99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/*
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* Motorola 68020 dependent C declarations
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*/
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#define low3(z) ((short)(z) & 07)
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#define low4(z) ((short)(z) & 017)
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#define low5(z) ((short)(z) & 037)
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#define low6(z) ((short)(z) & 077)
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#define fit3(z) ((((z)-1) & ~07) == 0)
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#define fit4(z) (((z) & ~017) == 0)
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#define fit5(z) (((z) & ~037) == 0)
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#define fit6(z) (((z) & ~077) == 0)
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#define fit8(z) (((z) & ~0xFF) == 0)
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#define fit16(z) (((z) & ~0xFFFF) == 0)
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#define SIZE_B 0000
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#define SIZE_W 0100
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#define SIZE_L 0200
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#define SIZE_NON 0300
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#define SIZE_DEF SIZE_W
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extern int mrg_1,mrg_2; /* Mode and ReGister */
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extern short ffew_1, ffew_2; /* Full Format Extension Word */
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extern expr_t bd_1,bd_2,od_1,od_2; /* base and outer displacements */
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#ifndef ASLD
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extern valu_t bd_rel1,bd_rel2,od_rel1,od_rel2;
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#endif
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#ifdef RELOCATION
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#ifdef ASLD
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#define T_EMIT2(a,b,c,d) t_emit2(a,b,c,0)
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#define T_EMIT4(a,b,c,d) t_emit4(a,b,c,0)
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#else ALSD
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#define T_EMIT2(a,b,c,d) t_emit2(a,b,c,d)
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#define T_EMIT4(a,b,c,d) t_emit4(a,b,c,d)
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#endif ASLD
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#else
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#define T_EMIT2(a,b,c,d) t_emit2(a)
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#define T_EMIT4(a,b,c,d) t_emit4(a)
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#endif
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struct instr_t {
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short i_word; /* word to be emitted */
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#ifdef RELOCATION
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short i_relotype;
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int i_reloinfo;
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valu_t i_relonami;
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#endif
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};
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typedef struct instr_t instr_t;
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instr_t instr[30]; /* temporary area for instructions */
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instr_t *instrp; /* index into instr[] */
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int dot_offset;
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/* flags used when reading effective addresses */
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#define INDEX 0300
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#define PRE_INDEX 0100
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#define POST_INDEX 0200
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#define DBL_INDEX 0300
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#define PC_MODE 0400
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/* addressing mode bits */
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#define DTA 0x01
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#define MEM 0x02
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#define CTR 0x04
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#define ALT 0x08
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#define FITB 0x10
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#define FITW 0x20
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#define PUTW 0x40
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#define PUTL 0x80
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#ifndef extern
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extern short eamode[];
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#else
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short eamode[] = {
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/* 00A */ DTA |ALT,
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/* 01A */ ALT,
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/* 02A */ DTA|MEM|CTR|ALT,
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/* 03A */ DTA|MEM |ALT,
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/* 04A */ DTA|MEM |ALT,
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/* 05A */ DTA|MEM|CTR|ALT|FITW|PUTW, /* if relocation wanted, use 06A */
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/* 06A */ DTA|MEM|CTR|ALT |PUTW, /* relocation handled by ea_1() */
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/* 07x */ 0,
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/* 070 */ DTA|MEM|CTR|ALT|FITW|PUTW | (RELO2)<<8,
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/* 071 */ DTA|MEM|CTR|ALT |PUTL | (RELO4)<<8,
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/* 072 */ DTA|MEM|CTR |FITW|PUTW, /* if relocation wanted, use 073 */
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/* 073 */ DTA|MEM|CTR |PUTW, /* relocation handled by ea_1() */
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/* 074x */ 0,
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/* 074B */ DTA|MEM |FITB|PUTW | (RELO1)<<8,
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/* 074W */ DTA|MEM |FITW|PUTW | (RELO2)<<8,
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/* 074L */ DTA|MEM |PUTL | (RELO4)<<8,
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};
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/* RELO2 had to go with mode 070, because the assembly
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* language programmer can use addresses like
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* '(expression).w', which still have to be relocatable.
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*/
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#endif
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