git.sur5r.net Git - cc65/blob - src/cc65/opcodes.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 opcodes.h                                 */
   4 /*                                                                           */
   5 /*                  Opcode and addressing mode definitions                   */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2001      Ullrich von Bassewitz                                       */
  10 /*               Wacholderweg 14                                             */
  11 /*               D-70597 Stuttgart                                           */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #ifndef OPCODES_H
  37 #define OPCODES_H
  38
  39
  40
  41 /* common */
  42 #include "inline.h"
  43
  44
  45
  46 /*****************************************************************************/
  47 /*                                   Data                                    */
  48 /*****************************************************************************/
  49
  50
  51
  52 /* Definitions for the possible opcodes */
  53 typedef enum {
  54
  55     /* 65XX opcodes */
  56     OP65_ADC,
  57     OP65_AND,
  58     OP65_ASL,
  59     OP65_BCC,
  60     OP65_BCS,
  61     OP65_BEQ,
  62     OP65_BIT,
  63     OP65_BMI,
  64     OP65_BNE,
  65     OP65_BPL,
  66     OP65_BRA,
  67     OP65_BRK,
  68     OP65_BVC,
  69     OP65_BVS,
  70     OP65_CLC,
  71     OP65_CLD,
  72     OP65_CLI,
  73     OP65_CLV,
  74     OP65_CMP,
  75     OP65_CPX,
  76     OP65_CPY,
  77     OP65_DEA,
  78     OP65_DEC,
  79     OP65_DEX,
  80     OP65_DEY,
  81     OP65_EOR,
  82     OP65_INA,
  83     OP65_INC,
  84     OP65_INX,
  85     OP65_INY,
  86     OP65_JCC,
  87     OP65_JCS,
  88     OP65_JEQ,
  89     OP65_JMI,
  90     OP65_JMP,
  91     OP65_JNE,
  92     OP65_JPL,
  93     OP65_JSR,
  94     OP65_JVC,
  95     OP65_JVS,
  96     OP65_LDA,
  97     OP65_LDX,
  98     OP65_LDY,
  99     OP65_LSR,
 100     OP65_NOP,
 101     OP65_ORA,
 102     OP65_PHA,
 103     OP65_PHP,
 104     OP65_PHX,
 105     OP65_PHY,
 106     OP65_PLA,
 107     OP65_PLP,
 108     OP65_PLX,
 109     OP65_PLY,
 110     OP65_ROL,
 111     OP65_ROR,
 112     OP65_RTI,
 113     OP65_RTS,
 114     OP65_SBC,
 115     OP65_SEC,
 116     OP65_SED,
 117     OP65_SEI,
 118     OP65_STA,
 119     OP65_STX,
 120     OP65_STY,
 121     OP65_TAX,
 122     OP65_TAY,
 123     OP65_TRB,
 124     OP65_TSB,
 125     OP65_TSX,
 126     OP65_TXA,
 127     OP65_TXS,
 128     OP65_TYA,
 129     OPCODE_COUNT                /* Number of opcodes available */
 130 } opc_t;
 131
 132 /* Addressing modes (bitmapped). */
 133 typedef enum {
 134     AM65_IMP,                   /* implicit */
 135     AM65_ACC,                   /* accumulator */
 136     AM65_IMM,                   /* immidiate */
 137     AM65_ZP,                    /* zeropage */
 138     AM65_ZPX,                   /* zeropage,X */
 139     AM65_ABS,                   /* absolute */
 140     AM65_ABSX,                  /* absolute,X */
 141     AM65_ABSY,                  /* absolute,Y */
 142     AM65_ZPX_IND,               /* (zeropage,x) */
 143     AM65_ZP_INDY,               /* (zeropage),y */
 144     AM65_ZP_IND,                /* (zeropage) */
 145     AM65_BRA                    /* branch */
 146 } am_t;
 147
 148 /* Branch conditions */
 149 typedef enum {
 150     BC_CC,
 151     BC_CS,
 152     BC_EQ,
 153     BC_MI,
 154     BC_NE,
 155     BC_PL,
 156     BC_VC,
 157     BC_VS
 158 } bc_t;
 159
 160 /* Opcode info */
 161 #define OF_NONE 0x0000U                 /* No additional information */
 162 #define OF_UBRA 0x0001U                 /* Unconditional branch */
 163 #define OF_CBRA 0x0002U                 /* Conditional branch */
 164 #define OF_ZBRA 0x0004U                 /* Branch on zero flag condition */
 165 #define OF_FBRA 0x0008U                 /* Branch on cond set by a load */
 166 #define OF_LBRA 0x0010U                 /* Jump/branch is long */
 167 #define OF_RET  0x0020U                 /* Return from function */
 168 #define OF_LOAD 0x0040U                 /* Register load */
 169 #define OF_XFR  0x0080U                 /* Transfer instruction */
 170 #define OF_CALL 0x0100U                 /* A subroutine call */
 171
 172 /* Combined infos */
 173 #define OF_BRA  (OF_UBRA | OF_CBRA)     /* Operation is a jump/branch */
 174 #define OF_DEAD (OF_UBRA | OF_RET)      /* Dead end - no exec behind this point */
 175
 176 /* Opcode description */
 177 typedef struct {
 178     opc_t           OPC;                /* Opcode */
 179     char            Mnemo[8];           /* Mnemonic */
 180     unsigned char   Size;               /* Size, 0 = check addressing mode */
 181     unsigned char   Use;                /* Registers used by this insn */
 182     unsigned char   Chg;                /* Registers changed by this insn */
 183     unsigned short  Info;               /* Additional information */
 184 } OPCDesc;
 185
 186 /* Opcode description table */
 187 extern const OPCDesc OPCTable[OPCODE_COUNT];
 188
 189
 190
 191 /*****************************************************************************/
 192 /*                                   Code                                    */
 193 /*****************************************************************************/
 194
 195
 196
 197 const OPCDesc* FindOpcode (const char* OPC);
 198 /* Find the given opcode and return the opcode description. If the opcode was
 199  * not found, NULL is returned.
 200  */
 201
 202 unsigned GetInsnSize (opc_t OPC, am_t AM);
 203 /* Return the size of the given instruction */
 204
 205 #if defined(HAVE_INLINE)
 206 INLINE const OPCDesc* GetOPCDesc (opc_t OPC)
 207 /* Get an opcode description */
 208 {
 209     /* Return the description */
 210     return &OPCTable [OPC];
 211 }
 212 #else
 213 #  define GetOPCDesc(OPC)       (&OPCTable [(OPC)])
 214 #endif
 215
 216 #if defined(HAVE_INLINE)
 217 INLINE unsigned GetOPCInfo (opc_t OPC)
 218 /* Get opcode information */
 219 {
 220     /* Return the info */
 221     return OPCTable[OPC].Info;
 222 }
 223 #else
 224 #  define GetOPCInfo(OPC)       (OPCTable[(OPC)].Info)
 225 #endif
 226
 227 unsigned char GetAMUseInfo (am_t AM);
 228 /* Get usage info for the given addressing mode (addressing modes that use
 229  * index registers return REG_r info for these registers).
 230  */
 231
 232 opc_t GetInverseBranch (opc_t OPC);
 233 /* Return a branch that reverse the condition of the branch given in OPC */
 234
 235 opc_t MakeShortBranch (opc_t OPC);
 236 /* Return the short version of the given branch. If the branch is already
 237  * a short branch, return the opcode unchanged.
 238  */
 239
 240 opc_t MakeLongBranch (opc_t OPC);
 241 /* Return the long version of the given branch. If the branch is already
 242  * a long branch, return the opcode unchanged.
 243  */
 244
 245 bc_t GetBranchCond (opc_t OPC);
 246 /* Get the condition for the conditional branch in OPC */
 247
 248 bc_t GetInverseCond (bc_t BC);
 249 /* Return the inverse condition of the given one */
 250
 251
 252
 253 /* End of opcodes.h */
 254 #endif
 255
 256
 257