From a7476505a8dfdeb1fe5c6732d4f0826ccfba4ac5 Mon Sep 17 00:00:00 2001
From: cuz <cuz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Fri, 26 Aug 2005 12:46:44 +0000
Subject: [PATCH] Added the "none" CPU.

git-svn-id: svn://svn.cc65.org/cc65/trunk@3592 b7a2c559-68d2-44c3-8de9-860c34a00d81
---
 src/ca65/instr.c         | 16 ++++++++++++++++
 src/ca65/instr.h         | 36 ++++++++++++++++++------------------
 src/ca65/macpack/cpu.mac | 18 ++++++++++--------
 3 files changed, 44 insertions(+), 26 deletions(-)

diff --git a/src/ca65/instr.c b/src/ca65/instr.c
index 1cfc5ba30..710944e49 100644
--- a/src/ca65/instr.c
+++ b/src/ca65/instr.c
@@ -83,6 +83,13 @@ static void PutSweet16Branch (const InsDesc* Ins);
 
 
 
+/* Empty instruction table */
+static const struct {
+    unsigned Count;
+} InsTabNone = {
+    0
+};
+
 /* Instruction table for the 6502 */
 #define INS_COUNT_6502         	56
 static const struct {
@@ -575,6 +582,7 @@ static const struct {
 
 /* An array with instruction tables */
 static const InsTable* InsTabs[CPU_COUNT] = {
+    (const InsTable*) &InsTabNone,
     (const InsTable*) &InsTab6502,
     (const InsTable*) &InsTab6502X,
     (const InsTable*) &InsTab65SC02,
@@ -1136,6 +1144,14 @@ int FindInstruction (const char* Ident)
     const InsDesc* ID;
     char Key[sizeof (ID->Mnemonic)];
 
+    /* Shortcut for the "none" CPU: If there are no instructions to search
+     * for, bail out early.
+     */
+    if (InsTab->Count == 0) {
+        /* Not found */
+        return -1;
+    }
+
     /* Make a copy, and uppercase that copy */
     I = 0;
     while (Ident[I] != '\0') {
diff --git a/src/ca65/instr.h b/src/ca65/instr.h
index 4fa99090d..b9706ce84 100644
--- a/src/ca65/instr.h
+++ b/src/ca65/instr.h
@@ -57,32 +57,32 @@
  * When assembling for the 6502 or 65C02, all addressing modes that are not
  * available on these CPUs are removed before doing any checks.
  */
-#define AM65_IMPLICIT    	       	0x00000003UL
-#define AM65_ACCU	       	       	0x00000002UL
+#define AM65_IMPLICIT          	0x00000003UL
+#define AM65_ACCU	       	0x00000002UL
 #define AM65_DIR      	       	0x00000004UL
 #define AM65_ABS     	       	0x00000008UL
 #define AM65_ABS_LONG  		0x00000010UL
 #define AM65_DIR_X 	  	0x00000020UL
 #define AM65_ABS_X            	0x00000040UL
 #define AM65_ABS_LONG_X		0x00000080UL
-#define AM65_DIR_Y               	0x00000100UL
-#define AM65_ABS_Y               	0x00000200UL
-#define AM65_DIR_IND             	0x00000400UL
-#define AM65_ABS_IND     	       	0x00000800UL
-#define AM65_DIR_IND_LONG        	0x00001000UL
-#define AM65_DIR_IND_Y           	0x00002000UL
-#define AM65_DIR_IND_LONG_Y      	0x00004000UL
-#define AM65_DIR_X_IND           	0x00008000UL
-#define AM65_ABS_X_IND           	0x00010000UL
-#define AM65_REL                 	0x00020000UL
-#define AM65_REL_LONG            	0x00040000UL
-#define AM65_STACK_REL           	0x00080000UL
-#define AM65_STACK_REL_IND_Y     	0x00100000UL
+#define AM65_DIR_Y              0x00000100UL
+#define AM65_ABS_Y              0x00000200UL
+#define AM65_DIR_IND            0x00000400UL
+#define AM65_ABS_IND     	0x00000800UL
+#define AM65_DIR_IND_LONG       0x00001000UL
+#define AM65_DIR_IND_Y          0x00002000UL
+#define AM65_DIR_IND_LONG_Y     0x00004000UL
+#define AM65_DIR_X_IND          0x00008000UL
+#define AM65_ABS_X_IND          0x00010000UL
+#define AM65_REL                0x00020000UL
+#define AM65_REL_LONG           0x00040000UL
+#define AM65_STACK_REL          0x00080000UL
+#define AM65_STACK_REL_IND_Y    0x00100000UL
 #define AM65_IMM_ACCU	       	0x00200000UL
 #define AM65_IMM_INDEX	       	0x00400000UL
-#define AM65_IMM_IMPLICIT	       	0x00800000UL
-#define AM65_IMM                 	(AM65_IMM_ACCU | AM65_IMM_INDEX | AM65_IMM_IMPLICIT)
-#define AM65_BLOCKMOVE           	0x01000000UL
+#define AM65_IMM_IMPLICIT	0x00800000UL
+#define AM65_IMM                (AM65_IMM_ACCU | AM65_IMM_INDEX | AM65_IMM_IMPLICIT)
+#define AM65_BLOCKMOVE          0x01000000UL
 
 /* Bitmask for all ZP operations that have correspondent ABS ops */
 #define AM65_SET_ZP 	(AM65_DIR | AM65_DIR_X | AM65_DIR_Y | AM65_DIR_IND | AM65_DIR_X_IND)
diff --git a/src/ca65/macpack/cpu.mac b/src/ca65/macpack/cpu.mac
index f7698954a..29abd5b69 100644
--- a/src/ca65/macpack/cpu.mac
+++ b/src/ca65/macpack/cpu.mac
@@ -1,14 +1,16 @@
 
 ; CPU bitmask constants
-CPU_ISET_6502      = $01
-CPU_ISET_6502X     = $02
-CPU_ISET_65SC02    = $04
-CPU_ISET_65C02     = $08
-CPU_ISET_65816     = $10
-CPU_ISET_SUNPLUS   = $20
-CPU_ISET_SWEET16   = $40
+CPU_ISET_NONE      = $01
+CPU_ISET_6502      = $02
+CPU_ISET_6502X     = $04
+CPU_ISET_65SC02    = $08
+CPU_ISET_65C02     = $10
+CPU_ISET_65816     = $20
+CPU_ISET_SUNPLUS   = $40
+CPU_ISET_SWEET16   = $80
 
-; CPU capabilities
+; CPU capabilities     
+CPU_NONE           = CPU_ISET_NONE
 CPU_6502           = CPU_ISET_6502
 CPU_6502X          = CPU_ISET_6502|CPU_ISET_6502X
 CPU_65SC02         = CPU_ISET_6502|CPU_ISET_65SC02
-- 
2.39.5