268 lines
8.6 KiB
C
268 lines
8.6 KiB
C
/*
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* Copyright (c) 2007-2009 Dominic Morris <dom /at/ suborbital.org.uk>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* z80 backend for vasm */
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#include <stdint.h>
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#define BIGENDIAN 0
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#define LITTLEENDIAN 1
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#define VASM_CPU_Z80 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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/* maximum number of additional command-line-flags for this cpu */
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/* data type to represent a target-address */
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typedef int32_t taddr;
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typedef uint32_t utaddr;
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#define HAVE_INSTRUCTION_EXTENSION 1
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typedef struct {
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int altd;
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int ioi;
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int ioe;
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} instruction_ext;
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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) OP_DATA
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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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/* Z80 allows ':' as a statement delimiter in oldstyle-syntax */
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#define STATEMENT_DELIMITER ':'
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/* type to store each operand */
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typedef struct {
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int reg;
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int type;
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int flags;
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int bit;
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expr *value;
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} operand;
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#define CPU_8080 1
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#define CPU_Z80 2
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#define CPU_RCM2000 4
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#define CPU_RCM3000 8
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#define CPU_RCM4000 16
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#define CPU_Z180 32
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#define CPU_EZ80 64
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#define CPU_GB80 128
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#define CPU_RABBIT (CPU_RCM2000|CPU_RCM3000|CPU_RCM4000)
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#define CPU_ZILOG (CPU_Z80|CPU_Z180|CPU_EZ80)
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#define CPU_ALL ( CPU_ZILOG | CPU_8080 | CPU_RABBIT | CPU_GB80 )
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#define CPU_NOT8080 ( CPU_ALL ^ CPU_8080 )
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#define CPU_NOTGB80 ( CPU_ALL ^ CPU_GB80 )
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#define RCM_EMU_NONE 0
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#define RCM_EMU_INCREMENT 1 /* Move to next instruction */
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#define RCM_EMU_LIBRARY 2 /* Call a library routine */
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/* Flags for altd */
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#define F_IO 1 /* ioe/ioi valid */
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#define F_ALTD 2 /* altd valid */
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#define F_ALTDW 4 /* warn about altw use */
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#define F_ALTDWHL 8 /* Warn about HLREF use with altd */
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#define F_ALL ( F_IO|F_ALTD)
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/* additional mnemonic data */
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typedef struct {
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int mode; /* Opcode mode */
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uint32_t opcode; /* Opcode */
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unsigned char cpus;
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int modifier_flags; /* Modifier flags for altd/ioi etc */
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int rabbit2000_action; /* Action to take on a rabbit */
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int rabbit3000_action; /* Action to take on a rabbit */
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int rabbit4000_action; /* Action to take on a rabbit */
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int gb80_action; /* Action to take for a GBz80 */
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} mnemonic_extension;
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/* These values are significant - opcodes derived using them */
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#define FLAGS_NZ 0
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#define FLAGS_Z 1
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#define FLAGS_NC 2
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#define FLAGS_C 3
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#define FLAGS_PO 4
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#define FLAGS_PE 5
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#define FLAGS_P 6
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#define FLAGS_M 7
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/* These values are significant - RCM4000 flags */
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#define FLAGS_GT 0
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#define FLAGS_GTU 1
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#define FLAGS_LT 2
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#define FLAGS_V 3
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/* Theses values are significant */
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#define REG_BC 0x00
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#define REG_DE 0x01
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#define REG_HL 0x02
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#define REG_SP 0x03
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#define REG_AF 0x04
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/* These values are signifcant - opcodes are derived using them */
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#define REG_B 0x00
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#define REG_C 0x01
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#define REG_D 0x02
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#define REG_E 0x03
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#define REG_H 0x04
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#define REG_L 0x05
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#define REG_HLREF 0x06
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#define REG_A 0x07
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/* Extra ones - values from here onwards aren't significant */
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#define REG_I 0x08
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#define REG_R 0x09
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#define REG_F 0x0a
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#define REG_PORT 0x0b
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/* Rabbit extras */
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#define REG_IP 0x0c
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#define REG_XPC 0x0d
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/* Rabbit 4000 extras */
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#define REG_JK 0x0d
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#define REG_BCDE 0x0e
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#define REG_JKHL 0x0f
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/* PW...PZ should be defined in this order */
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#define REG_PW 0x10
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#define REG_PX 0x11
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#define REG_PY 0x12
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#define REG_PZ 0x13
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#define REG_SU 0x14
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#define REG_HTR 0x15
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#define REG_PLAIN 0x1f /* Mask to get the register out */
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/* Modifiers */
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#define REG_IX 0x20 /* h,l modified by ix */
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#define REG_IY 0x40 /* h,l modified by iy */
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#define REG_ALT 0x80 /* alternate registers */
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#define REG_INDEX 0x100 /* (ix + ) */
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/* Operand types */
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#define OP_NONE 0x00
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#define OP_ABS 0x01
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#define OP_ABS16 0x02
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#define OP_REG16 0x03
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#define OP_REG8 0x04
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#define OP_AF 0x05 /* af */
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#define OP_SP 0x06 /* sp */
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#define OP_HL 0x07 /* hl */
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#define OP_DE 0x08 /* de */
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#define OP_BC 0x09 /* bc */
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#define OP_JK 0x0a
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#define OP_BCDE 0x0b
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#define OP_JKHL 0x0c
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#define OP_A 0x0d /* a register */
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#define OP_R 0x0e /* r register */
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#define OP_I 0x0f /* i register */
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#define OP_F 0x10 /* f - for in f,(c) */
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#define OP_PORT 0x11
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#define OP_FLAGS 0x12 /* nz, z, nc, c, (po, pe) */
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#define OP_FLAGS_RCM 0x13 /* gt, lt, ge, le */
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#define OP_ADDR 0x14 /* (xx) - an address */
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#define OP_NUMBER 0x15 /* for bit, im, res, set, rst */
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#define OP_ADDR8 0x16
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#define OP_IP 0x17 /* ip (RCM) */
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#define OP_XPC 0x18
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#define OP_ABS24 0x19
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#define OP_ABS32 0x20
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#define OP_ADDR24 0x21
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#define OP_ADDR32 0x22
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#define OP_IX 0x23
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#define OP_IY 0x24
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#define OP_IDX32 0x25
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#define OP_SU 0x26
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#define OP_HTR 0x27
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#define OP_DATA 0x3e
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#define OP_MASK 0x3f /* Gets the basic operation out */
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/* Modifiers */
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#define OP_INDIR 0x40 /* ( x ) */
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#define OP_INDEX 0x80 /* Modifier for 8 bit operations with ixh, ixl */
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#define OP_ALT 0x100
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#define OP_OFFSET 0x200 /* Has an offset as well (always optional) - maybe from ix,iy or sp,hl (rabbit) */
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#define OP_ARITH16 0x400
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#define OP_PUSHABLE 0x800
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#define OP_STD16BIT 0x1000
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#define OP_RALT 0x2000 /* Accept an alt register on a rabbit (only used mnemonics) - except (hl) */
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#define OP_RALTHL 0x4000 /* Accept an alt (hl) register on a rabbit (only used mnemonics) */
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#define OP_OFFSA 0x8000 /* Have +a as offset */
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#define OP_OFFSHL 0x10000 /* Have +hl as offset */
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#define OP_OFFSBC 0x20000 /* Have +bc as offset */
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#define OP_OFFSDE 0x40000 /* Have +de as offset */
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#define OP_OFFSIX 0x80000 /* Have +ix as offset */
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#define OP_OFFSIY 0x100000 /* Have +iy as offset */
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/* Opcode types - we can group them together to calculate offsets etc */
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#define TYPE_NONE 0x00 /* No modifiers */
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#define TYPE_ARITH8 0x01 /* + reg1 index or + reg2 index*/
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#define TYPE_MISC8 0x02 /* + reg1 * 8 or + reg 2 * 8*/
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#define TYPE_LD8 0x03 /* + reg1 * 8 + reg 2 */
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#define TYPE_ARITH16 0x04 /* reg * 16 */
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#define TYPE_FLAGS 0x05 /* flags * 8 */
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#define TYPE_RELJUMP 0x06 /* jr/djnz/jre (flags *8 if necessary */
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#define TYPE_BIT 0x07 /* Bit setting etc */
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#define TYPE_RST 0x08 /* rst XX */
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#define TYPE_IM 0x09 /* im */
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#define TYPE_EDPREF 0x0a /* Has a 0xed prefix by default (RCM opcodes) */
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#define TYPE_IPSET 0x0b /* ipset X (RCM) */
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#define TYPE_IDX32 0x0c /* p? * 16 */
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#define TYPE_NOPREFIX 0x0d /* Don't add on an indexing prefix (RCM) */
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#define TYPE_IDX32R 0x0e /* p? * 16 + p? * 64*/
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#define TYPE_OUT_C_0 0x0f /* for out (c), number, number can only be 0 */
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