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83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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** cpu.h 650x/651x cpu-description header-file
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** (c) in 2002,2008,2009 by Frank Wille
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*/
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#define BIGENDIAN 0
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#define LITTLEENDIAN 1
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#define VASM_CPU_650X 1
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/* maximum number of operands for one mnemonic */
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#define MAX_OPERANDS 2
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/* maximum number of mnemonic-qualifiers per mnemonic */
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#define MAX_QUALIFIERS 0
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/* data type to represent a target-address */
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typedef int16_t taddr;
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/* minimum instruction alignment */
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#define INST_ALIGN 1
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/* default alignment for n-bit data */
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#define DATA_ALIGN(n) 1
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/* operand class for n-bit data definitions */
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#define DATA_OPERAND(n) DATAOP
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/* returns true when instruction is valid for selected cpu */
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#define MNEMONIC_VALID(i) cpu_available(i)
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/* we define two additional unary operations, '<' and '>' */
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int ext_unary_eval(int,taddr,taddr *,int);
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int ext_find_base(symbol **,expr *,section *,taddr);
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#define LOBYTE (LAST_EXP_TYPE+1)
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#define HIBYTE (LAST_EXP_TYPE+2)
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#define EXT_UNARY_NAME(s) (*s=='<'||*s=='>')
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#define EXT_UNARY_TYPE(s) (*s=='<'?LOBYTE:HIBYTE)
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#define EXT_UNARY_EVAL(t,v,r,c) ext_unary_eval(t,v,r,c)
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#define EXT_FIND_BASE(b,e,s,p) ext_find_base(b,e,s,p)
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/* type to store each operand */
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typedef struct {
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int type;
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expr *value;
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} operand;
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/* additional mnemonic data */
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typedef struct {
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unsigned char opcode;
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unsigned char zp_opcode; /* !=0 means optimization to zero page allowed */
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uint16_t available;
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} mnemonic_extension;
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/* available */
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#define M6502 1 /* standard 6502 instruction set */
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#define ILL 2 /* illegal 6502 instructions */
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#define DTV 4 /* C64 DTV instruction set extension */
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/* adressing modes */
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#define IMPLIED 0
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#define ABS 1 /* $1234 */
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#define ABSX 2 /* $1234,X */
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#define ABSY 3 /* $1234,Y */
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#define INDIR 4 /* ($1234) - JMP only */
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#define INDX 5 /* ($12,X) */
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#define INDY 6 /* ($12),Y */
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#define ZPAGE 7 /* add ZPAGE-ABS to optimize ABS/ABSX/ABSY */
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#define ZPAGEX 8
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#define ZPAGEY 9
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#define RELJMP 10 /* B!cc/JMP construction */
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#define REL 11 /* $1234 - relative branch */
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#define IMMED 12 /* #$12 */
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#define DATAOP 13 /* data operand */
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#define ACCU 14 /* A */
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#define DUMX 15 /* dummy X as 'second' operand */
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#define DUMY 16 /* dummy Y as 'second' operand */
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/* exported by cpu.c */
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int cpu_available(int);
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