 4'hx;
+		32'b????000??0??????????00001??1????:	/* Halfword transfer - register offset */
+			read_1 = insn[3:0];
+		32'b????000??1??????????00001??1????:	/* Halfword transfer - register offset */
+			read_1 = insn[3:0];
+		32'b????011????????????????????1????:	/* Undefined. I hate ARM */
+			read_1 = 4'hx;
+		32'b????01??????????????????????????:	/* Single data transfer */
+			read_1 = insn[3:0];   /* Rm */
+		32'b????100?????????????????????????,	/* Block data transfer */
+		32'b????101?????????????????????????,	/* Branch */
+		32'b????110?????????????????????????,	/* Coprocessor data transfer */
+		32'b????1110???????????????????0????,	/* Coprocessor data op */
+		32'b????1110???????????????????1????,	/* Coprocessor register transfer */
+		32'b????1111????????????????????????:	/* SWI */
+			read_1 = 4'hx;
+		default:
+			read_1 = 4'hx;
+		endcase
+	
+	always @(*)
+		casez (insn)
+		32'b????000000??????????????1001????:	/* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
 			read_2 = insn[11:8];  /* Rs */
+//		32'b????00001???????????????1001????:	/* Multiply long */
+//			read_2 = 4'b0;       /* anyus */
+		32'b????00010?001111????000000000000,	/* MRS (Transfer PSR to register) */
+		32'b????00010?101001111100000000????,	/* MSR (Transfer register to PSR) */
+		32'b????00?10?1010001111????????????:	/* MSR (Transfer register or immediate to PSR, flag bits only) */
+			read_2 = 4'hx;
+		32'b????00??????????????????????????:	/* ALU */
+			read_2 = insn[11:8];  /* Rs for shift */
+		32'b????00010?00????????00001001????,	/* Atomic swap */
+		32'b????000100101111111111110001????,	/* Branch and exchange */
+		32'b????000??0??????????00001??1????,	/* Halfword transfer - register offset */
+		32'b????000??1??????????00001??1????,	/* Halfword transfer - register offset */
+		32'b????011????????????????????1????,	/* Undefined. I hate ARM */
+		32'b????01??????????????????????????,	/* Single data transfer */
+		32'b????100?????????????????????????,	/* Block data transfer */
+		32'b????101?????????????????????????,	/* Branch */
+		32'b????110?????????????????????????,	/* Coprocessor data transfer */
+		32'b????1110???????????????????0????,	/* Coprocessor data op */
+		32'b????1110???????????????????1????,	/* Coprocessor register transfer */
+		32'b????1111????????????????????????:	/* SWI */
+			read_2 = 4'hx;
+		default:
+			read_2 = 4'hx;
+		endcase
+
+	always @ (*) begin
+		op1_res = 32'hxxxxxxxx;
+		cpsr = 32'hxxxxxxxx;
+		casez (insn)
+		32'b????000000??????????????1001????: begin /* Multiply */
 			op1_res = regs1;
 			cpsr = incpsr;
 		end
-/*
-		32'b????00001???????????????1001????: begin * Multiply long *
-			read_0 = insn[11:8]; * Rn *
-			read_1 = insn[3:0];  * Rm *
-			read_2 = 4'b0;       * anyus *
-			op1_res = regs1;
-		end
-*/
+//		32'b????00001???????????????1001????: begin /* Multiply long */
+//			op1_res = regs1;
+//		end
 		32'b????00010?001111????000000000000: begin /* MRS (Transfer PSR to register) */
 			cpsr = incpsr;
 		end
@@ -90,9 +186,6 @@ module Decode(
 			cpsr = incpsr;
                 end
 		32'b????00??????????????????????????: begin /* ALU */
-			read_0 = insn[19:16]; /* Rn */
-			read_1 = insn[3:0];   /* Rm */
-			read_2 = insn[11:8];  /* Rs for shift */
 			if(insn[25]) begin     /* the constant case */
 				cpsr = incpsr;
 				op1_res = ({24'b0, insn[7:0]} >> {insn[11:8], 1'b0}) | ({24'b0, insn[7:0]} << (5'b0 - {insn[11:8], 1'b0}));
@@ -102,25 +195,16 @@ module Decode(
 			end
 		end
 		32'b????00010?00????????00001001????: begin /* Atomic swap */
-			read_0 = insn[19:16]; /* Rn */
-			read_1 = insn[3:0];   /* Rm */
-			read_2 = 4'b0;        /* anyus */
 			op1_res = regs1;
 		end
 		32'b????000100101111111111110001????: begin /* Branch and exchange */
-			read_0 = insn[3:0];   /* Rn */
 			cpsr = incpsr;
 		end
 		32'b????000??0??????????00001??1????: begin /* Halfword transfer - register offset */
-			read_0 = insn[19:16];
-			read_1 = insn[3:0];
-			read_2 = 4'b0;
 			op1_res = regs1;
 			cpsr = incpsr;
 		end
 		32'b????000??1??????????00001??1????: begin /* Halfword transfer - immediate offset */
-			read_0 = insn[19:16];
-			read_1 = insn[3:0];
 			op1_res = {24'b0, insn[11:8], insn[3:0]};
 			cpsr = incpsr;
 		end
@@ -128,8 +212,6 @@ module Decode(
 			/* eat shit */
 		end
 		32'b????01??????????????????????????: begin /* Single data transfer */
-			read_0 = insn[19:16]; /* Rn */
-			read_1 = insn[3:0];   /* Rm */
 			if(insn[25]) begin
 				op1_res = {20'b0, insn[11:0]};
 				cpsr = incpsr;
@@ -139,7 +221,6 @@ module Decode(
 			end
 		end
 		32'b????100?????????????????????????: begin /* Block data transfer */
-			read_0 = insn[19:16];
 			op1_res = {16'b0, insn[15:0]};
 			cpsr = incpsr;
 		end
@@ -148,7 +229,6 @@ module Decode(
 			cpsr = incpsr;
 		end
 		32'b????110?????????????????????????: begin /* Coprocessor data transfer */
-			read_0 = insn[19:16];
 			op1_res = {24'b0, insn[7:0]};
 			cpsr = incpsr;
 		end