68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* (c) copyright 1990 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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#define RCSID1 "$Header$"
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/*
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* VAX-11 Machine dependent C declarations
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*/
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/* Addressing modes */
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#define REG_MODE 5
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#define REGDEF_MODE 6
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#define AI_MODE 8
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#define AI_DEF_MODE 9
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#define AD_MODE 7
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#define DISPLB_MODE 10
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#define DISPLW_MODE 12
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#define DISPLL_MODE 14
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#define DISPLB_DEF_MODE 11
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#define DISPLW_DEF_MODE 13
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#define DISPLL_DEF_MODE 15
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#define INDEX_MODE 4
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#define DISPL 16 /* not an addressing mode; used for branch
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displacement addressing
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*/
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#define ABS 17 /* absolute mode (only for internal use) */
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#define IMM 18 /* immediate mode (only for internal use) */
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#define REL 19 /* relative mode (only for internal use) */
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#define REL_DEF 20 /* relative deferred mode (only for internal
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use)
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*/
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/* Some mnemonics used in mach5.c */
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#define PC 15 /* program counter */
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#define BRB 0x11 /* opcode of branch with byte offset */
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#define BRW 0x31 /* opcode of branch with word offset */
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#define JMP 0x17 /* opcode of jmp instruction */
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/* Test if a constant is suitable for literal mode */
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#define literal(z) (((z) & ~(int)0x3f) == 0)
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/* Declarations for operands */
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struct operand {
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expr_t exp;
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int mode; /* addressing mode */
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int reg; /* register used in addressing mode */
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int relo; /* index in relocation table for exp */
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int size; /* size as imposed by instruction
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-1 indicates bit-field (no immediate mode
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allowed)
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-2 indicates address (no register mode
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or immediate mode allowed)
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*/
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int index_reg; /* for indexed mode contains index reg,
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-1 if not index mode
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*/
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};
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extern struct operand opnd[6]; /* maximum number of operands of a VAX
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instruction is 6
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*/
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extern int op_ind; /* index in opng array */
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